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CN110943633A - A three-level single-phase single-stage boost inverter and its control method - Google Patents

A three-level single-phase single-stage boost inverter and its control method Download PDF

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CN110943633A
CN110943633A CN201811119520.9A CN201811119520A CN110943633A CN 110943633 A CN110943633 A CN 110943633A CN 201811119520 A CN201811119520 A CN 201811119520A CN 110943633 A CN110943633 A CN 110943633A
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bridge arm
switch tube
diode
inductor
stage boost
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CN110943633B (en
Inventor
盛万兴
吴鸣
吕志鹏
孙丽敬
宋振浩
赵婷
刘国宇
郑楠
雷达
肖莹
王金浩
樊瑞
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Shanxi Electric Power Co Ltd
China Electric Power Research Institute Co Ltd CEPRI
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Shanxi Electric Power Co Ltd
China Electric Power Research Institute Co Ltd CEPRI
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
    • H02M7/42—Conversion of DC power input into AC power output without possibility of reversal
    • H02M7/44—Conversion of DC power input into AC power output without possibility of reversal by static converters
    • H02M7/48—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/483—Converters with outputs that each can have more than two voltages levels
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
    • H02M7/42—Conversion of DC power input into AC power output without possibility of reversal
    • H02M7/44—Conversion of DC power input into AC power output without possibility of reversal by static converters
    • H02M7/48—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)

Abstract

本发明提供一种三电平单相单级升压逆变器及其控制方法，第一电感(L1)、电源(Uin)、第一桥臂和第二桥臂；所述电源的正极与所述第一电感(L1)连接构成串联电路；所述第一桥臂和第二桥臂连接后与所述第一电感(L1)和电源(Uin)串联的电路连接，用于接收电压控制信号；所述第一桥臂和第二桥臂分别包括多个开关管；通过各桥臂开关管的一个开关周期使三电平单相单级升压逆变器输出5个电压，所述5个电压构成交流电压的一个波形，使所述三电平单相单级升压逆变器输出交流电压每个桥臂输出电压可以得到三个电平，与两电平逆变器相比，其输出电压的谐波含量可以大幅度降低，从而能够减小输出滤波元件，提高波形质量。

Figure 201811119520

The invention provides a three-level single-phase single-stage boost inverter and a control method thereof, comprising a first inductor (L 1 ), a power supply (U in ), a first bridge arm and a second bridge arm; The positive pole is connected to the first inductor (L 1 ) to form a series circuit; the first bridge arm and the second bridge arm are connected to the circuit in series with the first inductor (L 1 ) and the power supply (U in ), It is used to receive voltage control signals; the first bridge arm and the second bridge arm respectively include a plurality of switch tubes; through one switching cycle of the switch tubes of each bridge arm, the three-level single-phase single-stage boost inverter outputs 5 The 5 voltages constitute a waveform of the AC voltage, so that the output AC voltage of the three-level single-phase single-stage boost inverter can obtain three levels of the output voltage of each bridge arm, which is different from the two-level voltage. Compared with the inverter, the harmonic content of the output voltage can be greatly reduced, which can reduce the output filter element and improve the waveform quality.

Figure 201811119520

Description

Three-level single-phase single-stage boost inverter and control method thereof
Technical Field
The invention relates to the technical field of power electronic converters, in particular to a three-level single-phase single-stage boost inverter and a control method thereof.
Background
Inverters are a core component of photovoltaic power generation systems. In order to adapt to the characteristic of wide output voltage variation range of a photovoltaic array, a two-stage structure of a Boost converter cascaded voltage type full-bridge inverter is generally adopted by a photovoltaic inverter. However, the conversion efficiency of a two-stage system is relatively low. In addition, because the structure does not contain a high-frequency or low-frequency transformer, the high-frequency switching of the power tube can cause the ground capacitance of the photovoltaic cell panel to generate high-frequency common-mode voltage, so that large high-frequency leakage current is formed, and the safety of equipment and personnel is endangered. The single-phase three-level Z-source inverter can well solve the problems. However. The number of power devices and passive devices is large, and the cost is high. Complex control, insufficient boosting capacity and the like.
Disclosure of Invention
In order to solve the above-mentioned deficiency existing in the prior art, the invention provides a three-level single-phase single-stage boost inverter, comprising: first inductance (L)1) And a power supply (U)in) The bridge comprises a first bridge arm and a second bridge arm;
the positive pole of the power supply and the first inductance (L)1) Connected to form a series circuit;
the first bridge arm and the second bridge arm are connected to the first inductor (L)1) And a power supply (U)in) A series circuit connection for receiving a voltage control signal;
the first bridge arm and the second bridge arm respectively comprise a plurality of switching tubes; and enabling the three-level single-phase single-stage boost inverter to output five voltages through one switching period of each bridge arm switching tube, wherein the five voltages form one waveform of alternating-current voltage.
Preferably, the first leg includes: a first diode (D)1) A seventh diode (D)7) The bridge arm comprises a first bridge arm upper bridge arm and a first bridge arm lower bridge arm;
the first upper leg includes: a first switch tube (S)1) And a second switch tube (S)2)；
The first switch tube (S)1) And the second switching tube (S)2) The positive electrode of (1) is connected;
the first leg lower leg includes: third switch tube (S)3) And a fourth switching tube (S)4)；
The third switching tube (S)3) And the fourth switching tube (S)4) The positive electrode of (1) is connected;
the second switch tube (S)2) Negative electrode and the third switching tube (S)3) Connecting the positive electrode;
the first diode (D)1) And the first inductor (L)1) Connected, the first diode (D)1) The cathode of the first bridge arm is connected with the midpoint of the upper bridge arm of the first bridge arm;
the seventh diode (D)7) Is connected with the midpoint of the lower arm of the first arm, and the seventh diode (D)7) Is connected with the negative pole of the power supply.
Preferably, the second leg includes: second diode (D)2) An eighth diode (D)8) The upper bridge arm and the lower bridge arm of the second bridge arm;
the second upper leg includes: fifth switch tube (S)5) And a sixth switching tube (S)6)；
The fifth switch tube (S)5) And the sixth switching tube (S)6) The positive electrode of (1) is connected;
the second leg lower leg includes: seventh switch tube (S)7) And an eighth switching tube (S)8)；
The seventh switching tube (S)7) And the eighth switching tube (S)8) The positive electrode of (1) is connected;
the sixth switching tube (S)6) Negative electrode and the seventh switching tube (S)7) The positive electrode of (1) is connected;
the first switch tube (S)1) A positive electrode and the fifth switching tube (S)5) Connecting the positive electrode;
the fourth switch tube (S)4) Negative pole and the eighth switching tube (S)8) Connecting the negative electrodes;
the second diode (D)2) And the first inductor (L)1) Connected, the second diode (D)2) The cathode of the second bridge arm is connected with the midpoint of the upper bridge arm of the second bridge arm;
the eighth diode (D)8) The anode of the second bridge arm is connected with the midpoint of the lower bridge arm of the second bridge arm; the eighth diode (D)8) Is connected to the negative pole of the power supply.
Preferably, the inverter further includes: a first capacitor (C)1) A second capacitor (C)2) A third diode (D)3) A fourth diode (D)4) A fifth diode (D)5) And a sixth diode (D)6) And a filter;
the first capacitor (C)1) And said second capacitor (C)2) Is connected to said first capacitor (C)1) And the other end of the first switching tube (S)1) And the fifth switching tube (S)5) Is connected to the second capacitor (C)2) And the other end of the fourth switching tube (S)4) And the eighth switching tube (S)8) The connection point of the negative electrode is connected;
the third diode (D)3) And the fourth diode (D)4) The cathode of (a) is connected; the third diode (D)3) The cathode of the first bridge arm is connected with the midpoint of the upper bridge arm of the first bridge arm; the fourth diode (D)4) The anode of the first bridge arm is connected with the midpoint of the lower bridge arm of the first bridge arm;
the fifth diode (D)5) And the sixth diode (D)6) The cathode of (a) is connected; the fifth diode (D)5) The cathode of the second bridge arm is connected with the midpoint of the upper bridge arm of the second bridge arm; the sixth diode (D)6) The anode of the second bridge arm is connected with the midpoint of the lower bridge arm of the second bridge arm;
one end of the filter is connected with the midpoint of the first bridge arm, and the other end of the filter is connected with the midpoint of the second bridge arm.
Preferably, the filter comprises a second inductor (L)2) An output capacitor (C)0) And a load resistance (R)0)；
The second inductance (L)2) Is connected with the midpoint of the first bridge arm, a second inductance (L)2) And the other end of (C) and the output capacitor (C)0) Is connected to the first terminal of the output capacitor (C)0) Is connected to the midpoint of the second leg, the load resistance (R)0) Same output capacitor (C)0) Are connected in parallel.
Preferably, the first capacitance (C)1) And a second capacitance (C)2) Are equal in size.
A method of controlling a three-level single-phase single-stage boost inverter, the method comprising:
acquiring a control signal of required voltage;
a first bridge arm and a second bridge arm of the three-level single-phase single-stage boost inverter control switching tubes of the first bridge arm and the second bridge arm based on the acquired control signals of the required voltage, so that the three-level single-phase single-stage boost inverter works in one switching period;
and enabling a power supply to charge or discharge the first inductor based on five working modes in the switching period, so that the three-level single-phase single-stage boost inverter outputs alternating-current voltage.
Preferably, the obtaining of the control signal of the required voltage includes:
acquiring two isosceles triangular waves and sine waves which are in the same phase and have the same amplitude based on the voltage;
modulating the isosceles triangle wave and the sine wave to obtain positive and negative groups of SPWM control signals;
and modulating the isosceles triangular wave and the sine wave in a reversed phase manner to obtain the other positive and negative SPWM control signals.
Preferably, the five working modes in one switching cycle include:
a first mode of operation: a second switching tube (S) for connecting the first bridge arm2) And a third switching tube (S)3) And a sixth switching tube (S) of the second bridge arm6) And a seventh switching tube (S)7) For the first inductance (L)1) Charging is carried out;
a second working mode: a third switching tube (S) for connecting the first bridge arm3) And a fourth switching tube (D)4) A fifth switching tube (D) of the second bridge arm5) And a sixth switching tube (D)6) For the first inductance (L)1) Discharging;
the third working mode is as follows: a third switching tube (S) for connecting the first bridge arm3) And a fourth switching tube (S)4) And a sixth switching tube (S) of the second bridge arm6) And a seventh switching tube (S)7) For the first inductance (L)1) IntoLine charging;
the fourth working mode: a first switching tube (S) for connecting the first bridge arm1) And a second switching tube (S)2) A seventh switching tube (S) of the second bridge arm7) And an eighth switching tube (S)8) For the first inductance (L)1) Discharging;
a fifth working mode: a first switching tube (S) for connecting the first bridge arm1) And a second switching tube (S)2) And a sixth switching tube (S) of the second bridge arm6) And a seventh switching tube (S)7) For the first inductance (L)1) And charging is carried out.
Preferably, the charging or discharging the first inductor based on five working modes in the one switching cycle to enable the three-level single-phase single-stage boost inverter to output the ac voltage includes:
enabling the first inductor of the three-level single-phase single-stage boost inverter to alternately work in a charging state and a discharging state based on five working modes in one switching period;
enabling the three-level single-phase single-stage boost inverter to obtain 5 different levels in sequence based on the fact that the first inductor works in a charging state and a discharging state alternately;
the three-level single-phase single-stage boost inverter outputs an alternating-current voltage based on the 5 different levels.
Compared with the prior art, the invention has the following beneficial effects:
1. three-level single-phase single-stage boost inverter, control method and system thereof, and first inductor (L)1) And a power supply (U)in) The bridge comprises a first bridge arm and a second bridge arm; the positive pole of the power supply and the first inductance (L)1) Connected to form a series circuit; the first bridge arm and the second bridge arm are connected to the first inductor (L)1) And a power supply (U)in) A series circuit connection for receiving a voltage control signal; the first bridge arm and the second bridge arm respectively comprise a plurality of switching tubes; enabling the three-level single-phase single-stage boost inverter to output five voltages through one switching period of each bridge arm switching tube, wherein the five voltages form a waveform of alternating-current voltage, and the three-level single-phase single-stage boost inverter is enabled to output five voltages through one switching period of each bridge arm switching tubeThe three-level single-phase single-stage boost inverter outputs alternating-current voltage, each bridge arm can obtain three levels of output voltage, and compared with a two-level inverter, the harmonic content of the output voltage can be greatly reduced, so that output filter elements can be reduced, and the waveform quality is improved.
2. Three-level single-phase single-stage boost inverter and control method and system thereof, wherein four switching tubes S1、S4、S5、S8The voltage stress of the direct current bus is reduced to half of the voltage of the direct current bus; the function originally realized by the two-stage power conversion is realized by the one-stage power conversion, the cost is reduced, and the system integration level is improved.
3. A three-level single-phase single-stage boost inverter and a control method and a system thereof are provided, wherein a two-stage structure needs to simultaneously realize the neutral point voltage clamping and other control of a front stage and a rear stage, the control structure is very complex, the single-phase three-level boost inverter only needs to realize the control of one-stage power conversion, and the control structure is simpler.
Description of the drawings:
FIG. 1 is a schematic diagram of a converter and its TL topology of the present invention;
FIG. 2 is an equivalent circuit diagram of a first mode of operation according to the present invention;
FIG. 3 is an equivalent circuit diagram of a second mode of operation according to the present invention;
FIG. 4 is an equivalent circuit diagram of a third mode of operation according to the present invention;
FIG. 5 is an equivalent circuit diagram of a fourth mode of operation according to the present invention;
FIG. 6 is an equivalent circuit diagram of a fifth mode of operation according to the present invention;
FIG. 7 is a waveform diagram of a carrier wave, modulated by a unipolar SPWM employed in the present invention;
FIG. 8 is a waveform diagram of the output simulation under unipolar SPWM modulation in accordance with the present invention.
The specific implementation mode is as follows:
for a better understanding of the present invention, reference is made to the following description taken in conjunction with the accompanying drawings and examples, in which:
example 1
A three-level single-phase single-stage boost inverter as shown in fig. 1, comprising: first inductance (L)1) And a power supply (U)in) The bridge comprises a first bridge arm and a second bridge arm;
the positive pole of the power supply and the first inductance (L)1) Connected to form a series circuit;
the first bridge arm and the second bridge arm are connected to the first inductor (L)1) And a power supply (U)in) A series circuit connection for receiving a voltage control signal;
the first bridge arm and the second bridge arm respectively comprise a plurality of switching tubes; and enabling the three-level single-phase single-stage boost inverter to output 5 voltages through one switching period of each bridge arm switching tube, wherein the 5 voltages form one waveform of alternating-current voltage.
The first leg includes: a first diode (D)1) A seventh diode (D)7) The bridge arm comprises a first bridge arm upper bridge arm and a first bridge arm lower bridge arm;
the first upper leg includes: a first switch tube (S)1) And a second switch tube (S)2)；
The first switch tube (S)1) And the second switching tube (S)2) The positive electrode of (1) is connected;
the first leg lower leg includes: third switch tube (S)3) And a fourth switching tube (S)4)；
The third switching tube (S)3) And the fourth switching tube (S)4) The positive electrode of (1) is connected;
the second switch tube (S)2) Negative electrode and the third switching tube (S)3) Connecting the positive electrode;
the first diode (D)1) And the first inductor (L)1) Connected, the first diode (D)1) The cathode of the first bridge arm is connected with the midpoint of the upper bridge arm of the first bridge arm;
the seventh diode (D)7) Is connected with the midpoint of the lower arm of the first arm, and the seventh diode (D)7) Is connected with the negative pole of the power supply。
The second leg includes: second diode (D)2) An eighth diode (D)8) The upper bridge arm and the lower bridge arm of the second bridge arm;
the second upper leg includes: fifth switch tube (S)5) And a sixth switching tube (S)6)；
The fifth switch tube (S)5) And the sixth switching tube (S)6) The positive electrode of (1) is connected;
the second leg lower leg includes: seventh switch tube (S)7) And an eighth switching tube (S)8)；
The seventh switching tube (S)7) And the eighth switching tube (S)8) The positive electrode of (1) is connected;
the sixth switching tube (S)6) Negative electrode and the seventh switching tube (S)7) The positive electrode of (1) is connected;
the first switch tube (S)1) A positive electrode and the fifth switching tube (S)5) Connecting the positive electrode;
the fourth switch tube (S)4) Negative pole and the eighth switching tube (S)8) Connecting the negative electrodes;
the second diode (D)2) And the first inductor (L)1) Connected, the second diode (D)2) The cathode of the second bridge arm is connected with the midpoint of the upper bridge arm of the second bridge arm;
the eighth diode (D)8) The anode of the second bridge arm is connected with the midpoint of the lower bridge arm of the second bridge arm; the eighth diode (D)8) Is connected to the negative pole of the power supply.
The inverter further includes: a first capacitor (C)1) A second capacitor (C)2) A third diode (D)3) A fourth diode (D)4) A fifth diode (D)5) And a sixth diode (D)6) And a filter;
the first capacitor (C)1) And said second capacitor (C)2) Is connected to said first capacitor (C)1) And the other end of the first switching tube (S)1) And saidFifth switch tube (S)5) Is connected to the second capacitor (C)2) And the other end of the fourth switching tube (S)4) And the eighth switching tube (S)8) The connection point of the negative electrode is connected;
the third diode (D)3) And the fourth diode (D)4) The cathode of (a) is connected; the third diode (D)3) The cathode of the first bridge arm is connected with the midpoint of the upper bridge arm of the first bridge arm; the fourth diode (D)4) The anode of the first bridge arm is connected with the midpoint of the lower bridge arm of the first bridge arm;
the fifth diode (D)5) And the sixth diode (D)6) The cathode of (a) is connected; the fifth diode (D)5) The cathode of the second bridge arm is connected with the midpoint of the upper bridge arm of the second bridge arm; the sixth diode (D)6) The anode of the second bridge arm is connected with the midpoint of the lower bridge arm of the second bridge arm;
one end of the filter is connected with the midpoint of the first bridge arm, and the other end of the filter is connected with the midpoint of the second bridge arm.
The filter comprises a second inductor (L)2) An output capacitor (C)0) And a load resistance (R)0)；
The second inductance (L)2) Is connected with the midpoint of the first bridge arm, a second inductance (L)2) And the other end of (C) and the output capacitor (C)0) Is connected to the first terminal of the output capacitor (C)0) Is connected to the midpoint of the second leg, the load resistance (R)0) Same output capacitor (C)0) Are connected in parallel.
The first capacitor (C)1) And a second capacitance (C)2) Are equal in size.
Example 2
Comprises a power supply UinFirst inductance L1A first diode D1The seventh diode D7A first switch tube S1A second switch tube S2A third switch tube S3And a fourth switching tube S4A third diode D3A fourth diode D4A first capacitor C1A second capacitor C2A fifth diode D5A sixth diode D6The fifth switch tube S5The sixth switching tube S6Seventh switching tube S7The eighth switching tube S8A second diode D2The eighth polar tube D8A second inductor L1An output capacitor C0Load resistance R0。
The power supply UinPositive pole and first inductance L1Is connected to the first terminal of the first inductor L1Second terminal and first diode D1Is connected to the anode of the second diode D2Is connected with the anode of the first switching tube S1A second switch tube S2A third switch tube S3And a fourth switching tube S4A first bridge arm and a first diode D connected in series1Cathode of (2), third diode D3The cathode of (1) and the midpoint of the upper arm of the first bridge arm (first switching tube S)1And a second switching tube S2Of the seventh diode D), the seventh diode D7Anode of (2), fourth diode D4And the middle point of the lower bridge arm of the first bridge arm (third switching tube S)3And a fourth switching tube S4Of the seventh diode D), the seventh diode D7Is connected to the negative pole of the input voltage source.
The first capacitor C1And a second capacitor C2Is a voltage-dividing capacitor with large capacitance value for stabilizing the voltage at two ends of the bridge arm, and a first capacitor C1And a second capacitor C2Connected in series, the first capacitor C being in normal operation1And a second capacitor C2Both ends are equalized and connected in series C1、C2Is connected in parallel with the first leg. The third diode D3Anode of (2), fourth diode D4Cathode of (1), fifth diode D5Anode of (2), sixth diode D6The cathode and the first capacitor C1And a second capacitor C2The midpoints of the series are connected.
The fifth switch tube S5The sixth switching tube S6Seventh switching tube S7The eighth switching tube S8Are connected in series to form a second bridge armFifth diode D5Cathode of (2), second diode D2The cathode of the first bridge arm and the midpoint of the upper bridge arm of the second bridge arm (the fifth switching tube S)5And a sixth switching tube S6The connection point of) and the sixth diode D6Anode of (2), eighth diode D8Anode of (1) and midpoint of lower arm of second arm (seventh switching tube S)7And an eighth switching tube S8The connection point of) and the eighth diode D8Is connected to the negative pole of the input voltage source.
The second inductor L2And output capacitor C0Forming an LC filter, a second inductor L2Is connected to the midpoint of the first bridge arm (second switch tube S)2And a third switching tube S3The connection point of) on the second inductor L2Is connected to the output capacitor C0First terminal of (1), output capacitor C0Is connected to the midpoint of the second bridge arm (sixth switching tube S)6And a seventh switching tube S7The connection point of) on the load resistor R, the load resistor R0Same output capacitor C0Are connected in parallel with an output capacitor C0The two ends of the three-level boost inverter are the alternating current output ends of the three-level boost inverter.
Further, the switch tube S1And S3、S2And S4、S5And S7、S6And S8Are complementary to each other.
Example 3
The working principle and characteristics of the three-level single-phase single-stage boost inverter are analyzed in detail below, in order to simplify the analysis process, the following basic assumptions are made firstly that ① all power tubes and filter elements are ideal devices, and ② voltage-sharing capacitor C1、C2Large enough to ignore its ripple, so there is Uc1＝Uc2③ fourth switch tube S4A second capacitor C2And an eighth switching tube S8The potential of the junction point O of (2) is 0.
The method comprises the following steps: acquiring a control signal of required voltage;
step two: a first bridge arm and a second bridge arm of the three-level single-phase single-stage boost inverter control switching tubes of the first bridge arm and the second bridge arm based on the acquired control signals of the required voltage, so that the three-level single-phase single-stage boost inverter works in one switching period;
step three: and enabling a power supply to charge or discharge the first inductor based on five working modes in the switching period, so that the three-level single-phase single-stage boost inverter outputs alternating-current voltage.
Based on the above assumptions, the operation process of the converter in one switching period in the steady state is divided into 5 modes, and each mode corresponds to an equivalent circuit.
The method comprises the following steps: acquiring a control signal of required voltage;
the switch tube S1～S8A Sinusoidal Pulse Width Modulation (SPWM) control strategy is adopted, and specifically, two isosceles triangular waves with the same phase and the same amplitude are used as carrier waves, and positive and negative phase waveforms of a sinusoidal wave obtained by a controller are used as modulation waves. The normal phase modulation wave and the carrier wave are intersected to obtain one group of SPWM control signals, and the other group of SPWM control signals are obtained after inversion; and similarly, the inverse modulation wave and the carrier wave are intersected to obtain the other two groups of SPWM control signals.
Step two: a first bridge arm and a second bridge arm of the three-level single-phase single-stage boost inverter control switching tubes of the first bridge arm and the second bridge arm based on the acquired control signals of the required voltage, so that the three-level single-phase single-stage boost inverter works in one switching period;
the working mode 1, the equivalent circuit is shown in fig. 2: the second switch tube, the third switch tube, the sixth switch tube and the seventh switch tube are all turned on, and the first switch tube, the fourth switch tube, the fifth switch tube and the eighth switch tube are all turned off. At this time, the inductance L1Terminal voltage of Uin-UD1-UD7> 0 (or U)in-UD2-UD8> 0), DC voltage source through D1，D7And D2，D8Charging the inductor L on the DC side1The current in (1) rises linearly, at this time Ua＝Ub＝UC1。
The working mode 2, the equivalent circuit is shown in fig. 3: the third switching tube, the fourth switching tube, the fifth switching tube and the sixth switching tube are switched on, and the first switching tube, the second switching tube, the seventh switching tube and the eighth switching tube are switched off. At this time, the voltage dividing capacitor C2，C1Voltages at both ends are applied to the diode D in reverse directions4，D5Cutting off the two ends of the tube; inductor L1Terminal voltage of Uin-2UC1< 0, inductance L1The current in the power supply is linearly reduced, and the power supply and the inductor are connected in series and simultaneously supply power to the load; voltage dividing capacitor C1，C2Discharging in series to supply energy to the load side; u shapea＝0，Ub＝2UC1。
The working mode 3, the equivalent circuit is shown in fig. 4: the third switching tube, the fourth switching tube, the sixth switching tube and the seventh switching tube are switched on, and the first switching tube, the second switching tube, the fifth switching tube and the eighth switching tube are switched off. At this time, the inductance L1Terminal voltage of Uin-UD2-UD8> 0, DC power supply through D2，D8Charging the inductor L on the DC side1The current in (1) rises linearly; voltage dividing capacitor C2Discharging to supply energy to the load side; u shapea＝0，Ub＝UC2＝UC1。
The working mode 4, the equivalent circuit is shown in fig. 5: the first switching tube, the second switching tube, the seventh switching tube and the eighth switching tube are switched on, and the third switching tube, the fourth switching tube, the fifth switching tube and the sixth switching tube are switched off. At this time, the inductance L1Terminal voltage of Uin-2UC1< 0, inductance L1The current in the power supply is linearly reduced, and the power supply and the inductor are connected in series to supply power to the load at the same time; voltage dividing capacitor C1，C2Discharging in series to supply energy to the load side; u shapea＝2UC1，Ub＝0。
The working mode 5, the equivalent circuit is shown in fig. 6: the first switching tube, the second switching tube, the sixth switching tube and the seventh switching tube are switched on, and the third switching tube, the fourth switching tube, the fifth switching tube and the eighth switching tube are switched off. At this time, the inductance L1Terminal voltage of Uin-UD2-UD8> 0, DC power supply through D2，D8Charging the inductor L on the DC side1The current in (1) rises linearly; voltage dividing capacitor C1Discharging to supply energy to the load side; u shapea＝2UC1，Ub＝UC2＝UC1。
Step three: and enabling a power supply to charge or discharge the first inductor based on five working modes in the switching period, so that the three-level single-phase single-stage boost inverter outputs alternating-current voltage.
Through the analysis of the switching modes, the point a and the point b of the three-level single-phase single-stage boost inverter can obtain 0, U in one switching periodC1，2UC1Three levels. Inductor L at DC source side1Alternately operating in a charging state and a discharging state by means of a first inductor L1The voltage is increased by the charging and discharging.
In order to verify the correctness of theoretical analysis, saber simulation software is used for simulation verification, and the design indexes are as follows: switching frequency of 10kHz, and DC input voltage Uin48V, and the output AC voltage amplitude Uo.peak146V, filter inductance L1＝8mH，L21mH, voltage-dividing capacitor C1＝C24000 muF, filter capacitance Co＝5μF，S1～S8Using IRFP460, D1～D8S30L60 was used.
As can be seen from analyzing the simulation waveform diagram 7, only the voltage stress of the first switching tube and the fourth switching tube on the first bridge arm of the three-level single-phase single-stage boost inverter is reduced to half of the voltage stress of the direct-current bus, which is half of the voltage stress of the conventional two-level inverter. However, the voltage stress of the second switching tube and the third switching tube is still equal to the voltage of the direct current bus, which is also a defect of the invention. In addition, U can also be seenabat-UC1、-2UC1、0、UC1And 2UC1The five levels are periodically changed, and the boost multiple of the converter can be more than doubled. The results and theory of these experimentsThe theoretical analysis is completely consistent, so that the correctness of the theoretical analysis of the three-level single-phase single-stage boost inverter is proved.
The invention provides a novel three-level single-phase single-stage boost inverter. The working principle and the characteristics of the device are analyzed in detail, and Saber software is used for simulation verification. As shown in fig. 8, the research result shows that the three-level single-phase single-stage boost inverter has the first switching tube S compared with the common two-level inverter under the same condition1And a fourth switching tube S4The fifth switch tube S5The eighth switching tube S8The voltage stress of the second switch tube S is reduced to half of the voltage of the direct current bus side2A third switch tube S3The sixth switching tube S6Seventh switching tube S7The voltage stress of the voltage is the voltage of a direct current bus; the output voltage of each bridge arm can obtain 0, UC1，2UC1Three levels; the boost multiple of the converter can reach more than two times. The above conclusions confirm the correctness of the three-level single-phase single-stage boost inverter topology.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and block diagrams of methods, systems, and computer program products according to embodiments of the application. It will be understood that each flow and block of the flow diagrams and block diagrams, and combinations of flows and blocks in the flow diagrams and block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and block diagram block or blocks.
The present invention is not limited to the above embodiments, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention are included in the scope of the claims of the present invention which are filed as the application.

Claims (10)

1.一种三电平单相单级升压逆变器，其特征在于，包括：第一电感(L1)、电源(Uin)、第一桥臂和第二桥臂；1. A three-level single-phase single-stage boost inverter, characterized in that it comprises: a first inductor (L 1 ), a power supply (U in ), a first bridge arm and a second bridge arm; 所述电源的正极与所述第一电感(L1)连接构成串联电路；The positive pole of the power supply is connected with the first inductor (L 1 ) to form a series circuit; 所述第一桥臂和第二桥臂连接后与所述第一电感(L1)和电源(Uin)串联的电路连接，用于接收电压控制信号；The first bridge arm and the second bridge arm are connected to a circuit in series with the first inductor (L 1 ) and the power supply (U in ), for receiving a voltage control signal; 所述第一桥臂和第二桥臂分别包括多个开关管；通过各桥臂开关管的一个开关周期使三电平单相单级升压逆变器输出五个电压，所述五个电压构成交流电压的一个波形。The first bridge arm and the second bridge arm respectively include a plurality of switch tubes; through one switching cycle of the switch tubes of each bridge arm, the three-level single-phase single-stage boost inverter outputs five voltages, and the five Voltage constitutes a waveform of AC voltage. 2.如权利要求1所述的一种三电平单相单级升压逆变器，其特征在于，所述第一桥臂，包括：第一二极管(D1)、第七二极管(D7)、第一桥臂上桥臂和第一桥臂下桥臂；2 . The three-level single-phase single-stage boost inverter according to claim 1 , wherein the first bridge arm comprises: a first diode (D 1 ), a seventh-second a pole tube (D 7 ), an upper bridge arm of the first bridge arm and a lower bridge arm of the first bridge arm; 所述第一桥臂上桥臂包括：第一开关管(S1)与第二开关管(S2)；The upper bridge arm of the first bridge arm includes: a first switch tube (S 1 ) and a second switch tube (S 2 ); 所述第一开关管(S1)的负极与所述第二开关管(S2)的正极连接；The negative pole of the first switch tube (S 1 ) is connected to the positive pole of the second switch tube (S 2 ); 所述第一桥臂下桥臂包括：第三开关管(S3)和第四开关管(S4)；The lower bridge arm of the first bridge arm includes: a third switch tube (S 3 ) and a fourth switch tube (S 4 ); 所述第三开关管(S3)的负极与所述第四开关管(S4)的正极连接；The negative pole of the third switch tube (S 3 ) is connected to the positive pole of the fourth switch tube (S 4 ); 所述第二开关管(S2)负极与所述第三开关管(S3)正极连接；The negative pole of the second switch tube (S 2 ) is connected to the positive pole of the third switch tube (S 3 ); 所述第一二极管(D1)的阳极与所述第一电感(L1)连接，所述第一二极管(D1)的阴极与所述第一桥臂上桥臂的中点连接；The anode of the first diode (D 1 ) is connected to the first inductor (L 1 ), and the cathode of the first diode (D 1 ) is connected to the middle of the upper bridge arm of the first bridge arm. point connection; 所述第七二极管(D7)的阳极与所述第一桥臂下桥臂的中点连接，所述第七二极管(D7)的阴极与所述电源负极连接。The anode of the seventh diode (D 7 ) is connected to the midpoint of the lower bridge arm of the first bridge arm, and the cathode of the seventh diode (D 7 ) is connected to the negative electrode of the power supply. 3.如权利要求2所述的一种三电平单相单级升压逆变器，其特征在于，所述第二桥臂，包括：第二二极管(D2)、第八二极管(D8)、第二桥臂上桥臂和第二桥臂下桥臂；3 . The three-level single-phase single-stage boost inverter according to claim 2 , wherein the second bridge arm comprises: a second diode (D 2 ), an eighth-second a pole tube (D 8 ), an upper bridge arm of the second bridge arm and a lower bridge arm of the second bridge arm; 所述第二桥臂上桥臂包括：第五开关管(S5)和第六开关管(S6)；The upper bridge arm of the second bridge arm includes: a fifth switch tube (S 5 ) and a sixth switch tube (S 6 ); 所述第五开关管(S5)的负极与所述第六开关管(S6)的正极连接；The negative pole of the fifth switch tube (S 5 ) is connected to the positive pole of the sixth switch tube (S 6 ); 所述第二桥臂下桥臂包括：第七开关管(S7)和第八开关管(S8)；The lower bridge arm of the second bridge arm includes: a seventh switch tube (S 7 ) and an eighth switch tube (S 8 ); 所述第七开关管(S7)的负极与所述第八开关管(S8)的正极连接；The negative pole of the seventh switch tube (S 7 ) is connected to the positive pole of the eighth switch tube (S 8 ); 所述第六开关管(S6)负极与所述第七开关管(S7)的正极连接；The negative pole of the sixth switch tube (S 6 ) is connected to the positive pole of the seventh switch tube (S 7 ); 所述第一开关管(S1)正极与所述第五开关管(S5)正极连接；The positive pole of the first switch tube (S 1 ) is connected to the positive pole of the fifth switch tube (S 5 ); 所述第四开关管(S4)负极与所述第八开关管(S8)负极连接；The negative electrode of the fourth switch tube (S 4 ) is connected to the negative electrode of the eighth switch tube (S 8 ); 所述第二二极管(D2)的阳极与所述第一电感(L1)连接，所述第二二极管(D2)的阴极与所述第二桥臂上桥臂中点连接；The anode of the second diode (D 2 ) is connected to the first inductor (L 1 ), and the cathode of the second diode (D 2 ) is connected to the midpoint of the upper bridge arm of the second bridge arm connect; 所述第八二极管(D8)的阳极与所述第二桥臂下桥臂的中点连接；所述第八二极管(D8)的阴极与所述电源的负极连接。The anode of the eighth diode (D 8 ) is connected to the midpoint of the lower bridge arm of the second bridge arm; the cathode of the eighth diode (D 8 ) is connected to the negative electrode of the power supply. 4.如权利要求3所述的三电平单相单级升压逆变器，其特征在于，所述逆变器还包括：第一电容(C1)、第二电容(C2)、第三二极管(D3)、第四二极管(D4)、第五二极管(D5)、第六二极管(D6)和滤波器；4. The three-level single-phase single-stage boost inverter according to claim 3, wherein the inverter further comprises: a first capacitor (C 1 ), a second capacitor (C 2 ), a third diode ( D3 ), a fourth diode (D4), a fifth diode (D5), a sixth diode (D6) and a filter; 所述第一电容(C1)的一端与所述第二电容(C2)的一端连接，所述第一电容(C1)的另一端与所述第一开关管(S1)和所述第五开关管(S5)的连接点连接，所述第二电容(C2)的另一端与所述第四开关管(S4)和所述第八开关管(S8)负极的连接点连接；One end of the first capacitor (C 1 ) is connected to one end of the second capacitor (C 2 ), and the other end of the first capacitor (C 1 ) is connected to the first switch tube (S 1 ) and the The connection point of the fifth switch tube (S 5 ) is connected, and the other end of the second capacitor (C 2 ) is connected to the negative poles of the fourth switch tube (S 4 ) and the eighth switch tube (S 8 ). connection point connection; 所述第三二极管(D3)的阳极与所述第四二极管(D4)的阴极连接；所述第三二极管(D3)的阴极与所述第一桥臂上桥臂的中点连接；所述第四二极管(D4)的阳极与所述第一桥臂下桥臂的中点连接；The anode of the third diode (D 3 ) is connected to the cathode of the fourth diode (D 4 ); the cathode of the third diode (D 3 ) is connected to the first bridge arm The midpoint of the bridge arm is connected; the anode of the fourth diode (D 4 ) is connected to the midpoint of the lower bridge arm of the first bridge arm; 所述第五二极管(D5)的阳极与所述第六二极管(D6)的阴极连接；所述第五二极管(D5)的阴极与所述第二桥臂上桥臂中点连接；所述第六二极管(D6)的阳极与所述第二桥臂下桥臂的中点连接；The anode of the fifth diode (D 5 ) is connected to the cathode of the sixth diode (D 6 ); the cathode of the fifth diode (D 5 ) is connected to the second bridge arm The midpoint of the bridge arm is connected; the anode of the sixth diode (D 6 ) is connected to the midpoint of the lower bridge arm of the second bridge arm; 所述滤波器的一端与第一桥臂中点相连，所述滤波器的另一端与所述第二桥臂中点相连。One end of the filter is connected to the midpoint of the first bridge arm, and the other end of the filter is connected to the midpoint of the second bridge arm. 5.如权利要求4所述的一种三电平单相单级升压逆变器，其特征在于，所述滤波器，包括第二电感(L2)、输出电容(C0)与负载电阻(R0)；5. The three-level single-phase single-stage boost inverter according to claim 4, wherein the filter comprises a second inductor (L 2 ), an output capacitor (C 0 ) and a load resistance (R 0 ); 所述第二电感(L2)的一端与所述第一桥臂中点连接，第二电感(L2)的另一端与所述输出电容(C0)的第一端连接，所述输出电容(C0)的另一端与所述第二桥臂的中点连接，所述负载电阻(R0)同输出电容(C0)的两端并联。One end of the second inductor (L 2 ) is connected to the midpoint of the first bridge arm, the other end of the second inductor (L 2 ) is connected to the first end of the output capacitor (C 0 ), and the output The other end of the capacitor (C 0 ) is connected to the midpoint of the second bridge arm, and the load resistor (R 0 ) is connected in parallel with both ends of the output capacitor (C 0 ). 6.如权利要求4所述的一种三电平单相单级升压逆变器，其特征在于，所述第一电容(C1)和第二电容(C2)大小相等。6 . The three-level single-phase single-stage boost inverter according to claim 4 , wherein the first capacitor (C 1 ) and the second capacitor (C 2 ) are equal in size. 7 . 7.一种三电平单相单级升压逆变器的控制方法，其特征在于，所述方法包括：7. A control method for a three-level single-phase single-stage boost inverter, wherein the method comprises: 获取所需电压的控制信号；Obtain the control signal of the required voltage; 所述三电平单相单级升压逆变器的第一桥臂和第二桥臂基于获取到的所需电压的控制信号，控制所述第一桥臂和第二桥臂的开关管，使所述三电平单相单级升压逆变器在一个开关周期内工作；The first bridge arm and the second bridge arm of the three-level single-phase single-stage boost inverter control the switching tubes of the first bridge arm and the second bridge arm based on the obtained control signal of the required voltage , making the three-level single-phase single-stage boost inverter work within one switching cycle; 基于所述一个开关周期内的五个工作模态使电源对第一电感进行充电或放电，使所述三电平单相单级升压逆变器输出交流电压。The power supply charges or discharges the first inductor based on the five operating modes in the one switching cycle, so that the three-level single-phase single-stage boost inverter outputs an AC voltage. 8.如权利要求7所述的一种三电平单相单级升压逆变器的控制方法，其特征在于，所述获取所需电压的控制信号，包括：8 . The control method for a three-level single-phase single-stage boost inverter according to claim 7 , wherein the obtaining the control signal of the required voltage comprises: 基于所述电压获取两个同相且幅值相等的等腰三角波和正弦波；Obtaining two isosceles triangle waves and sine waves with the same phase and equal amplitude based on the voltage; 调制所述等腰三角波和正弦波得到正反两组SPWM控制信号；Modulate the isosceles triangle wave and sine wave to obtain two sets of positive and negative SPWM control signals; 反相调制所述等腰三角波和正弦波得到另外正反两组SPWM控制信号。Inversely modulate the isosceles triangle wave and sine wave to obtain another two sets of positive and negative SPWM control signals. 9.如权利要求7所述的一种三电平单相单级升压逆变器的控制方法，其特征在于，所述一个开关周期内的五个工作模态，包括：9 . The method for controlling a three-level single-phase single-stage boost inverter according to claim 7 , wherein the five operating modes in one switching cycle include: 10 . 第一工作模态：导通第一桥臂的第二开关管(S2)和第三开关管(S3)，第二桥臂的第六开关管(S6)和第七开关管(S7)，对所述第一电感(L1)进行充电；The first working mode: turn on the second switch tube (S 2 ) and the third switch tube (S 3 ) of the first bridge arm, the sixth switch tube (S 6 ) and the seventh switch tube (S 6 ) of the second bridge arm ( S 7 ), charging the first inductor (L 1 ); 第二工作模式：导通第一桥臂的第三开关管(S3)和第四开关管(D4)，第二桥臂的第五开关管(D5)和第六开关管(D6)，对所述第一电感(L1)进行放电；The second working mode: turn on the third switch tube (S 3 ) and the fourth switch tube (D 4 ) of the first bridge arm, the fifth switch tube (D 5 ) and the sixth switch tube (D ) of the second bridge arm 6 ), discharging the first inductor (L 1 ); 第三工作模式：导通第一桥臂的第三开关管(S3)和第四开关管(S4)，第二桥臂的第六开关管(S6)和第七开关管(S7)，对所述第一电感(L1)进行充电；The third working mode: turn on the third switch tube (S 3 ) and the fourth switch tube (S 4 ) of the first bridge arm, and the sixth switch tube (S 6 ) and the seventh switch tube (S ) of the second bridge arm 7 ), charging the first inductor (L 1 ); 第四工作模式：导通第一桥臂的第一开关管(S1)和第二开关管(S2)，第二桥臂的第七开关管(S7)和第八开关管(S8)，对所述第一电感(L1)进行放电；The fourth working mode: turn on the first switch tube (S 1 ) and the second switch tube (S 2 ) of the first bridge arm, and the seventh switch tube (S 7 ) and the eighth switch tube (S ) of the second bridge arm 8 ), discharging the first inductor (L 1 ); 第五工作模式：导通第一桥臂的第一开关管(S1)和第二开关管(S2)，第二桥臂的第六开关管(S6)和第七开关管(S7)，对所述第一电感(L1)进行充电。Fifth working mode: turn on the first switch tube (S 1 ) and the second switch tube (S 2 ) of the first bridge arm, the sixth switch tube (S 6 ) and the seventh switch tube (S ) of the second bridge arm 7 ), charging the first inductor (L 1 ). 10.如权利要求9所述的一种三电平单相单级升压逆变器的控制方法，其特征在于，所述基于所述一个开关周期内的五个工作模态使电源对第一电感进行充电或放电，使所述三电平单相单级升压逆变器输出交流电压，包括：10 . The method for controlling a three-level single-phase single-stage boost inverter according to claim 9 , wherein the power supply to the first power supply is based on five operating modes in the one switching cycle. 11 . An inductor is charged or discharged to make the three-level single-phase single-stage boost inverter output AC voltage, including: 基于一个开关周期内的五个工作模态使所述三电平单相单级升压逆变器第一电感交替工作在充电状态和放电状态；Make the first inductor of the three-level single-phase single-stage boost inverter work alternately in a charging state and a discharging state based on five operating modes in one switching cycle; 基于所述第一电感交替工作在充电状态和放电状态使所述三电平单相单级升压逆变器依次得到五个不同的电平；Based on the first inductor operating alternately in a charging state and a discharging state, the three-level single-phase single-stage boost inverter sequentially obtains five different levels; 基于所述五个不同的电平所述三电平单相单级升压逆变器输出交流电压。The three-level single-phase single-stage boost inverter outputs an AC voltage based on the five different levels.
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CN111600502A (en) * 2020-05-27 2020-08-28 南通大学 CCM single-bridge-arm integrated single-phase boost inverter and control method
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