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CN112688576A - Five-level rectifier with common high-voltage direct-current bus and control strategy - Google Patents

Five-level rectifier with common high-voltage direct-current bus and control strategy Download PDF

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CN112688576A
CN112688576A CN202110033523.6A CN202110033523A CN112688576A CN 112688576 A CN112688576 A CN 112688576A CN 202110033523 A CN202110033523 A CN 202110033523A CN 112688576 A CN112688576 A CN 112688576A
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output
switching device
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CN112688576B (en
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程红
王聪
赵志浩
李瑶璞
陶艳梅
杨道宽
于龙飞
袁巍
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China University of Mining and Technology Beijing CUMTB
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Abstract

The invention discloses a five-level rectifier with a public high-voltage direct-current bus and a control strategy, and belongs to an AC/DC conversion technology and a control technology thereof. The converter provides various main power circuits for forming a pair of common high-voltage direct-current buses, greatly reduces the voltage stress of a power switch tube, and overcomes the defect that the traditional rectifier cannot generate high direct-current bus voltage due to the limitation of the voltage stress of the power switch tube. Compared with the traditional rectifier, the rectifier and the control strategy provided by the invention can realize the voltage boosting and reducing of the output side of the rectifier, can ensure the normal work in a wider power supply voltage variation range, do not need to use the isolation of a huge, heavy and complex-wiring power frequency phase-shifting transformer, greatly simplify the topology of a main power circuit, reduce the number of fully-controlled devices, improve the working efficiency of a system, have small volume, light weight and simple control, and have important application values in the fields of medium-high voltage direct current transmission, high-power medium-high voltage variable frequency speed regulation and the like.

Description

Five-level rectifier with common high-voltage direct-current bus and control strategy
Technical Field
The invention belongs to the technical field of medium-high voltage variable frequency speed regulation, and particularly relates to a five-level rectifier with a public high-voltage direct current bus and a system implementation scheme of a control strategy.
Background
In recent years, Multilevel converters (Multilevel converters) have been successfully applied in the fields of high-voltage high-power frequency conversion speed regulation, active power filtering, high-voltage direct current (HVDC) transmission, reactive power compensation of power systems and the like. The basic circuit topologies of multilevel converters can be roughly classified into a clamping type and a cell cascade type. Diode-clamped three-level medium-high voltage inverters manufactured by siemens corporation or ABB corporation and cascaded H-bridge medium-high voltage inverters manufactured by robinkon corporation or rituximab corporation, which are widely used in the industry at present, are typical representatives of the two types of products. In any of the two types of medium-high voltage frequency converters, in order to implement high-voltage power conversion by using low-voltage-resistant power electronic devices, an industrial frequency phase-shifting transformer with large volume, complex wiring and high price is required to be used at the input side of the rectifier to realize electrical isolation. This limits their use in many industrial applications.
The cascading multilevel converter without the power frequency transformer has attracted wide attention in the technical field of power electronics in recent years, and is considered to be an ideal implementation scheme of an intelligent power grid interface or a new generation medium-high voltage frequency converter which is suitable for a new energy power generation system to access and meets the distributed power generation requirement. The converter uses a high-frequency transformer to replace a power frequency phase-shifting transformer in the traditional cascade converter to realize electrical isolation, and when the converter is used for bidirectional power transmission, a cascade full-control H bridge multi-level power converter structure is adopted on a rectifying side. When the power converter is used for unidirectional power transmission, a unidirectional cascade multilevel power converter structure (comprising a cascade diode + Boost rectifying circuit, a cascade bridgeless rectifying circuit, a cascade VIENNA rectifying circuit and the like) is adopted at the rectifying side. Compared with the traditional rectifier stage of a medium-high voltage frequency converter, the implementation scheme of the rectifier stage of the converter cancels a power frequency phase-shifting transformer which is large in size, complex in wiring and high in price, so that the size, the weight and the manufacturing cost of a system are effectively reduced. However, such converters also have significant drawbacks, mainly represented by: each phase of N cascade rectifier modules can generate N groups of direct current output ends, and the direct current output ends of the N groups of rectifier modules cannot be directly connected in series to form a pair of common high-voltage direct current output buses because the input ends are not isolated, so that the N groups of rectifier modules cannot be directly used for high-voltage direct current transmission and cannot be directly connected with a multi-level inverter circuit to be used for medium-high voltage frequency conversion speed regulation. In order to realize a common high-voltage direct-current output bus or realize flexible control of N groups of rectified output direct-current voltages, N groups of cascaded rectification modules are necessarily connected with N high-frequency isolation DC-DC conversion modules in sequence, so that the complexity of the topological structure and the control mode of the whole system is increased, and the working efficiency is reduced.
Disclosure of Invention
The invention aims to overcome the defects and provide a five-level unit power factor rectifier implementation scheme with a public high-voltage direct-current bus, compared with the rectifier stage of the traditional high-voltage frequency converter, on one hand, the five-level rectifier provided by the invention can realize the lifting function of the direct-current voltage at the output side, solves the problem that the power factor correction link of the traditional rectifier can only normally work in a boosting state, realizes that the system output direct-current voltage always works at a reasonable numerical value meeting the requirement on the occasion with a large power supply voltage change range, and greatly improves the reliability and the anti-jamming capability of the system; on the other hand, a power frequency phase-shifting transformer is not needed to be used at the input end, high-power unit power factor rectification conversion under high voltage can be completed by using a low-voltage-withstanding power switch tube, and compared with a multi-level converter without a power frequency transformer, the five-level rectifier provided by the invention can form a pair of common high-voltage direct-current buses at the direct-current side, and can flexibly realize balance control on the capacitance voltage at the output side.
In order to achieve the above object, the present invention provides a five-level rectifier with a common high-voltage dc bus, comprising a main power circuit, wherein the main power circuit comprises a high-frequency filter, a single-phase diode rectifier bridge, two boost inductors L1、L2And a first modular unit (a), characterized in that: the first module unit (A) comprises four switching devices S1、S2、S3、S4Four fast recovery diodes D1、D2、D3、D4Two common inductors L3、L4Two DC capacitors C1、C2Four output DC capacitors C3、C4、C5、C6And four load resistors R1、R2、R3、R4Said switching device S1And said dc capacitor C1Is connected to the DC capacitor C1And the other end of the diode and the fast recovery diode D1Is connected to the anode of the fast recovery diode D1And the output direct current capacitor C connected in parallel3And the load resistance R1Is connected to the first terminal (m), said switching device S1And said switching device S2And said fast recovery diode D2Is connected to the anode of the fast recovery diode D2And the common inductor L3And the output DC capacitor C connected in parallel4And the load resistance R2Is connected to the first terminal (m), the common inductance L3And the other end of the diode and the fast recovery diode D1Is connected with the anode of the output direct current capacitor C in parallel connection3And the load resistance R1With said output dc capacitor C connected in parallel to a second terminal (n) of4And the load resistance R2Is connected to the first terminal (m), said switching device S2And said switching device S3To (1) aA terminal (a) and the output DC capacitor C connected in parallel5And the load resistance R3Is connected to the first terminal (m), the output DC capacitor C is connected in parallel4And the load resistance R2With said output dc capacitor C connected in parallel to a second terminal (n) of5And the load resistance R3Is connected to the first terminal (m), said switching device S3Second connection of said fast recovery diode D3And said switching device S4And said fast recovery diode D3The cathode is connected with the anode and the output direct current capacitor C is connected in parallel5And the load resistance R3And said output dc capacitor C connected in parallel6And the load resistance R4Is connected to the first terminal (m), said switching device S4And said dc capacitor C2And the boost inductor L2Is connected to the other end of the voltage boosting inductor L2The other end of the DC capacitor C is connected with the negative end of the rectification output of the single-phase diode rectifier bridge, and the DC capacitor C2And the other end of the common inductor L4And the fast recovery diode D4Is connected to the cathode of the common inductor L4And the other end of the diode and the fast recovery diode D3Is connected to the anode of the fast recovery diode D4And the output direct current capacitor C connected in parallel6And the load resistance R4Is connected to the second terminal (n), said switching device S1With said boost inductor L1Is connected to the other end of the voltage boosting inductor L1The other end of the single-phase diode rectifier bridge is connected with the positive end of the rectification output of the single-phase diode rectifier bridge, and the alternating current input end of the single-phase diode rectifier bridge is connected in series with an alternating current power grid through the high-frequency filter.
In order to achieve the purpose, the three-phase parallel rectifier formed by the five-level rectifier with the common high-voltage direct-current bus comprises a three-phase main power circuit, and is characterized in that: the three-phase main power circuit comprises three high-frequency filters and threeA second modular unit (B) comprising a single-phase diode rectifier bridge, two boost inductors L1、L2And a first module unit (A) comprising four switching devices S1、S2、S3、S4Four fast recovery diodes D1、D2、D3、D4Two common inductors L3、L4Two DC capacitors C1、C2Four output DC capacitors C3、C4、C5、C6And four load resistors R1、R2、R3、R4Said switching device S1And said dc capacitor C1Is connected to the DC capacitor C1And the other end of the diode and the fast recovery diode D1Is connected to the anode of the fast recovery diode D1And the output direct current capacitor C connected in parallel3And the load resistance R1Is connected to the first terminal (m), said switching device S1And said switching device S2And said fast recovery diode D2Is connected to the anode of the fast recovery diode D2And the common inductor L3And the output DC capacitor C connected in parallel4And the load resistance R2Is connected to the first terminal (m), the common inductance L3And the other end of the diode and the fast recovery diode D1Is connected with the anode of the output direct current capacitor C in parallel connection3And the load resistance R1With said output dc capacitor C connected in parallel to a second terminal (n) of4And the load resistance R2Is connected to the first terminal (m), said switching device S2And said switching device S3And the output DC capacitor C connected in parallel5And the load resistance R3Is connected to the first terminal (m), the output DC capacitor C is connected in parallel4And the load resistance R2Is connected in parallel with the second terminal (n)The output direct current capacitor C is connected5And the load resistance R3Is connected to the first terminal (m), said switching device S3And said switching device S4And said fast recovery diode D3Is connected to the cathode of the fast recovery diode D3And the output direct current capacitor C connected in parallel5And the load resistance R3And said output dc capacitor C connected in parallel6And the load resistance R4Is connected to the first terminal (m), said switching device S4And said dc capacitor C2And the boost inductor L2Is connected to the other end of the voltage boosting inductor L2The other end of the DC capacitor C is connected with the negative end of the rectification output of the single-phase diode rectifier bridge, and the DC capacitor C2And the other end of the common inductor L4And the fast recovery diode D4Is connected to the cathode of the common inductor L4And the other end of the diode and the fast recovery diode D3Is connected to the anode of the fast recovery diode D4And the output direct current capacitor C connected in parallel6And the load resistance R4Is connected to the second terminal (n), said switching device S1With said boost inductor L1Is connected to the other end of the voltage boosting inductor L1The other end of the three-phase direct current input end of the second module unit (B) is connected with the positive rectification output end (g) of the single-phase diode rectifier bridge, the negative direct current output end (h) of the second module unit (B) of each phase is connected with the positive direct current output end (g) of the second module unit (B) of each phase, the remaining 2 alternating current input ends of the second module unit (B) of each phase are connected, the first alternating current input ends of the three-phase second module unit (B) form a group of wiring ends, the second alternating current input ends of the three-phase second module unit (B) form another group of wiring ends, one group of wiring ends are connected to a common neutral point, the other group of wiring ends are respectively connected with the three high-frequency filters in series and are connected into a three-phase power.
To achieve the above objects, the present invention provides a method for producing a coal mineThe three-phase star connection rectifier formed by the five-level rectifier with the common high-voltage direct-current bus comprises a three-phase main power circuit and is characterized in that: the three-phase main power circuit comprises three high-frequency filters and three second module units (B), wherein each second module unit (B) comprises a single-phase diode rectifier bridge and two boost inductors L1、L2And a first module unit (A) comprising four switching devices S1、S2、S3、S4Four fast recovery diodes D1、D2、D3、D4Two common inductors L3、L4Two DC capacitors C1、C2Four output DC capacitors C3、C4、C5、C6And four load resistors R1、R2、R3、R4Said switching device S1And said dc capacitor C1Is connected to the DC capacitor C1And the other end of the diode and the fast recovery diode D1Is connected to the anode of the fast recovery diode D1And the output direct current capacitor C connected in parallel3And the load resistance R1Is connected to the first terminal (m), said switching device S1And said switching device S2And said fast recovery diode D2Is connected to the anode of the fast recovery diode D2And the common inductor L3And the output DC capacitor C connected in parallel4And the load resistance R2Is connected to the first terminal (m), the common inductance L3And the other end of the diode and the fast recovery diode D1Is connected with the anode of the output direct current capacitor C in parallel connection3And the load resistance R1With said output dc capacitor C connected in parallel to a second terminal (n) of4And the load resistance R2Is connected to the first terminal (m), said switching device S2And said switching device S3And the output DC capacitor connected in parallelC5And the load resistance R3Is connected to the first terminal (m), the output DC capacitor C is connected in parallel4And the load resistance R2With said output dc capacitor C connected in parallel to a second terminal (n) of5And the load resistance R3Is connected to the first terminal (m), said switching device S3And said switching device S4And said fast recovery diode D3Is connected to the cathode of the fast recovery diode D3And the output direct current capacitor C connected in parallel5And the load resistance R3And said output dc capacitor C connected in parallel6And the load resistance R4Is connected to the first terminal (m), said switching device S4And said dc capacitor C2And the boost inductor L2Is connected to the other end of the voltage boosting inductor L2The other end of the DC capacitor C is connected with the negative end of the rectification output of the single-phase diode rectifier bridge, and the DC capacitor C2And the other end of the common inductor L4And the fast recovery diode D4Is connected to the cathode of the common inductor L4And the other end of the diode and the fast recovery diode D3Is connected to the anode of the fast recovery diode D4And the output direct current capacitor C connected in parallel6And the load resistance R4Is connected to the second terminal (n), said switching device S1With said boost inductor L1Is connected to the other end of the voltage boosting inductor L1The other end of the three-phase rectifier circuit is connected with the positive end of the rectification output of the single-phase diode rectifier bridge, 2 residual alternating current input ends of the second module unit (B) of each phase are formed, the first alternating current input end of the three-phase second module unit (B) forms a group of wiring ends, the second alternating current input end of the three-phase second module unit (B) forms another group of wiring ends, one group of wiring ends are connected to a common neutral point, and the other group of wiring ends are respectively connected with the three high-frequency filters in series and connected into a three-phase power grid to form an output open star connection.
In order to achieve the purpose, the three-phase angle connection rectifier formed by the five-level rectifier with the common high-voltage direct-current bus comprises a three-phase main power circuit, and is characterized in that: the three-phase main power circuit comprises three high-frequency filters and three second module units (B), wherein each second module unit (B) comprises a single-phase diode rectifier bridge and two boost inductors L1、L2And a first module unit (A) comprising four switching devices S1、S2、S3、S4Four fast recovery diodes D1、D2、D3、D4Two common inductors L3、L4Two DC capacitors C1、C2Four output DC capacitors C3、C4、C5、C6And four load resistors R1、R2、R3、R4Said switching device S1And said dc capacitor C1Is connected to the DC capacitor C1And the other end of the diode and the fast recovery diode D1Is connected to the anode of the fast recovery diode D1And the output direct current capacitor C connected in parallel3And the load resistance R1Is connected to the first terminal (m), said switching device S1And said switching device S2And said fast recovery diode D2Is connected to the anode of the fast recovery diode D2And the common inductor L3And the output DC capacitor C connected in parallel4And the load resistance R2Is connected to the first terminal (m), the common inductance L3And the other end of the diode and the fast recovery diode D1Is connected with the anode of the output direct current capacitor C in parallel connection3And the load resistance R1With said output dc capacitor C connected in parallel to a second terminal (n) of4And the load resistance R2Is connected to the first terminal (m), said switching device S2And said switching device S3And the output DC capacitor C connected in parallel5And the load resistance R3Is connected to the first terminal (m), the output DC capacitor C is connected in parallel4And the load resistance R2With said output dc capacitor C connected in parallel to a second terminal (n) of5And the load resistance R3Is connected to the first terminal (m), said switching device S3And said switching device S4And said fast recovery diode D3Is connected to the cathode of the fast recovery diode D3And the output direct current capacitor C connected in parallel5And the load resistance R3And said output dc capacitor C connected in parallel6And the load resistance R4Is connected to the first terminal (m), said switching device S4And said dc capacitor C2And the boost inductor L2Is connected to the other end of the voltage boosting inductor L2The other end of the DC capacitor C is connected with the negative end of the rectification output of the single-phase diode rectifier bridge, and the DC capacitor C2And the other end of the common inductor L4And the fast recovery diode D4Is connected to the cathode of the common inductor L4And the other end of the diode and the fast recovery diode D3Is connected to the anode of the fast recovery diode D4And the output direct current capacitor C connected in parallel6And the load resistance R4Is connected to the second terminal (n), said switching device S1With said boost inductor L1Is connected to the other end of the voltage boosting inductor L1The other end of the three-phase rectifier is connected with the positive rectification output end of the single-phase diode rectifier bridge, 2 residual alternating current input ends of the second module unit (B) of each phase are arranged, the first alternating current input end of the three-phase second module unit (B) forms a group of wiring ends, the second alternating current input end of the three-phase second module unit (B) forms another group of wiring ends, one group of wiring ends are respectively connected to the input end of a three-phase power grid through the three high-frequency filters, and the other group of wiring ends are sequentially connected to the next phase of the three-phase power gridInput terminals forming an angular connection.
In order to achieve the purpose, the three-phase double-star connection rectifier formed by the five-level rectifier with the common high-voltage direct-current bus comprises a three-phase main power circuit, and is characterized in that: the three-phase main power circuit comprises three high-frequency filters, six bridge arm inductors and three second module units (B), wherein each second module unit (B) comprises a single-phase diode rectifier bridge and two boosting inductors L1、L2And a first module unit (A) comprising four switching devices S1、S2、S3、S4Four fast recovery diodes D1、D2、D3、D4Two common inductors L3、L4Two DC capacitors C1、C2Four output DC capacitors C3、C4、C5、C6And four load resistors R1、R2、R3、R4Said switching device S1And said dc capacitor C1Is connected to the DC capacitor C1And the other end of the diode and the fast recovery diode D1Is connected to the anode of the fast recovery diode D1And the output direct current capacitor C connected in parallel3And the load resistance R1Is connected to the first terminal (m), said switching device S1And said switching device S2And said fast recovery diode D2Is connected to the anode of the fast recovery diode D2And the common inductor L3And the output DC capacitor C connected in parallel4And the load resistance R2Is connected to the first terminal (m), the common inductance L3And the other end of the diode and the fast recovery diode D1Is connected with the anode of the output direct current capacitor C in parallel connection3And the load resistance R1With said output dc capacitor C connected in parallel to a second terminal (n) of4And the load resistance R2Is connected to the first terminal (m), said switchDevice S2And said switching device S3And the output DC capacitor C connected in parallel5And the load resistance R3Is connected to the first terminal (m), the output DC capacitor C is connected in parallel4And the load resistance R2With said output dc capacitor C connected in parallel to a second terminal (n) of5And the load resistance R3Is connected to the first terminal (m), said switching device S3And said switching device S4And said fast recovery diode D3Is connected to the cathode of the fast recovery diode D3And the output direct current capacitor C connected in parallel5And the load resistance R3And said output dc capacitor C connected in parallel6And the load resistance R4Is connected to the first terminal (m), said switching device S4And said dc capacitor C2And the boost inductor L2Is connected to the other end of the voltage boosting inductor L2The other end of the DC capacitor C is connected with the negative end of the rectification output of the single-phase diode rectifier bridge, and the DC capacitor C2And the other end of the common inductor L4And the fast recovery diode D4Is connected to the cathode of the common inductor L4And the other end of the diode and the fast recovery diode D3Is connected to the anode of the fast recovery diode D4And the output direct current capacitor C connected in parallel6And the load resistance R4Is connected to the second terminal (n), said switching device S1With said boost inductor L1Is connected to the other end of the voltage boosting inductor L1The other end of the three-phase rectifier is connected with the positive end of the rectification output of the single-phase diode rectifier bridge, 2 residual alternating current input ends of the second module unit (B) of each phase are arranged, the first alternating current input end of the three-phase second module unit (B) forms a group of wiring ends, the second alternating current input end of the three-phase second module unit (B) forms another group of wiring ends, one group of wiring ends is connected to a common neutral point, and the other group of wiring ends is connected to another group of wiring endsAnd the ends of the three bridge arm inductors are respectively connected with one end of each of the three bridge arm inductors, the other ends of the two bridge arm inductors on each phase of bridge arm are respectively connected with the input end of a three-phase power grid through one of the three high-frequency filters, and meanwhile, a common neutral point in the first group of star connection and a common neutral point in the second group of star connection are respectively connected with two ends of the direct current capacitor to form double star connection.
In order to achieve the purpose, the five-level rectifier with the common high-voltage direct-current bus and the control strategy are characterized by comprising the following steps of:
(1) sampling the DC voltage at the output side of a five-level rectifier with a common high-voltage DC bus to obtain an A-phase output side DC voltage signal UAo1、UAo2、UAo3、UAo4D.c. voltage signal U at phase B output sideBo1、UBo2、UBo3、UBo4d.C phase output side DC voltage signal UCo1、UCo2、UCo3、UCo4；
(2) Calculating the average value U of the DC voltage signals of each phase output side in the step (1) by using the following formulaAo、UBo、UCo：
Figure BDA0002893238990000051
Figure BDA0002893238990000052
Figure BDA0002893238990000053
(3) Mixing U in step (2)Ao、UBo、UCoRespectively associated with a given signal U of DC voltageo *After comparison, the obtained signal is sent to a PI voltage regulator to obtain the amplitude I of the direct current signal output by the PI voltage regulatorAd *、IBd *、ICd *；
(4) The direct current voltage signal U of the A phase output side in the step (1)Ao1、UAo2、UAo3、UAo4Respectively with the average value U of the DC voltage signals at the A phase output side in the step (2)AoAfter comparison, the obtained signal is sent to a PI voltage regulator to obtain the amplitude I of the output direct current signalAd1、IAd2、IAd3、IAd4The B phase output side direct current voltage signal U in the step (1) is usedBo1、UBo2、UBo3、UBo4Respectively with the average value U of the DC voltage signals at the B phase output side in the step (2)BoAfter comparison, the obtained signal is sent to a PI voltage regulator to obtain the amplitude I of the output direct current signalBd1、IBd2、IBd3、IBd4(ii) a The C phase output side direct current voltage signal U in the step (1) is processedCo1、UCo2、UCo3、UCo4Respectively with the average value U of the DC voltage signals at the C-phase output side in the step (2)CoAfter comparison, the obtained signal is sent to a PI voltage regulator to obtain the amplitude I of the output direct current signalCd1、ICd2、ICd3、ICd4；
(5) The amplitude I of the direct current signal in the step (3) is measuredBd *Multiplying by 2, and comparing the result with the amplitude I of the DC current signal in the step (3)Ad *Adding to obtain a signal E;
(6) calculating the phase of the phase A at the time t by utilizing a phase-locked loop to obtain a signal uAtCalculating the phase u of the phase A voltage at time tAtSine value Z ofACosine value YA；
(7) The signal E in the step (5) and the phase u of the A-phase voltage in the step (6) are connectedAtSine value Z ofAMultiply, the obtained result is further multiplied by
Figure BDA0002893238990000054
Multiplying to obtain a signal F, and comparing the amplitude I of the DC signal in the step (3)Ad *Phase u of A phase voltage in step (6)AtCosine value Y ofAMultiplication of the obtained result with
Figure BDA0002893238990000055
Multiplying to obtain a signal G, and adding the signal F and the signal G to obtain a zero-sequence current injection signal Iz；
(8) Sampling three-phase power grid current to obtain an input side alternating current signal IA，IB，ICThe amplitude I of the DC current signal in the step (3) is usedAd *And the amplitude I of the direct current signal in the step (4)Ad1Adding the obtained result to the zero sequence current injection signal I in the step (7)zAdding to obtain A-phase switching device SA1Given current signal IA1 *Switching device S of phase AA1Given current signal IA1 *Multiplying the signal by a triangular carrier signal to obtain a result, and comparing the result with an A-phase input side alternating current signal IASending the signal into a comparator for comparison to obtain an A-phase switching device SA1PWM signal PWM ofA1；
(9) The amplitude I of the direct current signal in the step (3) is measuredAd *And the amplitude I of the direct current signal in the step (4)Ad2Adding the obtained result to the zero sequence current injection signal I in the step (7)zAdding to obtain A-phase switching device SA2Given current signal IA2 *Delaying the triangular carrier signal in the step (8) by 90 degrees and then switching the triangular carrier signal with the A-phase switching device SA2Given current signal IA2 *Multiplying the result by the A-phase input-side AC current signal IASending the signal into a comparator for comparison to obtain an A-phase switching device SA2PWM signal PWM ofA2；
(10) The amplitude I of the direct current signal in the step (3) is measuredAd *And the amplitude I of the direct current signal in the step (4)Ad3Adding the obtained result to the zero sequence current injection signal I in the step (7)zAdding to obtain A-phase switching device SA3Given current signal IA3 *Delaying the triangular carrier signal in the step (8) by 180 degrees and then switching the triangular carrier signal with the A-phase switching device SA3Given current signal IA3 *Multiplying the result by the AC signal at the A-phase input sideIASending the signal into a comparator for comparison to obtain an A-phase switching device SA3PWM signal PWM ofA3；
(11) The amplitude I of the direct current signal in the step (3) is measuredAd *And the amplitude I of the direct current signal in the step (4)Ad4Adding the obtained result to the zero sequence current injection signal I in the step (7)zAdding to obtain A-phase given current signal IA4 *Lagging the triangular carrier signal in the step (8) by 270 degrees and then switching the triangular carrier signal with the A-phase switching device SA4Given current signal IA4 *Multiplying the result by the A-phase input-side AC current signal IASending the signal into a comparator for comparison to obtain an A-phase switching device SA4PWM signal PWM ofA4；
(12) The amplitude I of the direct current signal in the step (3) is measuredBd *And the amplitude I of the direct current signal in the step (4)Bd1Adding the obtained result to the zero sequence current injection signal I in the step (7)zAdding to obtain a B-phase switching device SB1Given current signal IB1 *The triangular carrier signal in the step (8) is connected with a B-phase switching device SB1Given current signal IB1 *Multiplying the result by the AC signal I at the input side of phase BBSending the signals into a comparator for comparison to obtain a B-phase switching device SB1PWM signal PWM ofB1；
(13) The amplitude I of the direct current signal in the step (3) is measuredBd *And the amplitude I of the direct current signal in the step (4)Bd2Adding the obtained result to the zero sequence current injection signal I in the step (7)zAdding to obtain a B-phase switching device SB2Given current signal IB2 *Delaying the triangular carrier signal in the step (8) by 90 degrees and then switching the triangular carrier signal with a B-phase switching device SB2Given current signal IB2 *Multiplying the result by the AC signal I at the input side of phase BBSending the signals into a comparator for comparison to obtain a B-phase switching device SB2PWM signal PWM ofB2；
(14) The direct current signal in the step (3) is processedAmplitude IBd *And the amplitude I of the direct current signal in the step (4)Bd3Adding the obtained result to the zero sequence current injection signal I in the step (7)zAdding to obtain a B-phase switching device SB3Given current signal IB3 *Delaying the triangular carrier signal in the step (8) by 180 degrees and then switching the triangular carrier signal with a B-phase switching device SB3Given current signal IB3 *Multiplying the result by the AC signal I at the input side of phase BBSending the signals into a comparator for comparison to obtain a B-phase switching device SB3PWM signal PWM ofB3；
(15) The amplitude I of the direct current signal in the step (3) is measuredBd *And the amplitude I of the direct current signal in the step (4)Bd4Adding the obtained result to the zero sequence current injection signal I in the step (7)zAdding to obtain a B-phase switching device SB4Given current signal IB4 *Lagging the triangular carrier signal in the step (8) by 270 degrees and then switching the triangular carrier signal with a B-phase switching device SB4Given current signal IB4 *Multiplying the result by the AC signal I at the input side of phase BBSending the signals into a comparator for comparison to obtain a B-phase switching device SB4PWM signal PWM ofB4；
(16) The amplitude I of the direct current signal in the step (3) is measuredCd *And the amplitude I of the direct current signal in the step (4)Cd1Adding the obtained result to the zero sequence current injection signal I in the step (7)zAdding to obtain C-phase switching device SC1Given current signal IC1 *The triangular carrier signal in the step (8) is connected with a C-phase switching device SC1Given current signal IC1 *Multiplying the result by the AC signal I at the input side of C phaseCSending the voltage into a comparator for comparison to obtain a C-phase switching device SC1PWM signal PWM ofC1；
(17) The amplitude I of the direct current signal in the step (3) is measuredCd *And the amplitude I of the direct current signal in the step (4)Cd2Adding the obtained result to the zero sequence current injection signal in the step (7)IzAdding to obtain C-phase switching device SC2Given current signal IC2 *Delaying the triangular carrier signal in the step (8) by 90 degrees and then connecting the delayed triangular carrier signal with a C-phase switching device SC2Given current signal IC2 *Multiplying the result by the AC signal I at the input side of C phaseCSending the voltage into a comparator for comparison to obtain a C-phase switching device SC2PWM signal PWM ofC2；
(18) The amplitude I of the direct current signal in the step (3) is measuredCd *And the amplitude I of the direct current signal in the step (4)Cd3Adding the obtained result to the zero sequence current injection signal I in the step (7)zAdding to obtain C-phase switching device SC3Given current signal IC3 *Delaying the triangular carrier signal in the step (8) by 180 degrees and then connecting the delayed triangular carrier signal with a C-phase switching device SC3Given current signal IC3 *Multiplying the result by the AC signal I at the input side of C phaseCSending the voltage into a comparator for comparison to obtain a C-phase switching device SC3PWM signal PWM ofC3；
(19) The amplitude I of the direct current signal in the step (3) is measuredCd *And the amplitude I of the direct current signal in the step (4)Cd4Adding the obtained result to the zero sequence current injection signal I in the step (7)zAdding to obtain C-phase switching device SC4Given current signal IC4 *Lagging the triangular carrier signal in the step (8) by 270 degrees and then switching the triangular carrier signal with a C-phase switching device SC4Given current signal IC4 *Multiplying the result by the AC signal I at the input side of C phaseCSending the voltage into a comparator for comparison to obtain a C-phase switching device SC4PWM signal PWM ofC4；
(20) The driving signals of the A phase, the B phase and the C phase are sent to the corresponding switching devices, active power factor correction of the three-phase rectifier is achieved, input current can be made sinusoidal when the power supply voltage conversion range is large, and balance control over output direct current capacitor voltage is achieved.
The five-level rectifier with the public high-voltage direct-current bus and the control strategy have the advantages and positive effects that: compared with the rectifier stage of the traditional medium-high voltage frequency converter, on one hand, the five-level rectifier provided by the invention can realize the lifting function of the direct-current voltage at the output side, solves the problem that the traditional rectifier can normally work only in a boosting state, realizes that the system can still normally work when the variation range of the power supply voltage is large, and greatly improves the reliability and the anti-interference capability of the system; on the other hand, the five-level rectifier with the public high-voltage direct-current bus provided by the invention does not need to use a power frequency phase-shifting transformer at the input end, and can use a low-voltage-resistant power switch tube to finish high-power unit power factor rectification conversion under high voltage. The five-level rectifier provided by the invention can form a pair of common high-voltage direct-current buses on the direct-current side when single-phase input is carried out, can form a pair of uniform common high-voltage direct-current buses on the direct-current side when three-phase input is carried out, can form three pairs of independent common high-voltage direct-current buses on the direct-current sides output by the three-phase rectifiers respectively, and can flexibly realize balance control on the capacitor voltage on the output side of the rectifier module. The five-level rectifier main power circuit provided by the invention has the advantages of simple topological structure, high system working efficiency, small volume, light weight and low cost, and has important application value in the fields of High Voltage Direct Current (HVDC), high power electronic transformers, high power medium and high voltage alternating current-direct current-alternating current frequency converters and the like.
The invention is further described below with reference to the accompanying drawings.
Drawings
FIG. 1 is a circuit diagram of a first modular unit (A) of the five level rectifier and control strategy of the present invention with a common high voltage DC bus;
FIG. 2 is a circuit diagram of a second modular unit (B) of the five level rectifier and control strategy of the present invention with a common high voltage DC bus;
FIG. 3 is a circuit diagram of a five level rectifier with a common high voltage DC bus and a three phase parallel rectifier control strategy according to the present invention;
FIG. 4 is a circuit diagram of a five-level rectifier with a common high voltage DC bus and a three-phase star-connected rectifier with a control strategy according to the present invention;
FIG. 5 is a circuit diagram of a five level rectifier with a common high voltage DC bus and a three phase angle rectifier with control strategy according to the present invention;
FIG. 6 is a circuit diagram of a three-phase dual-star rectifier with a five-level rectifier and control strategy for a common high voltage DC bus according to the present invention;
FIG. 7 is an A-phase control strategy diagram of a five-level rectifier and control strategy with a common high voltage DC bus according to the present invention;
FIG. 8 is a B-phase control strategy diagram of a five-level rectifier and control strategy with a common high voltage DC bus according to the present invention;
FIG. 9 is a schematic diagram of a C-phase control strategy for a five-level rectifier and control strategy with a common high voltage DC bus according to the present invention;
FIG. 10 is a three phase input current waveform for a three phase parallel rectifier formed by a five level rectifier having a common high voltage DC bus according to the present invention;
FIG. 11 is a graph of four DC capacitor voltage waveforms and the total output DC voltage waveform of a three phase parallel rectifier formed by a five level rectifier with a common high voltage DC bus according to the present invention;
fig. 12 is an input side five level voltage waveform of a three phase parallel rectifier formed by a five level rectifier with a common high voltage dc bus according to the present invention.
Best mode for carrying out the invention
The embodiments and the working principle of the present invention will be further described with reference to the accompanying drawings:
referring to fig. 1 and 2, a five-level rectifier with a common high voltage dc bus comprises a main power circuit including a high frequency filter, a single phase diode rectifier bridge, two boost inductors L1、L2And a first module unit (A) including four switching devices S1、S2、S3、S4Four fast recovery diodes D1、D2、D3、D4Two common inductors L3、L4Two DC capacitors C1、C2Four outputsDC capacitor C3、C4、C5、C6And four load resistors R1、R2、R3、R4Switching device S1First terminal (a) of and a dc capacitor C1Is connected to a DC capacitor C1And the other end of the diode D and the fast recovery diode D1Is connected with the anode of the fast recovery diode D1And an output DC capacitor C connected in parallel3And a load resistance R1Is connected to the first terminal (m), the switching device S1And the second terminal (b) of the switching device S2First terminal (a) and fast recovery diode D2Is connected with the anode of the fast recovery diode D2Cathode and common inductor L3And an output DC capacitor C connected in parallel4And a load resistance R2Is connected to the first terminal (m) of the common inductor L3And the other end of the diode D and the fast recovery diode D1Is connected with the anode of the power supply, and an output direct current capacitor C is connected in parallel3And a load resistance R1With a second terminal (n) connected in parallel with an output dc capacitor C4And a load resistance R2Is connected to the first terminal (m), the switching device S2And the second terminal (b) of the switching device S3And an output DC capacitor C connected in parallel5And a load resistance R3Is connected with the first terminal (m), and an output direct current capacitor C is connected in parallel4And a load resistance R2With a second terminal (n) connected in parallel with an output dc capacitor C5And a load resistance R3Is connected to the first terminal (m), the switching device S3And the second terminal (b) of the switching device S4First terminal (a) and fast recovery diode D3Is connected to the cathode of a fast recovery diode D3And an output DC capacitor C connected in parallel5And a load resistance R3And an output DC capacitor C connected in parallel6And a load resistance R4Is connected to the first terminal (m), the switching device S4Second terminal (b) of and a dc capacitor C2And a boost inductor L2Is connected to one end of a boost inductor L2The other end of the DC capacitor C is connected with the negative end of the rectification output of the single-phase diode rectifier bridge2The other end of (1) and a common inductor L4And a fast recovery diode D4Is connected to the cathode of a common inductor L4And the other end of the diode D and the fast recovery diode D3Is connected with the anode of the fast recovery diode D4And an output DC capacitor C connected in parallel6And a load resistance R4Is connected to the second terminal (n), the switching device S1First terminal (a) of and boost inductor L1Is connected to one end of a boost inductor L1The other end of the single-phase diode rectifier bridge is connected with the positive end of the rectification output of the single-phase diode rectifier bridge, and the alternating current input end of the single-phase diode rectifier bridge is connected in series with an alternating current power grid through a high-frequency filter.
Referring to fig. 1, 2 and 3, a three-phase parallel rectifier consisting of a five-level rectifier with a common high-voltage dc bus comprises a three-phase main power circuit including three high-frequency filters and three second modular units (B) including a single-phase diode rectifier bridge, two boost inductors L1、L2And a first module unit (A) including four switching devices S1、S2、S3、S4Four fast recovery diodes D1、D2、D3、D4Two common inductors L3、L4Two DC capacitors C1、C2Four output DC capacitors C3、C4、C5、C6And four load resistors R1、R2、R3、R4Switching device S1First terminal (a) of and a dc capacitor C1Is connected to a DC capacitor C1And the other end of the diode D and the fast recovery diode D1Is connected with the anode of the fast recovery diode D1And an output DC capacitor C connected in parallel3And a load resistance R1Is connected to the first terminal (m), the switching device S1And the second terminal (b) of the switching device S2First terminal (a) and fast recovery diode D2Is connected with the anode of the anode and is quickly recoveredComplex diode D2Cathode and common inductor L3And an output DC capacitor C connected in parallel4And a load resistance R2Is connected to the first terminal (m) of the common inductor L3And the other end of the diode D and the fast recovery diode D1Is connected with the anode of the power supply, and an output direct current capacitor C is connected in parallel3And a load resistance R1With a second terminal (n) connected in parallel with an output dc capacitor C4And a load resistance R2Is connected to the first terminal (m), the switching device S2And the second terminal (b) of the switching device S3And an output DC capacitor C connected in parallel5And a load resistance R3Is connected with the first terminal (m), and an output direct current capacitor C is connected in parallel4And a load resistance R2With a second terminal (n) connected in parallel with an output dc capacitor C5And a load resistance R3Is connected to the first terminal (m), the switching device S3And the second terminal (b) of the switching device S4First terminal (a) and fast recovery diode D3Is connected to the cathode of a fast recovery diode D3And an output DC capacitor C connected in parallel5And a load resistance R3And an output DC capacitor C connected in parallel6And a load resistance R4Is connected to the first terminal (m), the switching device S4Second terminal (b) of and a dc capacitor C2And a boost inductor L2Is connected to one end of a boost inductor L2The other end of the DC capacitor C is connected with the negative end of the rectification output of the single-phase diode rectifier bridge2The other end of (1) and a common inductor L4And a fast recovery diode D4Is connected to the cathode of a common inductor L4And the other end of the diode D and the fast recovery diode D3Is connected with the anode of the fast recovery diode D4And an output DC capacitor C connected in parallel6And a load resistance R4Is connected to the second terminal (n), the switching device S1First terminal (a) of and boost inductor L1Is connected to one end of a boost inductor L1The other end of the first phase is connected with the positive end of the rectification output of the single-phase diode rectifier bridge, and the second end of each phase is connected with the positive end of the rectification output of the single-phase diode rectifier bridgeThe direct current output positive end (g) of the module unit (B) is connected, the direct current output negative end (h) of each phase of the second module unit (B) is connected, 2 residual alternating current input ends of each phase of the second module unit (B) are arranged, the first alternating current input end of the three-phase second module unit (B) forms a group of wiring ends, the second alternating current input end of the three-phase second module unit (B) forms another group of wiring ends, one group of wiring ends are connected to a common neutral point, the other group of wiring ends are respectively connected with three high-frequency filters in series and are connected into a three-phase power grid, and star type connection with three-phase output in parallel is formed.
Referring to fig. 1, 2 and 4, the three-phase star rectifier formed by the five-level rectifier with the common high-voltage direct-current bus comprises a three-phase main power circuit which comprises three high-frequency filters and three second module units (B) which comprise a single-phase diode rectifier bridge and two boost inductors L1、L2And a first module unit (A) including four switching devices S1、S2、S3、S4Four fast recovery diodes D1、D2、D3、D4Two common inductors L3、L4Two DC capacitors C1、C2Four output DC capacitors C3、C4、C5、C6And four load resistors R1、R2、R3、R4Switching device S1First terminal (a) of and a dc capacitor C1Is connected to a DC capacitor C1And the other end of the diode D and the fast recovery diode D1Is connected with the anode of the fast recovery diode D1And an output DC capacitor C connected in parallel3And a load resistance R1Is connected to the first terminal (m), the switching device S1And the second terminal (b) of the switching device S2First terminal (a) and fast recovery diode D2Is connected with the anode of the fast recovery diode D2Cathode and common inductor L3And an output DC capacitor C connected in parallel4And a load resistance R2Is connected to the first terminal (m) of the common inductor L3Another end of (1)And a fast recovery diode D1Is connected with the anode of the power supply, and an output direct current capacitor C is connected in parallel3And a load resistance R1With a second terminal (n) connected in parallel with an output dc capacitor C4And a load resistance R2Is connected to the first terminal (m), the switching device S2And the second terminal (b) of the switching device S3And an output DC capacitor C connected in parallel5And a load resistance R3Is connected with the first terminal (m), and an output direct current capacitor C is connected in parallel4And a load resistance R2With a second terminal (n) connected in parallel with an output dc capacitor C5And a load resistance R3Is connected to the first terminal (m), the switching device S3And the second terminal (b) of the switching device S4First terminal (a) and fast recovery diode D3Is connected to the cathode of a fast recovery diode D3And an output DC capacitor C connected in parallel5And a load resistance R3And an output DC capacitor C connected in parallel6And a load resistance R4Is connected to the first terminal (m), the switching device S4Second terminal (b) of and a dc capacitor C2And a boost inductor L2Is connected to one end of a boost inductor L2The other end of the DC capacitor C is connected with the negative end of the rectification output of the single-phase diode rectifier bridge2The other end of (1) and a common inductor L4And a fast recovery diode D4Is connected to the cathode of a common inductor L4And the other end of the diode D and the fast recovery diode D3Is connected with the anode of the fast recovery diode D4And an output DC capacitor C connected in parallel6And a load resistance R4Is connected to the second terminal (n), the switching device S1First terminal (a) of and boost inductor L1Is connected to one end of a boost inductor L1The other end of the three-phase module unit (B) is connected with the positive end of the rectification output of the single-phase diode rectifier bridge, 2 residual AC input ends of the second module unit (B) of each phase, the first AC input end of the three-phase second module unit (B) forms a group of wiring ends, the second AC input end of the three-phase second module unit (B) forms the other group of wiring ends, wherein one group of wiring ends forms one group of wiring endAnd the other group of terminals are respectively connected with three high-frequency filters in series and connected into a three-phase power grid to form an output open type star connection.
Referring to fig. 1, 2 and 5, a three-phase angle rectifier formed by a five-level rectifier with a common high-voltage direct-current bus comprises a three-phase main power circuit including three high-frequency filters and three second module units (B) including a single-phase diode rectifier bridge, two boost inductors L1、L2And a first module unit (A) including four switching devices S1、S2、S3、S4Four fast recovery diodes D1、D2、D3、D4Two common inductors L3、L4Two DC capacitors C1、C2Four output DC capacitors C3、C4、C5、C6And four load resistors R1、R2、R3、R4Switching device S1First terminal (a) of and a dc capacitor C1Is connected to a DC capacitor C1And the other end of the diode D and the fast recovery diode D1Is connected with the anode of the fast recovery diode D1And an output DC capacitor C connected in parallel3And a load resistance R1Is connected to the first terminal (m), the switching device S1And the second terminal (b) of the switching device S2First terminal (a) and fast recovery diode D2Is connected with the anode of the fast recovery diode D2Cathode and common inductor L3And an output DC capacitor C connected in parallel4And a load resistance R2Is connected to the first terminal (m) of the common inductor L3And the other end of the diode D and the fast recovery diode D1Is connected with the anode of the power supply, and an output direct current capacitor C is connected in parallel3And a load resistance R1With a second terminal (n) connected in parallel with an output dc capacitor C4And a load resistance R2Is connected to the first terminal (m), the switching device S2And the second terminal (b) of the switching device S3First connection ofLine terminal (a) and output DC capacitor C connected in parallel5And a load resistance R3Is connected with the first terminal (m), and an output direct current capacitor C is connected in parallel4And a load resistance R2With a second terminal (n) connected in parallel with an output dc capacitor C5And a load resistance R3Is connected to the first terminal (m), the switching device S3And the second terminal (b) of the switching device S4First terminal (a) and fast recovery diode D3Is connected to the cathode of a fast recovery diode D3And an output DC capacitor C connected in parallel5And a load resistance R3And an output DC capacitor C connected in parallel6And a load resistance R4Is connected to the first terminal (m), the switching device S4Second terminal (b) of and a dc capacitor C2And a boost inductor L2Is connected to one end of a boost inductor L2The other end of the DC capacitor C is connected with the negative end of the rectification output of the single-phase diode rectifier bridge2The other end of (1) and a common inductor L4And a fast recovery diode D4Is connected to the cathode of a common inductor L4And the other end of the diode D and the fast recovery diode D3Is connected with the anode of the fast recovery diode D4And an output DC capacitor C connected in parallel6And a load resistance R4Is connected to the second terminal (n), the switching device S1First terminal (a) of and boost inductor L1Is connected to one end of a boost inductor L1The other end of the three-phase module unit (B) is connected with the positive end of the rectification output of the single-phase diode rectifier bridge, 2 residual alternating current input ends of each phase of the second module unit (B), the first alternating current input end of the three-phase second module unit (B) forms a group of wiring ends, the second alternating current input end of the three-phase second module unit (B) forms another group of wiring ends, one group of wiring ends are respectively connected to the input end of the three-phase power grid through three high-frequency filters, and the other group of wiring ends are sequentially connected to the input end of the next phase in the three-phase power.
Referring to fig. 1, 2 and 6, a three-phase double star rectifier formed by a five-level rectifier with a common high-voltage direct-current bus comprises a three-phase main power circuit and three phasesThe main power circuit comprises three high-frequency filters, six bridge arm inductors and three second module units (B), wherein each second module unit (B) comprises a single-phase diode rectifier bridge and two boosting inductors L1、L2And a first module unit (A) including four switching devices S1、S2、S3、S4Four fast recovery diodes D1、D2、D3、D4Two common inductors L3、L4Two DC capacitors C1、C2Four output DC capacitors C3、C4、C5、C6And four load resistors R1、R2、R3、R4Switching device S1First terminal (a) of and a dc capacitor C1Is connected to a DC capacitor C1And the other end of the diode D and the fast recovery diode D1Is connected with the anode of the fast recovery diode D1And an output DC capacitor C connected in parallel3And a load resistance R1Is connected to the first terminal (m), the switching device S1And the second terminal (b) of the switching device S2First terminal (a) and fast recovery diode D2Is connected with the anode of the fast recovery diode D2Cathode and common inductor L3And an output DC capacitor C connected in parallel4And a load resistance R2Is connected to the first terminal (m) of the common inductor L3And the other end of the diode D and the fast recovery diode D1Is connected with the anode of the power supply, and an output direct current capacitor C is connected in parallel3And a load resistance R1With a second terminal (n) connected in parallel with an output dc capacitor C4And a load resistance R2Is connected to the first terminal (m), the switching device S2And the second terminal (b) of the switching device S3And an output DC capacitor C connected in parallel5And a load resistance R3Is connected with the first terminal (m), and an output direct current capacitor C is connected in parallel4And a load resistance R2With a second terminal (n) connected in parallel with an output dc capacitor C5And a load resistance R3Is connected to the first terminal (m), is openedOff device S3And the second terminal (b) of the switching device S4First terminal (a) and fast recovery diode D3Is connected to the cathode of a fast recovery diode D3And an output DC capacitor C connected in parallel5And a load resistance R3And an output DC capacitor C connected in parallel6And a load resistance R4Is connected to the first terminal (m), the switching device S4Second terminal (b) of and a dc capacitor C2And a boost inductor L2Is connected to one end of a boost inductor L2The other end of the DC capacitor C is connected with the negative end of the rectification output of the single-phase diode rectifier bridge2The other end of (1) and a common inductor L4And a fast recovery diode D4Is connected to the cathode of a common inductor L4And the other end of the diode D and the fast recovery diode D3Is connected with the anode of the fast recovery diode D4And an output DC capacitor C connected in parallel6And a load resistance R4Is connected to the second terminal (n), the switching device S1First terminal (a) of and boost inductor L1Is connected to one end of a boost inductor L1The other end of the three-phase bridge arm is connected with the positive end of the rectification output of the single-phase diode rectifier bridge, 2 alternating current input ends are remained in each phase of the second module unit (B), the first alternating current input end of the three-phase second module unit (B) forms a group of wiring ends, the second alternating current input end of the three-phase second module unit (B) forms another group of wiring ends, one group of wiring ends is connected to a common neutral point, the other group of wiring ends is respectively connected with one end of three bridge arm inductors, the other ends of the two bridge arm inductors on each phase of the bridge arm are respectively connected to the input end of a three-phase power grid through one of three high-frequency filters, and meanwhile, the common neutral point in the first group of star connection and the common neutral point in the second group of star connection are respectively connected with the two ends of.
Referring to fig. 1, 2, 3, 4, 5, 6, 7, 8 and 9, the control strategy of the five-level rectifier with a common high-voltage direct-current bus is as follows:
(1) for the bus with common high voltage direct currentThe DC voltage at the output side of the five-level rectifier is sampled to obtain a DC voltage signal U at the output side of the A phaseAo1、UAo2、UAo3、UAo4D.c. voltage signal U at phase B output sideBo1、UBo2、UBo3、UBo4d.C phase output side DC voltage signal UCo1、UCo2、UCo3、UCo4；
(2) Calculating the average value U of the DC voltage signals of each phase output side in the step (1) by using the following formulaAo、UBo、UCo：
Figure BDA0002893238990000101
Figure BDA0002893238990000102
Figure BDA0002893238990000103
(3) Mixing U in step (2)Ao、UBo、UCoRespectively associated with a given signal U of DC voltageo *After comparison, the obtained signal is sent to a PI voltage regulator to obtain the amplitude I of the direct current signal output by the PI voltage regulatorAd *、IBd *、ICd *；
(4) The direct current voltage signal U of the A phase output side in the step (1)Ao1、UAo2、UAo3、UAo4Respectively with the average value U of the DC voltage signals at the A phase output side in the step (2)AoAfter comparison, the obtained signal is sent to a PI voltage regulator to obtain the amplitude I of the output direct current signalAd1、IAd2、IAd3、IAd4The B phase output side direct current voltage signal U in the step (1) is usedBo1、UBo2、UBo3、UBo4Respectively with the average value U of the DC voltage signals at the B phase output side in the step (2)BoAfter comparison, the voltage is sent to a PI voltage regulatorThe regulator is used for obtaining the amplitude I of the output direct current signalBd1、IBd2、IBd3、IBd4(ii) a The C phase output side direct current voltage signal U in the step (1) is processedCo1、UCo2、UCo3、UCo4Respectively with the average value U of the DC voltage signals at the C-phase output side in the step (2)CoAfter comparison, the obtained signal is sent to a PI voltage regulator to obtain the amplitude I of the output direct current signalCd1、ICd2、ICd3、ICd4；
(5) The amplitude I of the direct current signal in the step (3) is measuredBd *Multiplying by 2, and comparing the result with the amplitude I of the DC current signal in the step (3)Ad *Adding to obtain a signal E;
(6) calculating the phase of the phase voltage A at the time t by using a phase-locked loop to obtain a signal uAt, and calculating the sine value ZA and the cosine value YA of the phase voltage A uAt at the time t;
(7) the signal E in the step (5) and the phase u of the A-phase voltage in the step (6) are connectedAtSine value Z ofAMultiply, the obtained result is further multiplied by
Figure BDA0002893238990000104
Multiplying to obtain a signal F, and comparing the amplitude I of the DC signal in the step (3)Ad *Phase u of A phase voltage in step (6)AtCosine value Y ofAMultiplication of the obtained result with
Figure BDA0002893238990000105
Multiplying to obtain a signal G, and adding the signal F and the signal G to obtain a zero-sequence current injection signal Iz；
(8) Sampling three-phase power grid current to obtain an input side alternating current signal IA，IB，ICThe amplitude I of the DC current signal in the step (3) is usedAd *And the amplitude I of the direct current signal in the step (4)Ad1Adding the obtained result to the zero sequence current injection signal I in the step (7)zAdding to obtain A-phase switching device SA1Given current signal IA1 *Switching device S of phase AA1Given power ofStream signal IA1 *Multiplying the signal by a triangular carrier signal to obtain a result, and comparing the result with an A-phase input side alternating current signal IASending the signal into a comparator for comparison to obtain an A-phase switching device SA1PWM signal PWM ofA1；
(9) The amplitude I of the direct current signal in the step (3) is measuredAd *And the amplitude I of the direct current signal in the step (4)Ad2Adding the obtained result to the zero sequence current injection signal I in the step (7)zAdding to obtain A-phase switching device SA2Given current signal IA2 *Delaying the triangular carrier signal in the step (8) by 90 degrees and then switching the triangular carrier signal with the A-phase switching device SA2Given current signal IA2 *Multiplying the result by the A-phase input-side AC current signal IASending the signal into a comparator for comparison to obtain an A-phase switching device SA2PWM signal PWM ofA2；
(10) The amplitude I of the direct current signal in the step (3) is measuredAd *And the amplitude I of the direct current signal in the step (4)Ad3Adding the obtained result to the zero sequence current injection signal I in the step (7)zAdding to obtain A-phase switching device SA3Given current signal IA3 *Delaying the triangular carrier signal in the step (8) by 180 degrees and then switching the triangular carrier signal with the A-phase switching device SA3Given current signal IA3 *Multiplying the result by the A-phase input-side AC current signal IASending the signal into a comparator for comparison to obtain an A-phase switching device SA3PWM signal PWM ofA3；
(11) The amplitude I of the direct current signal in the step (3) is measuredAd *And the amplitude I of the direct current signal in the step (4)Ad4Adding the obtained result to the zero sequence current injection signal I in the step (7)zAdding to obtain A-phase given current signal IA4 *Lagging the triangular carrier signal in the step (8) by 270 degrees and then switching the triangular carrier signal with the A-phase switching device SA4Given current signal IA4 *Multiplying the result by the A-phase input-side AC current signal IASending the voltage into a comparator for comparison to obtain an A-phase switchDevice SA4PWM signal PWM ofA4；
(12) The amplitude I of the direct current signal in the step (3) is measuredBd *And the amplitude I of the direct current signal in the step (4)Bd1Adding the obtained result to the zero sequence current injection signal I in the step (7)zAdding to obtain a B-phase switching device SB1Given current signal IB1 *The triangular carrier signal in the step (8) is connected with a B-phase switching device SB1Given current signal IB1 *Multiplying the result by the AC signal I at the input side of phase BBSending the signals into a comparator for comparison to obtain a B-phase switching device SB1PWM signal PWM ofB1；
(13) The amplitude I of the direct current signal in the step (3) is measuredBd *And the amplitude I of the direct current signal in the step (4)Bd2Adding the obtained result to the zero sequence current injection signal I in the step (7)zAdding to obtain a B-phase switching device SB2Given current signal IB2 *Delaying the triangular carrier signal in the step (8) by 90 degrees and then switching the triangular carrier signal with a B-phase switching device SB2Given current signal IB2 *Multiplying the result by the AC signal I at the input side of phase BBSending the signals into a comparator for comparison to obtain a B-phase switching device SB2PWM signal PWM ofB2；
(14) The amplitude I of the direct current signal in the step (3) is measuredBd *And the amplitude I of the direct current signal in the step (4)Bd3Adding the obtained result to the zero sequence current injection signal I in the step (7)zAdding to obtain a B-phase switching device SB3Given current signal IB3 *Delaying the triangular carrier signal in the step (8) by 180 degrees and then switching the triangular carrier signal with a B-phase switching device SB3Given current signal IB3 *Multiplying the result by the AC signal I at the input side of phase BBSending the signals into a comparator for comparison to obtain a B-phase switching device SB3PWM signal PWM ofB3；
(15) The amplitude I of the direct current signal in the step (3) is measuredBd *And the amplitude I of the direct current signal in the step (4)Bd4Adding the obtained result to the zero sequence current injection signal I in the step (7)zAdding to obtain a B-phase switching device SB4Given current signal IB4 *Lagging the triangular carrier signal in the step (8) by 270 degrees and then switching the triangular carrier signal with a B-phase switching device SB4Given current signal IB4 *Multiplying the result by the AC signal I at the input side of phase BBSending the signals into a comparator for comparison to obtain a B-phase switching device SB4PWM signal PWM ofB4；
(16) The amplitude I of the direct current signal in the step (3) is measuredCd *And the amplitude I of the direct current signal in the step (4)Cd1Adding the obtained result to the zero sequence current injection signal I in the step (7)zAdding to obtain C-phase switching device SC1Given current signal IC1 *The triangular carrier signal in the step (8) is connected with a C-phase switching device SC1Given current signal IC1 *Multiplying the result by the AC signal I at the input side of C phaseCSending the voltage into a comparator for comparison to obtain a C-phase switching device SC1PWM signal PWM ofC1；
(17) The amplitude I of the direct current signal in the step (3) is measuredCd *And the amplitude I of the direct current signal in the step (4)Cd2Adding the obtained result to the zero sequence current injection signal I in the step (7)zAdding to obtain C-phase switching device SC2Given current signal IC2 *Delaying the triangular carrier signal in the step (8) by 90 degrees and then connecting the delayed triangular carrier signal with a C-phase switching device SC2Given current signal IC2 *Multiplying the result by the AC signal I at the input side of C phaseCSending the voltage into a comparator for comparison to obtain a C-phase switching device SC2PWM signal PWM ofC2；
(18) The amplitude I of the direct current signal in the step (3) is measuredCd *And the amplitude I of the direct current signal in the step (4)Cd3Adding the obtained result to the zero sequence current injection signal I in the step (7)zAdding to obtain C phaseSwitching device SC3Given current signal IC3 *Delaying the triangular carrier signal in the step (8) by 180 degrees and then connecting the delayed triangular carrier signal with a C-phase switching device SC3Given current signal IC3 *Multiplying the result by the AC signal I at the input side of C phaseCSending the voltage into a comparator for comparison to obtain a C-phase switching device SC3PWM signal PWM ofC3；
(19) The amplitude I of the direct current signal in the step (3) is measuredCd *And the amplitude I of the direct current signal in the step (4)Cd4Adding the obtained result to the zero sequence current injection signal I in the step (7)zAdding to obtain C-phase switching device SC4Given current signal IC4 *Lagging the triangular carrier signal in the step (8) by 270 degrees and then switching the triangular carrier signal with a C-phase switching device SC4Given current signal IC4 *Multiplying the result by the AC signal I at the input side of C phaseCSending the voltage into a comparator for comparison to obtain a C-phase switching device SC4PWM signal PWM ofC4；
(20) The driving signals of the A phase, the B phase and the C phase are sent to the corresponding switching devices, active power factor correction of the three-phase rectifier is achieved, input current can be made sinusoidal when the power supply voltage conversion range is large, and balance control over output direct current capacitor voltage is achieved.
Referring to fig. 10, in the embodiment of the present invention, for the three-phase input current waveform of the three-phase parallel rectifier formed by the five-level rectifier with the common high-voltage dc bus, even when the three-phase current is unbalanced, the three-phase input current balance can be realized by using the control strategy of the present invention, and the current waveform has good quality and is approximately sinusoidal.
Referring to fig. 11, four dc-side capacitor voltage waveforms U of three-phase parallel rectifier formed by five-level rectifiers with common high-voltage dc bus according to the embodiment of the present inventionAo1、UAo2、UAo3、UAo4And a total output DC side voltage UdcThe voltage waveform on the direct current side has short time for reaching the steady state, and the direct current voltage has small fluctuation.
Referring to fig. 12, an input side five-level voltage waveform of a three-phase parallel rectifier formed by a five-level rectifier with a common high-voltage direct-current bus in the embodiment of the invention.
In other embodiments of the invention for use with a five-level rectifier having a common high-voltage dc bus, the three-phase star, delta and three-phase double star rectifiers described may be a combination of different circuits derived from the second module unit (B) in addition to the second module unit (B).
The five-level rectifier circuit with the common high-voltage direct-current bus can be simply applied to a high-power electronic rectification topological structure, the working efficiency of a system can be improved through a proper control strategy, the capacitor voltage on the direct-current side can be stably balanced, favorable conditions are provided for the later-stage electric energy conversion, and the five-level rectifier circuit has important application value in the application fields of medium-high voltage direct-current transmission, high-power electronic transformers, high-power medium-high voltage alternating-direct-alternating frequency converters and the like.
The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the spirit and scope of the present invention, and various modifications and improvements made to the technical solutions of the present invention by those skilled in the art without departing from the design solutions of the present invention shall fall within the protection scope of the present invention, and the technical contents of the present invention as claimed are all described in the claims.

Claims (6)

1.具有公共高压直流母线的五电平整流器，包括主功率电路，所述主功率电路包括高频滤波器、单相二极管整流桥、两个升压电感L1、L2和第一模块单元(A)，其特征在于：所述第一模块单元(A)包括四个开关器件S1、S2、S3、S4，四个快恢复二极管D1、D2、D3、D4，两个普通电感L3、L4，两个直流电容C1、C2，四个输出直流电容C3、C4、C5、C6和四个负载电阻R1、R2、R3、R4，所述开关器件S1的第一接线端(a)与所述直流电容C1的一端相连，所述直流电容C1的另一端与所述快恢复二极管D1的阳极相连，所述快恢复二极管D1的阴极与并联连接的所述输出直流电容C3和所述负载电阻R1的第一接线端(m)相连，所述开关器件S1的第二接线端(b)与所述开关器件S2的第一接线端(a)及所述快恢复二极管D2的阳极相连，所述快恢复二极管D2的阴极与所述普通电感L3的一端及并联连接的所述输出直流电容C4和所述负载电阻R2的第一接线端(m)相连，所述普通电感L3的另一端与所述快恢复二极管D1的阳极相连，并联连接的所述输出直流电容C3和所述负载电阻R1的第二接线端(n)与并联连接的所述输出直流电容C4和所述负载电阻R2的第一接线端(m)相连，所述开关器件S2的第二接线端(b)与所述开关器件S3的第一接线端(a)及并联连接的所述输出直流电容C5和所述负载电阻R3的第一接线端(m)相连，并联连接的所述输出直流电容C4和所述负载电阻R2的第二接线端(n)与并联连接的所述输出直流电容C5和所述负载电阻R3的第一接线端(m)相连，所述开关器件S3的第二接线端(b)与所述开关器件S4的第一接线端(a)及所述快恢复二极管D3的阴极相连，所述快恢复二极管D3的阳极与并联连接的所述输出直流电容C5和所述负载电阻R3的第二接线端(n)及并联连接的所述输出直流电容C6和所述负载电阻R4的第一接线端(m)相连，所述开关器件S4的第二接线端(b)与所述直流电容C2的一端及所述升压电感L2的一端相连，所述升压电感L2的另一端与所述单相二极管整流桥的整流输出负端相连，所述直流电容C2的另一端与所述普通电感L4的一端及所述快恢复二极管D4的阴极相连，所述普通电感L4的另一端与所述快恢复二极管D3的阳极相连，所述快恢复二极管D4的阳极与并联连接的所述输出直流电容C6和所述负载电阻R4的第二接线端(n)相连，所述开关器件S1的第一接线端(a)与所述升压电感L1的一端相连，所述升压电感L1的另一端与所述单相二极管整流桥的整流输出正端相连，所述单相二极管整流桥的交流输入端经所述高频滤波器串联接入交流电网。1. A five-level rectifier with a common high-voltage DC bus, including a main power circuit including a high-frequency filter, a single-phase diode rectifier bridge, two boost inductors L 1 , L 2 and a first modular unit (A), characterized in that: the first module unit (A) includes four switching devices S 1 , S 2 , S 3 , S 4 , and four fast recovery diodes D 1 , D 2 , D 3 , D 4 , two common inductors L 3 , L 4 , two DC capacitors C 1 , C 2 , four output DC capacitors C 3 , C 4 , C 5 , C 6 and four load resistors R 1 , R 2 , R 3 , R 4 , the first terminal (a) of the switching device S 1 is connected to one end of the DC capacitor C 1 , and the other end of the DC capacitor C 1 is connected to the anode of the fast recovery diode D 1 , The cathode of the fast recovery diode D1 is connected to the first terminal ( m ) of the output DC capacitor C3 and the load resistor R1 connected in parallel, and the second terminal (b) of the switching device S1 ) is connected to the first terminal (a ) of the switching device S2 and the anode of the fast recovery diode D2 , the cathode of the fast recovery diode D2 is connected to one end of the common inductor L3 and the parallel connection The output DC capacitor C4 is connected to the first terminal (m) of the load resistor R2, the other end of the common inductor L3 is connected to the anode of the fast recovery diode D1, and the parallel connected The output DC capacitor C3 and the second terminal (n) of the load resistor R1 are connected to the first terminal (m) of the output DC capacitor C4 and the load resistor R2 connected in parallel. The second terminal (b) of the switching device S2 and the first terminal (a) of the switching device S3 and the first terminal of the output DC capacitor C5 and the load resistor R3 connected in parallel (m) connected, the second terminal (n) of the output DC capacitor C4 and the load resistor R2 connected in parallel is connected to the second terminal (n) of the output DC capacitor C5 and the load resistor R3 connected in parallel A terminal (m) is connected, the second terminal (b) of the switching device S3 is connected to the first terminal (a) of the switching device S4 and the cathode of the fast recovery diode D3 , so The anode of the fast recovery diode D3 is connected in parallel with the second terminal (n) of the output DC capacitor C5 and the load resistor R3 , and the output DC capacitor C6 and the load resistor connected in parallel The first terminal (m) of R 4 is connected, and the second terminal (b) of the switching device S 4 is connected to one end of the DC capacitor C 2 and one end of the boost inductor L 2 . The other end of the piezoelectric inductor L 2 is connected to the negative end of the rectified output of the single-phase diode rectifier bridge, and the other end of the DC capacitor C 2 is connected to one end of the common inductor L 4 and the cathode of the fast recovery diode D 4 connected, the The other end of the common inductor L4 is connected to the anode of the fast recovery diode D3 , and the anode of the fast recovery diode D4 is connected to the second connection of the output DC capacitor C6 and the load resistor R4 connected in parallel terminal (n) is connected, the first terminal (a) of the switching device S1 is connected to one end of the boost inductor L1, and the other end of the boost inductor L1 is connected to the single-phase diode rectifier bridge The positive terminal of the rectifier output is connected, and the AC input terminal of the single-phase diode rectifier bridge is connected to the AC power grid in series through the high-frequency filter. 2.采用权利要求1所述的具有公共高压直流母线的五电平整流器构成的三相并联整流器，包括三相主功率电路，其特征在于：所述三相主功率电路包括三个高频滤波器和三个第二模块单元(B)，所述第二模块单元(B)包括单相二极管整流桥、两个升压电感L1、L2和第一模块单元(A)，所述第一模块单元(A)包括四个开关器件S1、S2、S3、S4，四个快恢复二极管D1、D2、D3、D4，两个普通电感L3、L4，两个直流电容C1、C2，四个输出直流电容C3、C4、C5、C6和四个负载电阻R1、R2、R3、R4，所述开关器件S1的第一接线端(a)与所述直流电容C1的一端相连，所述直流电容C1的另一端与所述快恢复二极管D1的阳极相连，所述快恢复二极管D1的阴极与并联连接的所述输出直流电容C3和所述负载电阻R1的第一接线端(m)相连，所述开关器件S1的第二接线端(b)与所述开关器件S2的第一接线端(a)及所述快恢复二极管D2的阳极相连，所述快恢复二极管D2的阴极与所述普通电感L3的一端及并联连接的所述输出直流电容C4和所述负载电阻R2的第一接线端(m)相连，所述普通电感L3的另一端与所述快恢复二极管D1的阳极相连，并联连接的所述输出直流电容C3和所述负载电阻R1的第二接线端(n)与并联连接的所述输出直流电容C4和所述负载电阻R2的第一接线端(m)相连，所述开关器件S2的第二接线端(b)与所述开关器件S3的第一接线端(a)及并联连接的所述输出直流电容C5和所述负载电阻R3的第一接线端(m)相连，并联连接的所述输出直流电容C4和所述负载电阻R2的第二接线端(n)与并联连接的所述输出直流电容C5和所述负载电阻R3的第一接线端(m)相连，所述开关器件S3的第二接线端(b)与所述开关器件S4的第一接线端(a)及所述快恢复二极管D3的阴极相连，所述快恢复二极管D3的阳极与并联连接的所述输出直流电容C5和所述负载电阻R3的第二接线端(n)及并联连接的所述输出直流电容C6和所述负载电阻R4的第一接线端(m)相连，所述开关器件S4的第二接线端(b)与所述直流电容C2的一端及所述升压电感L2的一端相连，所述升压电感L2的另一端与所述单相二极管整流桥的整流输出负端相连，所述直流电容C2的另一端与所述普通电感L4的一端及所述快恢复二极管D4的阴极相连，所述普通电感L4的另一端与所述快恢复二极管D3的阳极相连，所述快恢复二极管D4的阳极与并联连接的所述输出直流电容C6和所述负载电阻R4的第二接线端(n)相连，所述开关器件S1的第一接线端(a)与所述升压电感L1的一端相连，所述升压电感L1的另一端与所述单相二极管整流桥的整流输出正端相连，每相所述第二模块单元(B)的直流输出正端(g)相连，每相所述第二模块单元(B)的直流输出负端(h)相连，每相所述第二模块单元(B)剩余2个交流输入端，三相所述第二模块单元(B)的第一交流输入端构成一组接线端，三相所述第二模块单元(B)的第二交流输入端构成另一组接线端，其中一组接线端连接到一个公共的中性点上，另外一组接线端分别与三个所述高频滤波器串联，接入三相电网，构成三相输出并联的星型连接。2. The three-phase parallel rectifier composed of the five-level rectifier with a common high-voltage DC bus according to claim 1, comprising a three-phase main power circuit, characterized in that: the three-phase main power circuit comprises three high-frequency filter and three second module units (B), the second module unit (B) includes a single-phase diode rectifier bridge, two boost inductors L 1 , L 2 and the first module unit (A), the first module unit (A) A module unit (A) includes four switching devices S 1 , S 2 , S 3 , S 4 , four fast recovery diodes D 1 , D 2 , D 3 , D 4 , two common inductors L 3 , L 4 , Two DC capacitors C 1 , C 2 , four output DC capacitors C 3 , C 4 , C 5 , C 6 and four load resistors R 1 , R 2 , R 3 , R 4 , the switching device S 1 has The first terminal (a) is connected to one end of the DC capacitor C1 , the other end of the DC capacitor C1 is connected to the anode of the fast recovery diode D1, and the cathode of the fast recovery diode D1 is connected in parallel The connected output DC capacitor C3 is connected to the first terminal ( m ) of the load resistor R1, and the second terminal (b) of the switching device S1 is connected to the first terminal (b) of the switching device S2. Terminal (a ) is connected with the anode of the fast recovery diode D2 , the cathode of the fast recovery diode D2 is connected with one end of the common inductor L3 and the output DC capacitor C4 and the load connected in parallel The first terminal (m) of the resistor R2 is connected, the other end of the common inductor L3 is connected to the anode of the fast recovery diode D1, the output DC capacitor C3 and the load resistor R are connected in parallel The second terminal (n) of 1 is connected to the first terminal (m) of the output DC capacitor C4 and the load resistor R2 connected in parallel, and the second terminal (b ) of the switching device S2 ) is connected to the first terminal (a) of the switching device S3 and the first terminal (m) of the output DC capacitor C5 and the load resistor R3 connected in parallel, and the output of the parallel connection The second terminal (n) of the DC capacitor C4 and the load resistor R2 is connected to the first terminal (m) of the output DC capacitor C5 and the load resistor R3 connected in parallel, and the switch The second terminal (b) of the device S3 is connected to the first terminal (a ) of the switching device S4 and the cathode of the fast recovery diode D3 , and the anode of the fast recovery diode D3 is connected in parallel The output DC capacitor C5 and the second terminal (n) of the load resistor R3 and the output DC capacitor C6 connected in parallel are connected to the first terminal (m) of the load resistor R4 , the second terminal (b ) of the switching device S4 is connected to one end of the DC capacitor C2 and one end of the boost inductor L2, and the other end of the boost inductor L2 is connected to the single Rectified output of phase diode rectifier bridge The negative end is connected, the other end of the DC capacitor C 2 is connected to one end of the common inductor L 4 and the cathode of the fast recovery diode D 4 , and the other end of the common inductor L 4 is connected to the fast recovery diode D The anode of the fast recovery diode D 4 is connected to the second terminal (n) of the output DC capacitor C 6 and the load resistor R 4 connected in parallel, and the second terminal (n) of the switching device S 1 A terminal (a) is connected to one end of the boost inductor L 1 , and the other end of the boost inductor L 1 is connected to the positive end of the rectified output of the single-phase diode rectifier bridge. The second module of each phase The DC output positive terminal (g) of the unit (B) is connected, the DC output negative terminal (h) of the second module unit (B) of each phase is connected, and the second module unit (B) of each phase has two AC remaining Input terminal, the first AC input terminal of the three-phase second module unit (B) constitutes a group of terminals, and the second AC input terminal of the three-phase second module unit (B) constitutes another group of terminals, One group of terminals is connected to a common neutral point, and the other group of terminals is respectively connected in series with three of the high-frequency filters and connected to the three-phase power grid to form a star connection with three-phase outputs in parallel. 3.采用权利要求1所述的具有公共高压直流母线的五电平整流器构成的三相星接整流器，包括三相主功率电路，其特征在于：所述三相主功率电路包括三个高频滤波器和三个第二模块单元(B)，所述第二模块单元(B)包括单相二极管整流桥、两个升压电感L1、L2和第一模块单元(A)，所述第一模块单元(A)包括四个开关器件S1、S2、S3、S4，四个快恢复二极管D1、D2、D3、D4，两个普通电感L3、L4，两个直流电容C1、C2，四个输出直流电容C3、C4、C5、C6和四个负载电阻R1、R2、R3、R4，所述开关器件S1的第一接线端(a)与所述直流电容C1的一端相连，所述直流电容C1的另一端与所述快恢复二极管D1的阳极相连，所述快恢复二极管D1的阴极与并联连接的所述输出直流电容C3和所述负载电阻R1的第一接线端(m)相连，所述开关器件S1的第二接线端(b)与所述开关器件S2的第一接线端(a)及所述快恢复二极管D2的阳极相连，所述快恢复二极管D2的阴极与所述普通电感L3的一端及并联连接的所述输出直流电容C4和所述负载电阻R2的第一接线端(m)相连，所述普通电感L3的另一端与所述快恢复二极管D1的阳极相连，并联连接的所述输出直流电容C3和所述负载电阻R1的第二接线端(n)与并联连接的所述输出直流电容C4和所述负载电阻R2的第一接线端(m)相连，所述开关器件S2的第二接线端(b)与所述开关器件S3的第一接线端(a)及并联连接的所述输出直流电容C5和所述负载电阻R3的第一接线端(m)相连，并联连接的所述输出直流电容C4和所述负载电阻R2的第二接线端(n)与并联连接的所述输出直流电容C5和所述负载电阻R3的第一接线端(m)相连，所述开关器件S3的第二接线端(b)与所述开关器件S4的第一接线端(a)及所述快恢复二极管D3的阴极相连，所述快恢复二极管D3的阳极与并联连接的所述输出直流电容C5和所述负载电阻R3的第二接线端(n)及并联连接的所述输出直流电容C6和所述负载电阻R4的第一接线端(m)相连，所述开关器件S4的第二接线端(b)与所述直流电容C2的一端及所述升压电感L2的一端相连，所述升压电感L2的另一端与所述单相二极管整流桥的整流输出负端相连，所述直流电容C2的另一端与所述普通电感L4的一端及所述快恢复二极管D4的阴极相连，所述普通电感L4的另一端与所述快恢复二极管D3的阳极相连，所述快恢复二极管D4的阳极与并联连接的所述输出直流电容C6和所述负载电阻R4的第二接线端(n)相连，所述开关器件S1的第一接线端(a)与所述升压电感L1的一端相连，所述升压电感L1的另一端与所述单相二极管整流桥的整流输出正端相连，每相所述第二模块单元(B)剩余2个交流输入端，三相所述第二模块单元(B)的第一交流输入端构成一组接线端，三相所述第二模块单元(B)的第二交流输入端构成另一组接线端，其中一组接线端连接到一个公共的中性点上，另外一组接线端分别与三个所述高频滤波器串联，接入三相电网，构成输出开放式的星形连接。3. The three-phase star-connected rectifier formed by the five-level rectifier with a common high-voltage DC bus according to claim 1, comprising a three-phase main power circuit, wherein the three-phase main power circuit comprises three high-frequency A filter and three second module units (B), the second module units (B) comprising a single-phase diode rectifier bridge, two boost inductors L 1 , L 2 and a first module unit (A), the The first module unit (A) includes four switching devices S 1 , S 2 , S 3 , S 4 , four fast recovery diodes D 1 , D 2 , D 3 , D 4 , two common inductors L 3 , L 4 , two DC capacitors C 1 , C 2 , four output DC capacitors C 3 , C 4 , C 5 , C 6 and four load resistors R 1 , R 2 , R 3 , R 4 , the switching device S 1 The first terminal (a) is connected to one end of the DC capacitor C1 , the other end of the DC capacitor C1 is connected to the anode of the fast recovery diode D1, and the cathode of the fast recovery diode D1 is connected to the The output DC capacitor C3 connected in parallel is connected to the first terminal ( m ) of the load resistor R1, and the second terminal (b) of the switching device S1 is connected to the first terminal (b) of the switching device S2. A terminal (a ) is connected to the anode of the fast recovery diode D2, and the cathode of the fast recovery diode D2 is connected to one end of the common inductor L3 and the output DC capacitor C4 connected in parallel with the The first terminal (m) of the load resistor R2 is connected, the other end of the common inductor L3 is connected to the anode of the fast recovery diode D1, and the output DC capacitor C3 and the load resistor are connected in parallel The second terminal (n) of R 1 is connected to the first terminal (m) of the output DC capacitor C 4 and the load resistor R 2 connected in parallel, and the second terminal ( b) Connected to the first terminal (a) of the switching device S3 and the first terminal (m) of the output DC capacitor C5 and the load resistor R3 connected in parallel, and the parallel connected The output DC capacitor C4 and the second terminal (n) of the load resistor R2 are connected to the first terminal (m) of the output DC capacitor C5 and the load resistor R3 connected in parallel. The second terminal (b) of the switching device S3 is connected to the first terminal (a ) of the switching device S4 and the cathode of the fast recovery diode D3 , and the anode of the fast recovery diode D3 is connected in parallel with the The second terminal (n) of the output DC capacitor C5 and the load resistor R3 connected and the first terminal (m) of the output DC capacitor C6 and the load resistor R4 connected in parallel connected, the second terminal (b) of the switching device S 4 is connected to one end of the DC capacitor C 2 and one end of the boost inductor L 2 , and the other end of the boost inductor L 2 is connected to the Rectified output of single-phase diode rectifier bridge The negative end is connected, the other end of the DC capacitor C 2 is connected to one end of the common inductor L 4 and the cathode of the fast recovery diode D 4 , and the other end of the common inductor L 4 is connected to the fast recovery diode D The anode of the fast recovery diode D 4 is connected to the second terminal (n) of the output DC capacitor C 6 and the load resistor R 4 connected in parallel, and the second terminal (n) of the switching device S 1 A terminal (a) is connected to one end of the boost inductor L 1 , and the other end of the boost inductor L 1 is connected to the positive end of the rectified output of the single-phase diode rectifier bridge. The second module of each phase The unit (B) has two remaining AC input terminals, the first AC input terminal of the three-phase second module unit (B) constitutes a group of terminals, and the second AC input terminal of the three-phase second module unit (B) The terminals form another group of terminals, one of which is connected to a common neutral point, and the other group of terminals is connected in series with three of the high-frequency filters, respectively, connected to the three-phase power grid to form an output open type star connection. 4.采用权利要求1所述的具有公共高压直流母线的五电平整流器构成的三相角接整流器，包括三相主功率电路，其特征在于：所述三相主功率电路包括三个高频滤波器和三个第二模块单元(B)，所述第二模块单元(B)包括单相二极管整流桥、两个升压电感L1、L2和第一模块单元(A)，所述第一模块单元(A)包括四个开关器件S1、S2、S3、S4，四个快恢复二极管D1、D2、D3、D4，两个普通电感L3、L4，两个直流电容C1、C2，四个输出直流电容C3、C4、C5、C6和四个负载电阻R1、R2、R3、R4，所述开关器件S1的第一接线端(a)与所述直流电容C1的一端相连，所述直流电容C1的另一端与所述快恢复二极管D1的阳极相连，所述快恢复二极管D1的阴极与并联连接的所述输出直流电容C3和所述负载电阻R1的第一接线端(m)相连，所述开关器件S1的第二接线端(b)与所述开关器件S2的第一接线端(a)及所述快恢复二极管D2的阳极相连，所述快恢复二极管D2的阴极与所述普通电感L3的一端及并联连接的所述输出直流电容C4和所述负载电阻R2的第一接线端(m)相连，所述普通电感L3的另一端与所述快恢复二极管D1的阳极相连，并联连接的所述输出直流电容C3和所述负载电阻R1的第二接线端(n)与并联连接的所述输出直流电容C4和所述负载电阻R2的第一接线端(m)相连，所述开关器件S2的第二接线端(b)与所述开关器件S3的第一接线端(a)及并联连接的所述输出直流电容C5和所述负载电阻R3的第一接线端(m)相连，并联连接的所述输出直流电容C4和所述负载电阻R2的第二接线端(n)与并联连接的所述输出直流电容C5和所述负载电阻R3的第一接线端(m)相连，所述开关器件S3的第二接线端(b)与所述开关器件S4的第一接线端(a)及所述快恢复二极管D3的阴极相连，所述快恢复二极管D3的阳极与并联连接的所述输出直流电容C5和所述负载电阻R3的第二接线端(n)及并联连接的所述输出直流电容C6和所述负载电阻R4的第一接线端(m)相连，所述开关器件S4的第二接线端(b)与所述直流电容C2的一端及所述升压电感L2的一端相连，所述升压电感L2的另一端与所述单相二极管整流桥的整流输出负端相连，所述直流电容C2的另一端与所述普通电感L4的一端及所述快恢复二极管D4的阴极相连，所述普通电感L4的另一端与所述快恢复二极管D3的阳极相连，所述快恢复二极管D4的阳极与并联连接的所述输出直流电容C6和所述负载电阻R4的第二接线端(n)相连，所述开关器件S1的第一接线端(a)与所述升压电感L1的一端相连，所述升压电感L1的另一端与所述单相二极管整流桥的整流输出正端相连，每相所述第二模块单元(B)剩余2个交流输入端，三相所述第二模块单元(B)的第一交流输入端构成一组接线端，三相所述第二模块单元(B)的第二交流输入端构成另一组接线端，其中一组接线端分别经三个所述高频滤波器接至三相电网输入端，另一组接线端依次连接至三相电网中的下一相输入端，构成角形连接。4. The three-phase delta rectifier formed by the five-level rectifier with a common high-voltage DC bus according to claim 1, comprising a three-phase main power circuit, characterized in that: the three-phase main power circuit comprises three high-frequency A filter and three second module units (B), the second module units (B) comprising a single-phase diode rectifier bridge, two boost inductors L 1 , L 2 and a first module unit (A), the The first module unit (A) includes four switching devices S 1 , S 2 , S 3 , S 4 , four fast recovery diodes D 1 , D 2 , D 3 , D 4 , two common inductors L 3 , L 4 , two DC capacitors C 1 , C 2 , four output DC capacitors C 3 , C 4 , C 5 , C 6 and four load resistors R 1 , R 2 , R 3 , R 4 , the switching device S 1 The first terminal (a) is connected to one end of the DC capacitor C1 , the other end of the DC capacitor C1 is connected to the anode of the fast recovery diode D1, and the cathode of the fast recovery diode D1 is connected to the The output DC capacitor C3 connected in parallel is connected to the first terminal ( m ) of the load resistor R1, and the second terminal (b) of the switching device S1 is connected to the first terminal (b) of the switching device S2. A terminal (a ) is connected to the anode of the fast recovery diode D2, and the cathode of the fast recovery diode D2 is connected to one end of the common inductor L3 and the output DC capacitor C4 connected in parallel with the The first terminal (m) of the load resistor R2 is connected, the other end of the common inductor L3 is connected to the anode of the fast recovery diode D1, and the output DC capacitor C3 and the load resistor are connected in parallel The second terminal (n) of R 1 is connected to the first terminal (m) of the output DC capacitor C 4 and the load resistor R 2 connected in parallel, and the second terminal ( b) Connected to the first terminal (a) of the switching device S3 and the first terminal (m) of the output DC capacitor C5 and the load resistor R3 connected in parallel, and the parallel connected The output DC capacitor C4 and the second terminal (n) of the load resistor R2 are connected to the first terminal (m) of the output DC capacitor C5 and the load resistor R3 connected in parallel. The second terminal (b) of the switching device S3 is connected to the first terminal (a ) of the switching device S4 and the cathode of the fast recovery diode D3 , and the anode of the fast recovery diode D3 is connected in parallel with the The second terminal (n) of the output DC capacitor C5 and the load resistor R3 connected and the first terminal (m) of the output DC capacitor C6 and the load resistor R4 connected in parallel connected, the second terminal (b) of the switching device S 4 is connected to one end of the DC capacitor C 2 and one end of the boost inductor L 2 , and the other end of the boost inductor L 2 is connected to the Rectified output of single-phase diode rectifier bridge The negative end is connected, the other end of the DC capacitor C 2 is connected to one end of the common inductor L 4 and the cathode of the fast recovery diode D 4 , and the other end of the common inductor L 4 is connected to the fast recovery diode D The anode of the fast recovery diode D 4 is connected to the second terminal (n) of the output DC capacitor C 6 and the load resistor R 4 connected in parallel, and the second terminal (n) of the switching device S 1 A terminal (a) is connected to one end of the boost inductor L 1 , and the other end of the boost inductor L 1 is connected to the positive end of the rectified output of the single-phase diode rectifier bridge. The second module of each phase The unit (B) has two remaining AC input terminals, the first AC input terminal of the three-phase second module unit (B) constitutes a group of terminals, and the second AC input terminal of the three-phase second module unit (B) The terminals form another group of terminals, one of which is connected to the input terminal of the three-phase power grid through the three high-frequency filters respectively, and the other group of terminals is connected to the input terminal of the next phase in the three-phase power grid in turn, form an angular connection. 5.采用权利要求1所述的具有公共高压直流母线的五电平整流器构成的三相双星接整流器，包括三相主功率电路，其特征在于：所述三相主功率电路包括三个高频滤波器，六个桥臂电感和三个第二模块单元(B)，所述第二模块单元(B)包括单相二极管整流桥、两个升压电感L1、L2和第一模块单元(A)，所述第一模块单元(A)包括四个开关器件S1、S2、S3、S4，四个快恢复二极管D1、D2、D3、D4，两个普通电感L3、L4，两个直流电容C1、C2，四个输出直流电容C3、C4、C5、C6和四个负载电阻R1、R2、R3、R4，所述开关器件S1的第一接线端(a)与所述直流电容C1的一端相连，所述直流电容C1的另一端与所述快恢复二极管D1的阳极相连，所述快恢复二极管D1的阴极与并联连接的所述输出直流电容C3和所述负载电阻R1的第一接线端(m)相连，所述开关器件S1的第二接线端(b)与所述开关器件S2的第一接线端(a)及所述快恢复二极管D2的阳极相连，所述快恢复二极管D2的阴极与所述普通电感L3的一端及并联连接的所述输出直流电容C4和所述负载电阻R2的第一接线端(m)相连，所述普通电感L3的另一端与所述快恢复二极管D1的阳极相连，并联连接的所述输出直流电容C3和所述负载电阻R1的第二接线端(n)与并联连接的所述输出直流电容C4和所述负载电阻R2的第一接线端(m)相连，所述开关器件S2的第二接线端(b)与所述开关器件S3的第一接线端(a)及并联连接的所述输出直流电容C5和所述负载电阻R3的第一接线端(m)相连，并联连接的所述输出直流电容C4和所述负载电阻R2的第二接线端(n)与并联连接的所述输出直流电容C5和所述负载电阻R3的第一接线端(m)相连，所述开关器件S3的第二接线端(b)与所述开关器件S4的第一接线端(a)及所述快恢复二极管D3的阴极相连，所述快恢复二极管D3的阳极与并联连接的所述输出直流电容C5和所述负载电阻R3的第二接线端(n)及并联连接的所述输出直流电容C6和所述负载电阻R4的第一接线端(m)相连，所述开关器件S4的第二接线端(b)与所述直流电容C2的一端及所述升压电感L2的一端相连，所述升压电感L2的另一端与所述单相二极管整流桥的整流输出负端相连，所述直流电容C2的另一端与所述普通电感L4的一端及所述快恢复二极管D4的阴极相连，所述普通电感L4的另一端与所述快恢复二极管D3的阳极相连，所述快恢复二极管D4的阳极与并联连接的所述输出直流电容C6和所述负载电阻R4的第二接线端(n)相连，所述开关器件S1的第一接线端(a)与所述升压电感L1的一端相连，所述升压电感L1的另一端与所述单相二极管整流桥的整流输出正端相连，每相所述第二模块单元(B)剩余2个交流输入端，三相所述第二模块单元(B)的第一交流输入端构成一组接线端，三相所述第二模块单元(B)的第二交流输入端构成另一组接线端，其中一组接线端连接到一个公共中性点，另一组接线端分别与三个所述桥臂电感的一端相连，而在每相桥臂上的两个所述桥臂电感的另一端各自相连，并分别经三个所述高频滤波器之一接至三相电网输入端，同时，第一组星形连接中的公共中性点和第二组星形连接中的公共中性点分别与所述直流电容的两端相连，构成双星形连接。5. The three-phase double star-connected rectifier formed by the five-level rectifier with a public high-voltage DC bus according to claim 1, comprising a three-phase main power circuit, characterized in that: the three-phase main power circuit comprises three high-frequency filter, six bridge arm inductors and three second module units (B), the second module unit (B) includes a single-phase diode rectifier bridge, two boost inductors L 1 , L 2 and the first module unit (A), the first module unit (A) includes four switching devices S 1 , S 2 , S 3 , S 4 , four fast recovery diodes D 1 , D 2 , D 3 , D 4 , two common Inductors L 3 , L 4 , two DC capacitors C 1 , C 2 , four output DC capacitors C 3 , C 4 , C 5 , C 6 and four load resistors R 1 , R 2 , R 3 , R 4 , The first terminal (a) of the switching device S1 is connected to one end of the DC capacitor C1 , and the other end of the DC capacitor C1 is connected to the anode of the fast recovery diode D1. The cathode of the diode D1 is connected to the first terminal ( m ) of the output DC capacitor C3 and the load resistor R1 connected in parallel, and the second terminal (b) of the switching device S1 is connected to the The first terminal (a ) of the switching device S2 is connected to the anode of the fast recovery diode D2 , and the cathode of the fast recovery diode D2 is connected to one end of the common inductor L3 and the output DC power connected in parallel. The capacitor C4 is connected to the first terminal (m) of the load resistor R2, the other end of the common inductor L3 is connected to the anode of the fast recovery diode D1, and the output DC capacitor C is connected in parallel 3 and the second terminal (n) of the load resistor R 1 are connected to the output DC capacitor C 4 and the first terminal (m) of the load resistor R 2 connected in parallel, and the switching device S 2 The second terminal (b) of the switching device S3 is connected to the first terminal (a) of the switching device S3 and the first terminal (m) of the output DC capacitor C5 and the load resistor R3 connected in parallel , the second terminal (n) of the output DC capacitor C4 and the load resistor R2 connected in parallel and the first terminal (n) of the output DC capacitor C5 and the load resistor R3 connected in parallel m) connected, the second terminal (b) of the switching device S3 is connected to the first terminal (a ) of the switching device S4 and the cathode of the fast recovery diode D3 , the fast recovery diode The anode of D3 is connected in parallel with the second terminal (n) of the output DC capacitor C5 and the load resistor R3 and the second terminal (n) of the output DC capacitor C6 and the load resistor R4 connected in parallel A terminal (m) is connected, the second terminal (b) of the switching device S 4 is connected to one end of the DC capacitor C 2 and one end of the boost inductor L 2 , the boost inductor L 2 the other end of the single-phase diode with the The rectified output negative end of the rectifier bridge is connected, the other end of the DC capacitor C2 is connected to one end of the common inductor L4 and the cathode of the fast recovery diode D4 , and the other end of the common inductor L4 is connected to the The anode of the fast recovery diode D3 is connected to the anode of the fast recovery diode D4, and the anode of the fast recovery diode D4 is connected to the second terminal (n) of the output DC capacitor C6 and the load resistor R4, which are connected in parallel . The first terminal (a) of the device S1 is connected to one end of the boost inductor L1, and the other end of the boost inductor L1 is connected to the positive end of the rectified output of the single-phase diode rectifier bridge. The second module unit (B) has two remaining AC input terminals, the first AC input terminals of the three-phase second module unit (B) constitute a group of terminals, and the three-phase second module unit (B) The second AC input terminal of the circuit constitutes another group of terminals, wherein one group of terminals is connected to a common neutral point, and the other group of terminals is respectively connected to one end of the three bridge arm inductors, and in each phase bridge arm The other ends of the two bridge arm inductors are connected to each other, and are respectively connected to the input end of the three-phase power grid through one of the three high-frequency filters. At the same time, the common neutral point in the first group of star connections and the common neutral point in the second group of star connections are respectively connected with both ends of the DC capacitor to form a double star connection. 6.具有公共高压直流母线的五电平整流器及控制策略，其特征在于，步骤如下：6. A five-level rectifier with a public high-voltage DC bus and a control strategy, characterized in that the steps are as follows: (1)对具有公共高压直流母线的五电平整流器的输出侧直流电压进行采样，得到A相输出侧直流电压信号UAo1、UAo2、UAo3、UAo4，B相输出侧直流电压信号UBo1、UBo2、UBo3、UBo4，C相输出侧直流电压信号UCo1、UCo2、UCo3、UCo4；(1) Sampling the DC voltage at the output side of the five-level rectifier with a common high-voltage DC bus to obtain the DC voltage signals U Ao1 , U Ao2 , U Ao3 , and U Ao4 at the output side of the A-phase, and the DC voltage signal U at the output side of the B-phase Bo1 , U Bo2 , U Bo3 , U Bo4 , C-phase output side DC voltage signals U Co1 , U Co2 , U Co3 , U Co4 ; (2)利用下式计算步骤(1)中每相输出侧直流电压信号的平均值UAo、UBo、UCo：(2) Calculate the average values U Ao , U Bo , and U Co of the DC voltage signal at the output side of each phase in step (1) using the following formula:
Figure FDA0002893238980000041
Figure FDA0002893238980000041
Figure FDA0002893238980000042
Figure FDA0002893238980000042
Figure FDA0002893238980000043
Figure FDA0002893238980000043
 (3)将步骤(2)中的UAo、UBo、UCo分别与直流电压给定信号Uo *比较后送入PI电压调节器，得到PI电压调节器输出直流电流信号幅值IAd *、IBd *、ICd *；(3) U Ao , U Bo , U Co in step (2) are respectively compared with the DC voltage given signal U o * and sent to the PI voltage regulator to obtain the output DC current signal amplitude I Ad of the PI voltage regulator * , I Bd * , I Cd * ; (4)将步骤(1)中的A相输出侧直流电压信号UAo1、UAo2、UAo3、UAo4分别与步骤(2)中的A相输出侧直流电压信号平均值UAo比较后送入PI电压调节器，得到输出直流电流信号幅值IAd1、IAd2、IAd3、IAd4，将步骤(1)中的B相输出侧直流电压信号UBo1、UBo2、UBo3、UBo4分别与步骤(2)中的B相输出侧直流电压信号平均值UBo比较后送入PI电压调节器，得到输出直流电流信号幅值IBd1、IBd2、IBd3、IBd4；将步骤(1)中的C相输出侧直流电压信号UCo1、UCo2、UCo3、UCo4分别与步骤(2)中的C相输出侧直流电压信号平均值UCo比较后送入PI电压调节器，得到输出直流电流信号幅值ICd1、ICd2、ICd3、ICd4；(4) Compare the DC voltage signals U Ao1 , U Ao2 , U Ao3 , and U Ao4 of the A-phase output side in step (1) with the average value U Ao of the A-phase output side DC voltage signals in step (2), respectively, and then send into the PI voltage regulator to obtain the output DC current signal amplitudes I Ad1 , I Ad2 , I Ad3 , I Ad4 , and use the phase B output side DC voltage signals U Bo1 , U Bo2 , U Bo3 , U Bo4 in step (1). After comparing with the B-phase output side DC voltage signal average value U Bo in the step (2) respectively, it is sent to the PI voltage regulator to obtain the output DC current signal amplitudes I Bd1 , I Bd2 , I Bd3 , I Bd4 ; The C-phase output side DC voltage signals U Co1 , U Co2 , U Co3 , and U Co4 in 1) are respectively compared with the C-phase output side DC voltage signal average value U Co in step (2) and then sent to the PI voltage regulator, Obtain the output DC current signal amplitudes I Cd1 , I Cd2 , I Cd3 , I Cd4 ; (5)将步骤(3)中的直流电流信号幅值IBd *与2相乘，所得结果与步骤(3)中的直流电流信号幅值IAd *相加得到信号E；(5) multiply the DC current signal amplitude I Bd * in the step (3) with 2, and the result obtained and the DC current signal amplitude I Ad * in the step (3) are added to obtain the signal E; (6)利用锁相环计算t时刻A相电压相位得到信号uAt，计算t时刻A相电压相位uAt的正弦值ZA、余弦值YA；(6) use the phase-locked loop to calculate the phase A voltage phase at time t to obtain the signal u At , and calculate the sine value Z A and the cosine value Y A of the phase A voltage phase u At at time t; (7)将步骤(5)中的信号E与步骤(6)中的A相电压相位uAt的正弦值ZA相乘，所得结果再与
Figure FDA0002893238980000044
相乘得到信号F，将步骤(3)中的直流电流信号幅值IAd *与步骤(6)中的A相电压相位uAt的余弦值YA相乘，所得结果与
Figure FDA0002893238980000045
相乘得到信号G，将信号F和信号G相加得到零序电流注入信号Iz；(7) Multiply the signal E in the step (5) with the sine value Z A of the A-phase voltage phase u At in the step (6), and the result obtained is then combined with
Figure FDA0002893238980000044
The signal F is obtained by multiplying, and the DC current signal amplitude I Ad * in the step (3) is multiplied by the cosine value Y A of the A-phase voltage phase u At in the step (6), and the result obtained is the same as the
Figure FDA0002893238980000045
Multiplying to obtain signal G, adding signal F and signal G to obtain zero-sequence current injection signal I z ; (8)对三相电网电流进行采样，得到输入侧交流电流信号IA，IB，IC，将步骤(3)中的直流电流信号幅值IAd *与步骤(4)中的直流电流信号幅值IAd1相加，所得结果再与步骤(7)中的零序电流注入信号Iz相加得到A相开关器件SA1的给定电流信号IA1 *，将A相开关器件SA1的给定电流信号IA1 *与三角载波信号相乘，所得结果与A相输入侧交流电流信号IA送入比较器进行比较，得到A相开关器件SA1的PWM信号PWMA1；(8) Sampling the three-phase grid current to obtain the input side AC current signals I A , I B , I C , and compare the DC current signal amplitude I Ad * in step (3) with the DC current in step (4) The signal amplitude I Ad1 is added, and the result obtained is added with the zero-sequence current injection signal I z in step (7) to obtain the given current signal I A1 * of the A-phase switching device S A1 , and the A-phase switching device S A1 The given current signal I A1 * is multiplied by the triangular carrier signal, and the result obtained is sent into the comparator with the A-phase input side alternating current signal I A for comparison, and the PWM signal PWM A1 of the A-phase switching device S A1 is obtained; (9)将步骤(3)中的直流电流信号幅值IAd *与步骤(4)中的直流电流信号幅值IAd2相加，所得结果再与步骤(7)中的零序电流注入信号Iz相加得到A相开关器件SA2的给定电流信号IA2 *，将步骤(8)中的三角载波信号滞后90°，再与A相开关器件SA2的给定电流信号IA2 *相乘，将所得结果与A相输入侧交流电流信号IA送入比较器进行比较，得到A相开关器件SA2的PWM信号PWMA2；(9) add the DC current signal amplitude I Ad * in the step (3) to the DC current signal amplitude I Ad2 in the step (4), and the result is added to the zero-sequence current injection signal in the step (7) I z is added to obtain the given current signal I A2 * of the A-phase switching device S A2 , the triangular carrier signal in step (8) is delayed by 90°, and then combined with the given current signal I A2 * of the A-phase switching device S A2 Multiply, the result obtained and the A-phase input side alternating current signal I A are sent into the comparator for comparison, and the PWM signal PWM A2 of the A-phase switching device S A2 is obtained; (10)将步骤(3)中的直流电流信号幅值IAd *与步骤(4)中的直流电流信号幅值IAd3相加，所得结果再与步骤(7)中的零序电流注入信号Iz相加得到A相开关器件SA3的给定电流信号IA3 *，将步骤(8)中的三角载波信号滞后180°，再与A相开关器件SA3的给定电流信号IA3 *相乘，将所得结果与A相输入侧交流电流信号IA送入比较器进行比较，得到A相开关器件SA3的PWM信号PWMA3；(10) add the DC current signal amplitude I Ad * in the step (3) to the DC current signal amplitude I Ad3 in the step (4), and add the result to the zero-sequence current injection signal in the step (7) I z is added to obtain the given current signal I A3 * of the A-phase switching device S A3 , the triangular carrier signal in step (8) is delayed by 180°, and then combined with the given current signal I A3 * of the A-phase switching device S A3 Multiply, the result obtained and the A-phase input side alternating current signal I A are sent into the comparator for comparison, and the PWM signal PWM A3 of the A-phase switching device S A3 is obtained; (11)将步骤(3)中的直流电流信号幅值IAd *与步骤(4)中的直流电流信号幅值IAd4相加，所得结果再与步骤(7)中的零序电流注入信号Iz相加得到A相给定电流信号IA4 *，将步骤(8)中的三角载波信号滞后270°，再与A相开关器件SA4的给定电流信号IA4 *相乘，将所得结果与A相输入侧交流电流信号IA送入比较器进行比较，得到A相开关器件SA4的PWM信号PWMA4；(11) add the DC current signal amplitude I Ad * in the step (3) to the DC current signal amplitude I Ad4 in the step (4), and the result is added to the zero-sequence current injection signal in the step (7) I z is added to obtain the A-phase given current signal I A4 * , the triangular carrier signal in step (8) is delayed by 270°, and then multiplied by the given current signal I A4 * of the A-phase switching device S A4 , and the obtained The result is sent into the comparator with the A-phase input side alternating current signal I A for comparison, and obtains the PWM signal PWM A4 of the A-phase switching device S A4 ; (12)将步骤(3)中的直流电流信号幅值IBd *与步骤(4)中的直流电流信号幅值IBd1相加，所得结果再与步骤(7)中的零序电流注入信号Iz相加得到B相开关器件SB1的给定电流信号IB1 *，将步骤(8)中的三角载波信号与B相开关器件SB1的给定电流信号IB1 *相乘，将所得结果与B相输入侧交流电流信号IB送入比较器进行比较，得到B相开关器件SB1的PWM信号PWMB1；(12) Add the DC current signal amplitude I Bd * in step (3) to the DC current signal amplitude I Bd1 in step (4), and add the result to the zero-sequence current injection signal in step (7) The given current signal I B1 * of the B-phase switching device S B1 is obtained by adding I z , the triangular carrier signal in step (8) is multiplied by the given current signal I B1 * of the B-phase switching device S B1 , and the obtained The result is sent into the comparator with the B-phase input side alternating current signal I B for comparison, and the PWM signal PWM B1 of the B-phase switching device S B1 is obtained; (13)将步骤(3)中的直流电流信号幅值IBd *与步骤(4)中的直流电流信号幅值IBd2相加，所得结果再与步骤(7)中的零序电流注入信号Iz相加得到B相开关器件SB2的给定电流信号IB2 *，将步骤(8)中的三角载波信号滞后90°，再与B相开关器件SB2的给定电流信号IB2 *相乘，将所得结果与B相输入侧交流电流信号IB送入比较器进行比较，得到B相开关器件SB2的PWM信号PWMB2；(13) Add the DC current signal amplitude I Bd * in the step (3) to the DC current signal amplitude I Bd2 in the step (4), and add the result to the zero-sequence current injection signal in the step (7) I z is added to obtain the given current signal I B2 * of the B-phase switching device S B2 , the triangular carrier signal in step (8) is delayed by 90°, and then combined with the given current signal I B2 * of the B-phase switching device S B2 Multiply, the result obtained and the B-phase input side alternating current signal I B are sent into the comparator for comparison, and the PWM signal PWM B2 of the B-phase switching device S B2 is obtained; (14)将步骤(3)中的直流电流信号幅值IBd *与步骤(4)中的直流电流信号幅值IBd3相加，所得结果再与步骤(7)中的零序电流注入信号Iz相加得到B相开关器件SB3的给定电流信号IB3 *，将步骤(8)中的三角载波信号滞后180°，再与B相开关器件SB3的给定电流信号IB3 *相乘，将所得结果与B相输入侧交流电流信号IB送入比较器进行比较，得到B相开关器件SB3的PWM信号PWMB3；(14) Add the DC current signal amplitude I Bd * in the step (3) to the DC current signal amplitude I Bd3 in the step (4), and then add the result to the zero-sequence current injection signal in the step (7) I z is added to obtain the given current signal I B3 * of the B-phase switching device S B3 , the triangular carrier signal in step (8) is delayed by 180°, and then combined with the given current signal I B3 * of the B-phase switching device S B3 Multiply, the result obtained and the B-phase input side alternating current signal I B are sent into the comparator for comparison, and the PWM signal PWM B3 of the B-phase switching device S B3 is obtained; (15)将步骤(3)中的直流电流信号幅值IBd *与步骤(4)中的直流电流信号幅值IBd4相加，所得结果再与步骤(7)中的零序电流注入信号Iz相加得到B相开关器件SB4的给定电流信号IB4 *，将步骤(8)中的三角载波信号滞后270°，再与B相开关器件SB4的给定电流信号IB4 *相乘，将所得结果与B相输入侧交流电流信号IB送入比较器进行比较，得到B相开关器件SB4的PWM信号PWMB4；(15) Add the DC current signal amplitude I Bd * in the step (3) to the DC current signal amplitude I Bd4 in the step (4), and then add the result to the zero-sequence current injection signal in the step (7) The given current signal I B4 * of the B-phase switching device S B4 is obtained by adding I z , the triangular carrier signal in step (8) is delayed by 270°, and then combined with the given current signal I B4 * of the B-phase switching device S B4 Multiply, the result obtained and the B-phase input side alternating current signal I B are sent into the comparator for comparison, and the PWM signal PWM B4 of the B-phase switching device S B4 is obtained; (16)将步骤(3)中的直流电流信号幅值ICd *与步骤(4)中的直流电流信号幅值ICd1相加，所得结果再与步骤(7)中的零序电流注入信号Iz相加得到C相开关器件SC1的给定电流信号IC1 *，将步骤(8)中的三角载波信号与C相开关器件SC1的给定电流信号IC1 *相乘，将所得结果与C相输入侧交流电流信号IC送入比较器进行比较，得到C相开关器件SC1的PWM信号PWMC1；(16) Add the DC current signal amplitude I Cd * in step (3) to the DC current signal amplitude I Cd1 in step (4), and add the result to the zero-sequence current injection signal in step (7) The given current signal I C1 * of the C-phase switching device S C1 is obtained by adding I z , the triangular carrier signal in step (8) is multiplied by the given current signal I C1 * of the C-phase switching device S C1 , and the obtained The result is compared with the C-phase input side alternating current signal I C and sent into the comparator to obtain the PWM signal PWM C1 of the C-phase switching device S C1 ; (17)将步骤(3)中的直流电流信号幅值ICd *与步骤(4)中的直流电流信号幅值ICd2相加，所得结果再与步骤(7)中的零序电流注入信号Iz相加得到C相开关器件SC2的给定电流信号IC2 *，将步骤(8)中的三角载波信号滞后90°，再与C相开关器件SC2的给定电流信号IC2 *相乘，将所得结果与C相输入侧交流电流信号IC送入比较器进行比较，得到C相开关器件SC2的PWM信号PWMC2；(17) Add the DC current signal amplitude I Cd * in the step (3) to the DC current signal amplitude I Cd2 in the step (4), and add the result to the zero-sequence current injection signal in the step (7) The given current signal I C2 * of the C-phase switching device S C2 is obtained by adding I z , the triangular carrier signal in step (8) is delayed by 90°, and then combined with the given current signal I C2 * of the C-phase switching device S C2 Multiply, the result obtained and the C-phase input side alternating current signal I C are sent into the comparator for comparison, and the PWM signal PWM C2 of the C-phase switching device S C2 is obtained; (18)将步骤(3)中的直流电流信号幅值ICd *与步骤(4)中的直流电流信号幅值ICd3相加，所得结果再与步骤(7)中的零序电流注入信号Iz相加得到C相开关器件SC3的给定电流信号IC3 *，将步骤(8)中的三角载波信号滞后180°，再与C相开关器件SC3的给定电流信号IC3 *相乘，将所得结果与C相输入侧交流电流信号IC送入比较器进行比较，得到C相开关器件SC3的PWM信号PWMC3；(18) Add the DC current signal amplitude I Cd * in step (3) to the DC current signal amplitude I Cd3 in step (4), and add the result to the zero-sequence current injection signal in step (7) The given current signal I C3 * of the C-phase switching device S C3 is obtained by adding I z , the triangular carrier signal in step (8) is delayed by 180°, and then combined with the given current signal I C3 * of the C-phase switching device S C3 Multiply, the result obtained and the C-phase input side alternating current signal I C are sent into the comparator for comparison, and the PWM signal PWM C3 of the C-phase switching device S C3 is obtained; (19)将步骤(3)中的直流电流信号幅值ICd *与步骤(4)中的直流电流信号幅值ICd4相加，所得结果再与步骤(7)中的零序电流注入信号Iz相加得到C相开关器件SC4的给定电流信号IC4 *，将步骤(8)中的三角载波信号滞后270°，再与C相开关器件SC4的给定电流信号IC4 *相乘，将所得结果与C相输入侧交流电流信号IC送入比较器进行比较，得到C相开关器件SC4的PWM信号PWMC4；(19) Add the DC current signal amplitude I Cd * in the step (3) to the DC current signal amplitude I Cd4 in the step (4), and add the result to the zero-sequence current injection signal in the step (7) I z is added to obtain the given current signal I C4 * of the C-phase switching device S C4 , the triangular carrier signal in step (8) is delayed by 270°, and then combined with the given current signal I C4 * of the C-phase switching device S C4 Multiply, the result obtained and the C-phase input side alternating current signal I C are sent into the comparator for comparison, and the PWM signal PWM C4 of the C-phase switching device S C4 is obtained; (20)将A相、B相、C相的驱动信号送给对应的开关器件，实现了三相整流器有源功率因数校正，在电源电压变换范围较大时，也能使输入电流正弦化，同时实现对输出直流电容电压的均衡控制。(20) Send the driving signals of A-phase, B-phase and C-phase to the corresponding switching devices to realize the active power factor correction of the three-phase rectifier. When the power supply voltage conversion range is large, the input current can also be sinusoidal. At the same time, the balanced control of the output DC capacitor voltage is realized.
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