CN112953237A - Ride-through switching control method and system of bidirectional DC/DC converter - Google Patents
Ride-through switching control method and system of bidirectional DC/DC converter Download PDFInfo
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- CN112953237A CN112953237A CN202110174021.5A CN202110174021A CN112953237A CN 112953237 A CN112953237 A CN 112953237A CN 202110174021 A CN202110174021 A CN 202110174021A CN 112953237 A CN112953237 A CN 112953237A
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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
- H02M3/00—Conversion of DC power input into DC power output
- H02M3/22—Conversion of DC power input into DC power output with intermediate conversion into AC
- H02M3/24—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters
- H02M3/28—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC
- H02M3/325—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/3353—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having at least two simultaneously operating switches on the input side, e.g. "double forward" or "double (switched) flyback" converter
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Abstract
本发明公开了一种双向DC/DC变换器的穿越切换控制方法及系统，提高了穿越过程中的稳定性。该穿越切换控制方法中，A、获取DC/DC变换器的调制变比系数m；B、判断m是否大于1，当结果为是时，按照原边侧内移相调节设定内移相角；当结果为否时，按照副边侧内移相调节设定内移相角；C、判断m是否属于[1‑δ，1+δ]；若是，则执行步骤D；否，则采用步骤B的原边侧内移相角和副边侧内移相角；D、计算双向DC/DC变换器的有功功率Pdc；判断|Pdc|≥Po是否成立，若成立，则执行步骤E；否，则执行步骤F；E、计算有功电流i，判断|i|≥io是否成立，若成立，则采用步骤B的内移相角；否，则执行步骤F；F、将内移相角分别更新为设定值。
The invention discloses a ride-through switching control method and system of a bidirectional DC/DC converter, which improves the stability in the ride-through process. In this crossover switching control method, A. Obtain the modulation ratio coefficient m of the DC/DC converter; B. Determine whether m is greater than 1. When the result is yes, set the internal phase shift angle according to the internal phase shift adjustment on the primary side. ; When the result is no, set the inner phase shift angle according to the inner phase shift adjustment on the secondary side; C, judge whether m belongs to [1-δ, 1+δ]; if so, execute step D; The internal phase shift angle on the primary side and the internal phase shift angle on the secondary side of B; D. Calculate the active power P dc of the bidirectional DC/DC converter; determine whether |P dc |≥P o is established, and if so, execute the steps E; No, execute step F; E, calculate active current i, and judge whether |i|≥i o is established, if so, adopt the internal phase shift angle of step B; The phase shift angle is updated to the set value respectively.
Description
Technical Field
The invention relates to a ride-through switching control method and system of a bidirectional DC/DC converter.
Background
The high-power-density double-active full-bridge bidirectional DC/DC converter can efficiently and flexibly realize the control of bidirectional flow of electric energy, and can be widely applied to systems such as electric automobiles, aerospace power supply systems, new energy renewable energy power generation and the like. The double-active full-bridge bidirectional DC/DC converter plays an important role in energy management of new energy renewable energy power generation. In the new energy renewable energy power generation, due to the fact that the power variation range is large due to instability of new energy, the double-active full-bridge bidirectional DC/DC converter can optimize the performance of a new energy renewable energy power generation system, meanwhile, feedback of redundant energy is achieved, and the utilization efficiency of electric energy is improved.
As shown in fig. 1, the main circuit of the dual-active full-bridge bidirectional DC/DC converter comprises a high-frequency transformer, an inductor (the sum of an external series inductor and a leakage inductor of the transformer), full-bridge circuits on both sides of the transformer, a capacitor and a power supply. The high-frequency transformer plays a role in electric isolation and voltage conversion, the inductor ensures the transmission of the energy of the converter, the capacitors on two sides of the transformer play a role in filtering and stabilizing the voltage, two voltage feed type full-bridge conversion units are respectively arranged at two ends of the transformer isolation transformer of the converter, and the energy flow between direct current sources is controlled by changing the drive control phase angle difference between the conversion units in the converter. The converter is operated by voltage boosting and reducing, has few filter elements and is a simple first-order stable system. The converter adopting the control type generally has no large hysteresis delay passive element, and has quick dynamic response.
The control mode of the existing double-active full-bridge bidirectional DC/DC converter mainly adopts single phase-shifting control, both ends of a leakage inductance of a high-frequency transformer are square-wave voltages with a certain phase-shifting duty ratio through the phase-shifting control, power transmission is realized through voltage difference, the size and the direction of power transmission are realized by adjusting a phase-shifting angle between a primary side bridge and a secondary side bridge, and the control is simple and convenient.
The traditional single phase-shifting control mode can only control the phase-shifting angle variable between a primary side bridge and a secondary side bridge, is simple and easy to realize closed-loop regulation, but cannot regulate the comprehensive power characteristics of a system, such as reactive power, pipe current stress and the like, so that the problems that the system has larger reactive power during light-load output, the effective value and the peak value of leakage inductance alternating current flowing through a transformer are too high, the system loss is large, the efficiency is low and the like are caused.
Correspondingly, in order to solve the above drawbacks, different multivariable control modes are proposed in succession, wherein the dual-phase-shift modulation mode not only shifts the phase angle between the primary side bridge and the secondary side bridge, but also shifts the phase in the primary side bridge or the secondary side bridge. By finding the optimal combination of the two phase shifting angles, the reactive power and the current stress of the system can be greatly reduced under the condition of ensuring certain output power, and the efficiency of the system is further greatly improved.
The current double-phase-shift modulation mode is realized by mainly adopting an inter-bridge phase-shift angle variable and generating phase shift in a primary bridge or a secondary bridge, in the practical process, the double-active full-bridge bidirectional DC/DC converter selects different internal phase-shift quantities according to m, if in a given case, when m is less than 1, the double-active full-bridge bidirectional DC/DC converter carries out internal phase-shift regulation on the secondary side, and the specific internal phase-shift is as follows: primary side internal phase shift alpha1Pi (1-m), the secondary side internally shifts the phase by alpha 20; m is more than 1, the internal phase shift of the primary side of the dual-active full-bridge bidirectional DC/DC converter is adjusted to be alpha 10, the secondary side is internally phase-shifted by alpha2＝π(1-1/m)；
However, in a dual active full-bridge bidirectional DC/DC converter, m is equal to N in the cross-overpsVdc2/Vdc1When 1, NpsThe voltage transformation ratio coefficient of the primary side and the secondary side of the double-active full-bridge bidirectional DC/DC converter can be obtained in an off-line mode, and m is calculated to be NpsVdc2/Vdc1In the actual operation process, the system modulation transformation ratio coefficient m after the conversion of the dual-active full-bridge bidirectional DC/DC converter cannot be guaranteed to be accurately calculated, so that the phase shift angle of the dual-active full-bridge bidirectional DC/DC converter has an oscillation problem, the stability of a system controller is reduced due to the fact that the phase shift angle in the primary side and the phase shift angle in the secondary side are switched back and forth in the traversing process, the performance of the system is reduced, and a switching method capable of meeting the requirement of internal phase shift traversing is urgently needed in the actual process to solve the problem of system stability caused by oscillation in the traversing process.
Disclosure of Invention
In order to solve the above technical problems, an object of the present invention is to provide a method and a system for controlling a ride-through switching of a bidirectional DC/DC converter, which improve stability during the ride-through process.
In order to achieve the purpose, the invention adopts the following technical scheme:
a ride-through switching control method of a bidirectional DC/DC converter comprises the following steps:
step A, acquiring a modulation transformation ratio coefficient m of the DC/DC converter according to the voltage of the primary side and/or the secondary side of the bidirectional DC/DC converter;
b, judging whether m is larger than 1, and if so, setting a primary side internal phase shift angle and a secondary side internal phase shift angle according to primary side internal phase shift regulation of the bidirectional DC/DC converter; if the result is negative, setting a primary side internal phase shift angle and a secondary side internal phase shift angle according to the secondary side internal phase shift regulation of the bidirectional DC/DC converter;
c, judging whether m belongs to [ 1-delta, 1+ delta ], wherein delta represents the error range of the allowable crossing modulation degree; if yes, executing the following step D; if not, adopting the primary side internal phase shift angle and the secondary side internal phase shift angle of the step B;
step D, calculating the active power P of the bidirectional DC/DC converterd(ii) a Judgment of | Pdc|≥PoWhether or not it is established, PoRepresenting that the active power is allowed to pass through a set threshold value, and if the active power is allowed to pass through the set threshold value, executing the following step E; if not, executing the following step F;
step E, calculating the active current i, and judging that | i | ≧ ioWhether or not it is established, ioRepresenting a set threshold value allowing the active current to pass through, and if the threshold value is established, adopting the primary side internal phase shift angle and the secondary side internal phase shift angle in the step B; if not, executing the following step F;
step F, updating the internal phase shift angle of the primary side and the internal phase shift angle of the secondary side to set values respectively;
step G, obtaining an outward phase shift angle according to the voltage and current of the primary side and/or the secondary side of the bidirectional DC/DC converter;
and step H, calculating one or more of a primary side reference offset phase angle, a primary side lagging bridge arm offset phase angle, a secondary side lagging leading arm offset phase angle and a secondary side lagging bridge arm offset phase angle of the bidirectional DC/DC converter according to the primary side internal phase shift angle, the secondary side internal phase shift angle and the external phase shift angle.
Preferably, m in step a is represented by the formula m ═ NpsVdc2/Vdc1Is calculated to obtain wherein Vdc1Is the primary side voltage, V, of a bidirectional DC/DC converterdc2Is the secondary side voltage, N, of a bidirectional DC/DC converterpsIs a primary side and a secondary side of a bidirectional DC/DC converterSide voltage transformation ratio coefficient.
Preferably, in the step B, when the result is yes, the primary side is internally shifted by alpha1Pi (1-m), the secondary side internally shifts the phase by alpha 20; when the result is negative, the primary side is internally phase-shifted by alpha 10, the secondary side is internally phase-shifted by alpha2＝π(1-1/m)。
Preferably, in step C, δ is 1%.
Preferably, in the step G, the system external phase shift angle is obtained through a control loop according to the voltage information and the current information of the primary side and the secondary side of the bidirectional DC/DC converter.
More preferably, the control loop comprises a voltage loop, a current loop, a power converter or a combination of a voltage loop and a current loop.
Preferably, in the step H,
primary side reference offset phase angle D 10; and/or
Offset phase angle D of primary side lagging bridge arm2＝α1(ii) a And/or
The secondary side lags the leading arm by a phase angle D3＝β+D2＝β+α1(ii) a And/or
Offset phase angle D of secondary side lagging bridge arm4＝D3+α2＝β+α1+α2＝β+α1+α2；
In the above formula, α1、α2And β represents the primary side internal phase shift angle, the secondary side internal phase shift angle and the external phase shift angle, respectively.
Preferably, the bidirectional DC/DC converter is controlled by a PWM register according to the calculation result of the step H.
The invention also adopts the following technical scheme:
a ride-through switching control system of a bidirectional DC/DC converter comprises a control unit which is carried with the ride-through switching control method.
Preferably, the ride-through switching control system further comprises a signal acquisition unit for acquiring current information of the bidirectional DC/DC converter.
Preferably, the control unit is a DSP chip, and the ride-through switching control system further includes a voltage conversion unit for converting the acquired voltage.
In the above technical solution, the bidirectional DC/DC converter is preferably a dual-active full-bridge bidirectional DC/DC converter, and the system out-phase angle β is obtained by combining voltage information and current information with a control loop. Simultaneous real-time calculation of m ═ NpsVdc2/Vdc1In which V isdc1Is the primary side voltage, V, of a double-active full-bridge bidirectional DC/DC converterdc2Is the secondary side voltage of a double-active full-bridge bidirectional DC/DC converter, NpsThe voltage transformation ratio coefficients of the primary side and the secondary side of the double-active full-bridge bidirectional DC/DC converter are used, and m is the system modulation transformation ratio coefficient after the double-active full-bridge bidirectional DC/DC converter is converted. Different internal phase shift quantities are selected by m, an internal phase shift crossing switching method is combined, the internal phase shift and the external phase shift are combined to realize double phase shift control quantity, and the double phase shift control quantity is realized by a hardware circuit, so that the internal phase shift crossing switching control result of the double-active full-bridge bidirectional DC/DC converter is realized.
Compared with the prior art, the invention has the following advantages by adopting the scheme:
the invention discloses a ride-through switching control method and system of a bidirectional DC/DC converter, which can well solve the stability problems of reduced stability of a system controller, reduced system performance and the like caused by the fact that a primary side internal phase shift angle and a secondary side internal phase shift angle are switched back and forth in the ride-through process of the system on a double-active full-bridge bidirectional DC/DC converter circuit.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a hardware circuit diagram of a bidirectional DC/DC converter;
fig. 2 is a flowchart of a cross-over handover control method according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a cross-over handover according to an embodiment of the invention.
Detailed Description
Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the advantages and features of the invention may be more readily understood by those skilled in the art. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The embodiment provides a ride-through switching control method of a bidirectional DC/DC converter, in particular to an internal phase-shift ride-through switching selection strategy of an isolated double-active full-bridge bidirectional DC/DC converter, which is an active ride-through switching phase-shift control method. Referring to fig. 2, the cross-over switching control method is implemented as follows.
And S100, starting.
S101, collecting voltage and current information of the bidirectional DC/DC converter. The current information is the current information of the primary side of the double-active full-bridge bidirectional DC/DC converter, or the current information of the secondary side, or the current information of the primary side and the secondary side; the voltage information is secondary side voltage information and primary side voltage information.
And S102, calculating a system modulation transformation ratio coefficient m after the bidirectional DC/DC converter is converted.
m＝NpsVdc2/Vdc1(ii) a Wherein Vdc1The voltage of the primary side of the double-active full-bridge bidirectional DC/DC converter is obtained; vdc2The voltage of the secondary side of the double-active full-bridge bidirectional DC/DC converter is used; n is a radical ofpsThe voltage transformation ratio coefficient of the primary side and the secondary side of the double-active full-bridge bidirectional DC/DC converter can be obtained in an off-line mode.
N of double-active full-bridge bidirectional DC/DC converterpsThe voltage transformation ratio coefficient of the primary side and the secondary side of the double-active full-bridge bidirectional DC/DC converter is mainly determined by the transformation ratio of the isolation transformer, and the value can be modified in an off-line mode.
S103, judging m > 1?
When m is less than 1, the secondary side internal phase shift regulation of the double-active full-bridge bidirectional DC/DC converter is implemented, and the specific internal phase shift is as follows: primary side internal phase shift alpha1Pi (1-m), the secondary side internally shifts the phase by alpha 20; m is more than 1, the internal phase shift of the primary side of the double-active full-bridge bidirectional DC/DC converter is adjusted, and the specific internal phase shift is as follows: primary side internal phase shift alpha 10, the secondary side is internally phase-shifted by alpha2＝π(1-1/m)。
And S104, summarizing internal phase shift angles.
If m is less than 1, setting the phase angle of the internal shift as: primary side internal phase shift alpha1Pi (1-m), the secondary side internally shifts the phase by alpha2＝0。
If m > 1, the phase angle of the internal shift is set as: primary side internal phase shift alpha 10, the secondary side is internally phase-shifted by alpha2＝π(1-1/m)。
S105, further judging m ∈ [ 1-delta, 1+ delta ]?
δ represents the allowable cross modulation error range. Specifically, in the present embodiment, δ is 1%.
If the judgment result is yes, namely m is within the range of [ 1-delta, 1+ delta ], entering S106; otherwise, the process proceeds directly to S111.
S106, calculating active power P of the double-active full-bridge bidirectional DC/DC converterdcThe value represents the active power direction by positive and negative.
S107, judging | Pdc|≥PoWhether or not this is true.
PoIndicating that the active power setting threshold is allowed to be crossed. In this example, P is selectedo＝200W。
If the above formula is true, go to S108; otherwise, the process proceeds directly to S111.
And S108, calculating active current i of the double-active full-bridge bidirectional DC/DC converter, wherein the value represents the active current direction by positive and negative.
S109, judging that | i | ≧ ioWhether or not this is true.
ioIndicating that the active current is allowed to cross the set threshold. In this embodiment, a threshold i is selected to be set for the secondary side currento＝1.8A。
If the above formula is not satisfied, enter S110; if the above equation is satisfied, the process proceeds to S111.
And S110, updating the internal phase shift angle.
Adjusting primary side internal phase shift alpha during internal phase shift crossing switching1Setting 1, and shifting alpha in the secondary side2Set value 2.
And S111, summarizing internal phase shift angles.
If the internal phase shift angle is not updated as in S110, the primary side internal phase shift α set in step S104 is used1And secondary side internal phase shift alpha2. The method specifically comprises the following steps: primary side internal phase shift alpha1Pi (1-m), the secondary side internally shifts the phase by alpha 20; or, the primary side internal phase shift alpha 10, the secondary side is internally phase-shifted by alpha2＝π(1-1/m)。
If the inner phase shift angle is updated as in S110, the inner phase shift angle updated in S110 is adopted. The method specifically comprises the following steps: primary side internal phase shift alpha1Setting 1, and shifting alpha in the secondary side2Set value 2.
And S112, calculating a system outward shift phase angle.
And according to the voltage information and the current information of the primary side and the secondary side of the dual-active full-bridge bidirectional DC/DC converter collected in the step S101, combining a control loop to obtain a system external phase shift angle beta, wherein the control loop is a voltage loop, a current loop, a voltage loop and a current loop, or a power loop, and controlling by the control loop to obtain the system external phase shift angle beta. The double-active full-bridge bidirectional DC/DC converter is realized by adopting a classical control theory or a modern control theory. The dual-active full-bridge bidirectional DC/DC converter is generally a closed-loop control system.
S113, calculating one or more of a primary side reference offset phase angle, a primary side lagging bridge arm offset phase angle, a secondary side lagging leading bridge arm offset phase angle and a secondary side lagging bridge arm offset phase angle of the bidirectional DC/DC converter.
The primary side internal phase shift alpha obtained by S1111And the secondary side internally shifts the phase by alpha2And the system phase shift angle β' obtained in S112, are combined to obtain: d1＝0、D2＝α1、D3＝β+D2＝β+α1And D4＝D3+α2＝β+α1+α2＝β+α1+α2All or part of the above-mentioned steps are determined by combining a PWM register and a hardware circuit. D1Representing a reference offset phase angle, D, of the primary side of a dual-active full-bridge bidirectional DC/DC converter2Representing the offset phase angle of the lagging bridge arm at the primary side of the double-active full-bridge bidirectional DC/DC converter, D3Representing the dead-front arm offset phase angle of the secondary side of the double-active full-bridge bidirectional DC/DC converter, D4The secondary side lagging bridge arm offset phase angle of the double-active full-bridge bidirectional DC/DC converter is shown.
D obtained1、D2、D3And D4The method for realizing the phase shift ride-through switching in the double-active full-bridge bidirectional DC/DC converter is realized through the action of a PWM register and a hardware circuit.
The present embodiment further provides a ride-through switching control system of a dual-active full-bridge bidirectional DC/DC converter, including: signal acquisition unit and control unit. The signal acquisition unit is used for acquiring current information of the double-active full-bridge bidirectional DC/DC converter; the control unit is provided with the crossing switching control method.
And the control unit combines loop control according to the collected voltage information and current information of the double-active full-bridge bidirectional DC/DC converter, finally combines an external phase-shifting angle of the system, an internal phase-shifting of a primary side and an internal phase-shifting of a secondary side, combines an internal phase-shifting crossing switching method, and is realized through a hardware circuit, so that the internal phase-shifting crossing switching control result of the double-active full-bridge bidirectional DC/DC converter is realized.
The control unit may adopt a dsp (digital Signal processor) chip. In implementation, the current information of the double-active full-bridge bidirectional DC/DC converter is alternating current and direct current, and the signal acquisition unit detects the current by using the current sensor. Because the control unit uses a DSP chip, and the A/D converter on the control unit is unipolar and can only receive 0-3.0V voltage signals, the control system also comprises a voltage conversion unit which converts the collected voltage so as to be connected with the DSP. The ride-through switching control method of the double-active full-bridge bidirectional DC/DC converter is realized in the DSP to control the output of the double-active full-bridge bidirectional DC/DC converter and realize the internal phase-shift ride-through switching control of the double-active full-bridge bidirectional DC/DC converter.
Referring to fig. 3, the internal phase shift ride-through switching method of the dual-active full-bridge bidirectional DC/DC converter is adopted, so that the stability problems of reduced stability of a system controller, reduced system performance and the like caused by back-and-forth switching of a primary side internal phase shift angle and a secondary side internal phase shift angle in the ride-through process of the system can be well solved on the dual-active full-bridge bidirectional DC/DC converter circuit.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and are preferred embodiments, which are intended to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the scope of the present invention. All equivalent changes or modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (10)
1. A ride-through switching control method of a bidirectional DC/DC converter is characterized by comprising the following steps:
step A, acquiring a modulation transformation ratio coefficient m of the DC/DC converter according to the voltage of the primary side and/or the secondary side of the bidirectional DC/DC converter;
b, judging whether m is larger than 1, and if so, setting a primary side internal phase shift angle and a secondary side internal phase shift angle according to primary side internal phase shift regulation of the bidirectional DC/DC converter; if the result is negative, setting a primary side internal phase shift angle and a secondary side internal phase shift angle according to the secondary side internal phase shift regulation of the bidirectional DC/DC converter;
c, judging whether m belongs to [ 1-delta, 1+ delta ], wherein delta represents the error range of the allowable crossing modulation degree; if yes, executing the following step D; if not, adopting the primary side internal phase shift angle and the secondary side internal phase shift angle of the step B;
step D, calculating the active power P of the bidirectional DC/DC converterdc(ii) a Judgment of | Pdc|≥PoWhether or not it is established, PoRepresenting that the active power is allowed to pass through a set threshold value, and if the active power is allowed to pass through the set threshold value, executing the following step E; if not, executing the following step F;
step E, calculating the active current i, and judging that | i | ≧ ioWhether or not it is established, ioRepresenting a set threshold value allowing the active current to pass through, and if the threshold value is established, adopting the primary side internal phase shift angle and the secondary side internal phase shift angle in the step B; if not, executing the following step F;
step F, updating the internal phase shift angle of the primary side and the internal phase shift angle of the secondary side to set values respectively;
step G, obtaining an outward phase shift angle according to the voltage and current of the primary side and/or the secondary side of the bidirectional DC/DC converter;
and step H, calculating one or more of a primary side reference offset phase angle, a primary side lagging bridge arm offset phase angle, a secondary side lagging leading arm offset phase angle and a secondary side lagging bridge arm offset phase angle of the bidirectional DC/DC converter according to the primary side internal phase shift angle, the secondary side internal phase shift angle and the external phase shift angle.
2. The method according to claim 1, wherein m in step a is represented by the formula m-NpsVdc2/Vdc1Is calculated to obtain wherein Vdc1Is the primary side voltage, V, of a bidirectional DC/DC converterdc2Is the secondary side voltage, N, of a bidirectional DC/DC converterpsThe voltage transformation ratio coefficient of the primary side and the secondary side of the bidirectional DC/DC converter is shown.
3. A ride-through switching control method according to claim 1, wherein in step B, when the result is yes, the primary side internal phase shift is α1Pi (1-m), the secondary side internally shifts the phase by alpha20; when the result is negative, the primary side is internally phase-shifted by alpha10, the secondary side is internally phase-shifted by alpha2＝π(1-1/m)。
4. The ride-through switching control method according to claim 1, wherein δ is 1% in the step C.
5. The ride-through switching control method according to claim 1, wherein in step G, the system out-shift angle is obtained through a control loop according to the voltage information and the current information of the primary side and the secondary side of the bidirectional DC/DC converter.
6. A cross-over handover control method according to claim 1, wherein in step H,
primary side reference offset phase angle D10; and/or
Offset phase angle D of primary side lagging bridge arm2＝α1(ii) a And/or
The secondary side lags the leading arm by a phase angle D3＝β+α1(ii) a And/or
Offset phase angle D of secondary side lagging bridge arm4＝β+α1+α2；
In the above formula, α1、α2And β represents the primary side internal phase shift angle, the secondary side internal phase shift angle and the external phase shift angle, respectively.
7. The ride-through switching control method according to claim 1, wherein the bidirectional DC/DC converter is controlled by a PWM register according to the calculation result of the step H.
8. A ride-through switching control system of a bidirectional DC/DC converter, comprising a control unit carrying the ride-through switching control method according to any one of claims 1 to 7.
9. The ride-through switching control system of claim 8, further comprising a signal acquisition unit for acquiring current information of the bidirectional DC/DC converter.
10. The ride-through switching control system of claim 8, wherein the control unit is a DSP chip, the ride-through switching control system further comprising a voltage conversion unit for converting the collected voltage.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112953236A (en) * | 2021-02-07 | 2021-06-11 | 爱士惟新能源技术(江苏)有限公司 | Phase-shifting control method and system of bidirectional DC/DC converter |
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