CN-122026703-A - Current distortion compensation circuit of three-phase Vienna rectifier

CN122026703ACN 122026703 ACN122026703 ACN 122026703ACN-122026703-A

Abstract

The application provides a current distortion compensation circuit of a three-phase Vienna rectifier, which comprises a power supply, a three-phase Vienna rectifier circuit, a current distortion compensation circuit and a load, wherein the power supply is used for providing three-phase alternating current sinusoidal voltage, the three-phase Vienna rectifier circuit is connected with the power supply and is used for receiving the three-phase alternating current sinusoidal voltage provided by the power supply and outputting direct current voltage, the current distortion compensation circuit is connected with the three-phase Vienna rectifier circuit and comprises a first current distortion compensation module, a second current distortion compensation module and a third current distortion compensation module, the first current distortion compensation module, the second current distortion compensation module and the third current distortion compensation module are used for inputting the direct current voltage and generating compensation voltage of the three-phase Vienna rectifier circuit, and the load is connected with the current distortion compensation circuit. According to the application, three current distortion compensation modules are adopted to generate the compensation voltage of the three-phase Vienna rectifier circuit, so that the voltage at two ends of the inductor during interval switching is improved, the rising slope of the input current is improved, the distortion of the input current at the interval switching position is improved, and the input factor is higher.

Inventors

YE SIWEN
ZHU JIAWEI
Wei Mingou
ZHU YUJING
ZHANG CHUHAN
GAO FEI
YANG XIJUN

Assignees

上海交通大学

Dates

Publication Date: 20260512
Application Date: 20260107

Claims (10)

1. A current distortion compensation circuit for a three-phase vienna rectifier, comprising: a power supply for providing a three-phase alternating current sinusoidal voltage; the three-phase Vienna rectifier circuit is connected with the power supply and is used for receiving three-phase alternating current sinusoidal voltage provided by the power supply and outputting direct current voltage; the current distortion compensation circuit is connected with the three-phase Vienna rectifier circuit and comprises a first current distortion compensation module, a second current distortion compensation module and a third current distortion compensation module, wherein the first current distortion compensation module, the second current distortion compensation module and the third current distortion compensation module are used for inputting the direct-current voltage to generate compensation voltage of the three-phase Vienna rectifier circuit; and the load is connected with the current distortion compensation circuit and is used for receiving the direct-current voltage to supply power for a product.
2. The current distortion compensation circuit of a three-phase vienna rectifier of claim 1, wherein the power source comprises a three-phase sinusoidal voltage source comprising a sinusoidal ac voltage source and a plurality of filter inductors Sinusoidal ac voltage source Sinusoidal alternating current voltage source The sinusoidal alternating voltage source The sinusoidal alternating voltage source The sinusoidal alternating voltage source The voltage amplitude is the same, the phase is lagged behind the preset angle in sequence, and the plurality of filter inductors comprise a filter inductor L1, a filter inductor L2 and a filter inductor L3.
3. The current distortion compensation circuit of a three-phase vienna rectifier of claim 2, wherein the sinusoidal ac voltage source Is connected with the sinusoidal alternating voltage source Is connected to one end of the sinusoidal alternating voltage source Is connected at one end to form a midpoint N, the sinusoidal alternating voltage source Is connected to one end of the filter inductor L1, the sine alternating voltage source Is connected to one end of the filter inductor L2, the sine alternating voltage source And the other end of the filter inductance L3 is connected with one end of the filter inductance.
4. The current distortion compensation circuit of the three-phase vienna rectifier according to claim 3, wherein the three-phase vienna rectifier circuit comprises a power diode D1, a power diode D2, a power diode D3, a power diode D4, a power diode D5, a power diode D6, and power switches Sa1, sa2, sb1, sb2, sc1, sc2.
5. The current distortion compensation circuit of the three-phase vienna rectifier according to claim 4, wherein an anode of the power diode D1 is connected to a cathode of the power diode D4 after being connected to the other end of the filter inductor L1, a cathode of the power diode D1 is connected to a cathode of the power diode D3 and a cathode of the power diode D5, respectively, an anode of the power diode D3 is connected to a cathode of the power diode D6 after being connected to the other end of the filter inductor L2, and an anode of the power diode D5 is connected to a cathode of the power diode D2 after being connected to the other end of the filter inductor L3; The collector of the power switch Sa1 is connected with the other end of the filter inductor L1, the emitter of the power switch Sa1 is connected with the emitter of the power switch Sa2 to form a bidirectional switch Sa, the collector of the power switch Sb1 is connected with the other end of the filter inductor L2, the emitter of the power switch Sb1 is connected with the emitter of the power switch Sb2 to form a bidirectional switch Sb, the collector of the power switch Sc1 is connected with the other end of the filter inductor L3, and the emitter of the power switch Sc1 is connected with the emitter of the power switch Sc2 to form a bidirectional switch Sc.
6. The current distortion compensation circuit of the three-phase vienna rectifier according to claim 5, wherein the first current distortion compensation module comprises a first power switch sub-module, a second power switch sub-module, and a third power switch sub-module, the output negative terminal of the first power switch sub-module, the output negative terminal of the second power switch sub-module, and the output negative terminal of the third power switch sub-module are mutually connected to form a midpoint O, the collector of the power switch Sa2 is connected to the first output PA of the first current distortion compensation module, the collector of the power switch Sb2 is connected to the second output PB of the first current distortion compensation module, and the collector of the power switch Sb3 is connected to the third output PC of the first current distortion compensation module.
7. The current distortion compensation circuit of the three-phase vienna rectifier of claim 6, wherein the second current distortion compensation module comprises a filter capacitor C3, a filter capacitor C4, a filter capacitor C5, and a first rectifying circuit, a second rectifying circuit, and a third rectifying circuit; The output anode of the first rectifying circuit is connected with the anode of the filter capacitor C3 and forms a first output anode of the second current distortion compensation module, and the output cathode of the first rectifying circuit is connected with the cathode of the filter capacitor C3 and forms a first output cathode of the second current distortion compensation module; the output anode of the second rectifying circuit is connected with the anode of the filter capacitor C4 and forms a second output anode of the second current distortion compensation module, and the output cathode of the second rectifying circuit is connected with the cathode of the filter capacitor C4 and forms a second output cathode of the second current distortion compensation module; The output positive electrode of the third rectifying circuit is connected with the positive electrode of the filter capacitor C5 and forms a third output positive electrode of the second current distortion compensation module, and the output negative electrode of the third rectifying circuit is connected with the negative electrode of the filter capacitor C5 and forms a third output negative electrode of the second current distortion compensation module.
8. The current distortion compensation circuit of the three-phase vienna rectifier of claim 7, wherein an input positive electrode of a first power switch sub-module of the first current distortion compensation module is connected to a first output positive electrode of the second current distortion compensation module, an input negative electrode of the first power switch sub-module of the first current distortion compensation module is connected to a first output negative electrode of the second current distortion compensation module, an input positive electrode of the second power switch sub-module of the first current distortion compensation module is connected to a second output positive electrode of the second current distortion compensation module, an input negative electrode of the second power switch sub-module of the first current distortion compensation module is connected to a second output negative electrode of the second current distortion compensation module, an input positive electrode of a third power switch sub-module of the first current distortion compensation module is connected to a third output positive electrode of the second current distortion compensation module, and an input negative electrode of the third power switch sub-module of the first current distortion compensation module is connected to a third output negative electrode of the second current distortion compensation module.
9. The current distortion compensation circuit of the three-phase vienna rectifier of claim 8, wherein the third current distortion compensation module comprises a transformer T1, a transformer T2, a transformer T3, a blocking capacitor A power switch Q1, a power switch Q2, a power switch Q3 and a power switch Q4, wherein the input positive electrode of the transformer T1 and the blocking capacitor The input cathode of the transformer T1 is connected with the input cathode of the transformer T2, the output cathode of the transformer T1 is connected with the input cathode of the first rectifying circuit, and the output cathode of the transformer T1 is connected with the input cathode of the first rectifying circuit; The input cathode of the transformer T2 is connected with the input anode of the transformer T3, the output anode of the transformer T2 is connected with the input anode of the second rectifying circuit, and the output cathode of the transformer T2 is connected with the input cathode of the second rectifying circuit; The input cathode of the transformer T3 is respectively connected with the emitter of the power switch Q3 and the collector of the power switch Q4, the output anode of the transformer T3 is connected with the input anode of the third rectifying circuit, and the output cathode of the transformer T3 is connected with the input cathode of the third rectifying circuit; The blocking capacitor The negative electrode of the power switch Q1 is connected with the emitter of the power switch Q1 and the collector of the power switch Q2 respectively, the collector of the power switch Q1 is connected with the cathode of the power diode D5, the emitter of the power switch Q2 is connected with the midpoint O after being connected with the collector of the power switch Q3, the emitter of the power switch Q3 is connected with the collector of the power switch Q4, and the emitter of the power switch Q4 is connected with the anode of the power diode D2.
10. The current distortion compensation circuit of the three-phase vienna rectifier according to claim 9, further comprising an electrolytic capacitor C1 and an electrolytic capacitor C2, wherein the positive electrode of the electrolytic capacitor C1 is connected to the collector of the power switch Q1, and the negative electrode of the electrolytic capacitor C1 is connected to the positive electrode of the electrolytic capacitor C2 and then to the midpoint O; The cathode of the electrolytic capacitor C2 is connected with the emitter of the power switch Q4; The positive electrode p of the load is connected with the positive electrode of the electrolytic capacitor C1, and the negative electrode n of the load is connected with the negative electrode of the electrolytic capacitor C2.

Description

Current distortion compensation circuit of three-phase Vienna rectifier Technical Field The application relates to the technical field of power electronic converters, in particular to a current distortion compensation circuit of a three-phase Vienna rectifier. Background In order to improve the power density and the working efficiency of the three-level rectifier and reduce the number of power switching devices, a brand new three-phase three-level power factor correction (Power Factor Correction, PFC) circuit is provided, named as a Vienna rectifier (VIENNA RECTIFIER, VR for short), the topology filter circuit is simple, each power switch only bears half of the direct-current output voltage, and therefore, the three-level rectifier is suitable for being applied to occasions with high voltage and high power. The equivalent circuit of the Vienna rectifier can simplify the control and modulation problems of the three-phase three-level converter into the control and modulation of two completely decoupled Boost converters, thereby remarkably reducing the complexity of the design of the controller. However, in practice, at the section boundaries, crossover distortion phenomenon occurs in the input current. With the increase of output power and the increase of power supply frequency, the current distortion phenomenon is more obvious, and almost all current control methods and modulation strategies can not effectively eliminate the current distortion phenomenon at present, so that the current distortion phenomenon has great influence in application scenes with high requirements on electric energy quality. The prior Watkins-Johnson converter, namely a step-down type Buck DC-DC converter, has the voltage transformation ratio ofThe transformation range isThe disadvantage is that the output voltage has larger ripple, no isolation capability, and the duty ratioThe method cannot be suitable for high-pressure difference application scenes, including subway power supplies, civil aviation power supplies and the like. In the patent CN201010283445.7, a high-voltage to low-voltage dc converter includes an ac chopper circuit, a high-frequency transformer circuit, a rectifying filter circuit, a waveform conversion circuit and a power frequency inverter circuit which are sequentially connected in series, and the converter has the disadvantages of complex structure and higher withstand voltage of a power switch. The improved modulation algorithm of zero-crossing distortion and interval crossing distortion of input current also exists in the Vienna rectifier (1) a zero-sequence component injection method, based on SVPWM algorithm, a specific small vector combination is adopted in each sector, the calculation of duty ratio is not influenced by the direction of phase current near zero-crossing points, three-phase current distortion can be improved to a certain extent, the defect is that the suppression effect on zero-crossing distortion of input current is poor, the efficiency is reduced and the power factor is reduced under the condition that the modulation degree exceeds a certain value, and (2) an adaptive SVPWM algorithm supplements the correction measure of zero-crossing distortion of input current when the reference voltage vector is outside the constraint interval of the modulation degree, the harmonic compensation capability of the Vienna rectifier is improved, the sector judgment algorithm of the algorithm is more complex, and the output effect is poor when the modulation degree fluctuates. The current distortion caused by time zone replacement of the prior improved modulation algorithm of zero crossing distortion and interval crossing distortion of input current and the Vienna rectifier simplified into two completely decoupled Boost converters is different in principle and suppression method, and an answer is required to be found according to the working mechanism of the two completely decoupled Boost converters. In view of this, in order to solve the serious distortion phenomenon of the input current of the three-phase vienna rectifier at the interval boundary, a new circuit and a corresponding modulation algorithm need to be designed. Disclosure of Invention In view of the foregoing, it is an object of the present application to provide a current distortion compensation circuit for a three-phase vienna rectifier. In a first aspect of the present application, there is provided a current distortion compensation circuit of a three-phase vienna rectifier, comprising: a power supply for providing a three-phase alternating current sinusoidal voltage; the three-phase Vienna rectifier circuit is connected with the power supply and is used for receiving three-phase alternating current sinusoidal voltage provided by the power supply and outputting direct current voltage; the current distortion compensation circuit is connected with the three-phase Vienna rectifier circuit and comprises a first current distortion compensation module