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Control method of Vienna rectifier under power grid imbalance

A technology of power grid imbalance and control method, which is applied in the direction of electrical components, high-efficiency power electronic conversion, output power conversion device, etc., can solve the problems of output voltage secondary ripple, rectifier input current distortion, etc., and achieve simple control method, beneficial effect

Active Publication Date: 2021-10-01
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to realize the operation control of the Vienna rectifier under the unbalanced power grid, solve the problem of rectifier input current distortion and output voltage secondary ripple, and can maintain the stability of rectifier unit power factor and DC voltage

Method used

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  • Control method of Vienna rectifier under power grid imbalance
  • Control method of Vienna rectifier under power grid imbalance
  • Control method of Vienna rectifier under power grid imbalance

Examples

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Embodiment 1

[0047] figure 1 Shown is the applied Vienna rectifier topology of the present invention, among the figure v a , v b , v c is the three-phase input voltage, L a , L b , L c is the input inductance, D 1 ~D 6 is the diode, S 1 ~S 6 is the switching tube, C 1 、C 2 is the output capacitance, R 0 for the load.

[0048] figure 2 Shown is the principle diagram of the Vienna rectifier control method under the unbalanced power grid of the present invention. In the present embodiment, the switching frequency of the Vienna rectifier is 200kHz, and the sampling frequency of the DSP digital controller is 100kHz. The control steps during operation include the following parts:

[0049] 1) The DSP digital controller samples the three-phase input voltage signal v of the Vienna rectifier in the grid a , v b , v c , three-phase input current signal i a i b i c and the output voltage signal V dc .

[0050] 2) The three-phase input voltage signal v a , v b , v c pass imag...

example 1

[0068] Utilize the Vienna rectifier control method under unbalanced power grid in this embodiment, build a simulation model on the PLECS simulation software, and simulate the Vienna rectifier in aviation applications, the steps are as follows:

[0069] 1) Set the effective value of input voltage A-phase 103V, B-phase 115V, C-phase 126V, there is 10% unbalance in three-phase voltage, input voltage frequency is 400Hz, output voltage is 360V, output power is 4.5kW, switching frequency is 200kHz, sampling frequency 100kHz, input inductance 150μH, output capacitance 440μF.

[0070] 2) Adopt conventional voltage and current double-loop PI control, by Figure 7 It can be seen that the input current of the rectifier is distorted, the total harmonic distortion (THD) of the input current reaches 4.89%, and the output voltage has a secondary ripple of about 6V.

[0071] 3) Using the proposed control method under unbalanced power grid, the Figure 8 It can be seen that the harmonic cont...

experiment example 1

[0076] Using the Vienna rectifier control method under unbalanced power grid in this embodiment, the experimental verification is carried out through the 4.5kW aviation Vienna rectifier prototype platform, and the steps are as follows:

[0077] 1) Set the effective value of the input voltage of the three-phase input source: A-phase 103V, B-phase 115V, C-phase 126V, there is a 10% unbalance in the three-phase voltage, the input voltage frequency is 400Hz, the output voltage is 360V, the output power is 4.5kW, and the switching frequency is 200kHz , the sampling frequency is 100kHz, the input inductance is 150μH, and the output capacitance is 440μF.

[0078] 2) Adopt conventional voltage and current double-loop PI control, by Figure 11 It can be seen that the input current of the rectifier is distorted, the total harmonic distortion (THD) of the input current reaches 8.54%, and the output voltage has a secondary ripple of about 3.5V.

[0079] 3) Using the proposed control meth...

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Abstract

The invention relates to a control method of a Vienna rectifier under power grid imbalance, and belongs to the field of electric energy conversion. The method mainly comprises the steps of calculation of a power grid orthogonal signal and a power grid frequency, calculation of a current reference value under an unbalanced power grid, control over a Vienna rectifier under an unbalanced aviation wide frequency conversion power grid, and suppression of input current harmonic waves and output voltage fluctuation of the Vienna rectifier. Aiming at the rectifier, the method provided by the invention provides a new control strategy for the three-phase rectifier due to the fact that the current methods applied to the aviation wide frequency conversion power grid for controlling the rectifier under the three-phase imbalance are few. According to the invention, a three-phase phase-locked loop and power grid positive and negative sequence component calculation are not needed, the control algorithm is simple, the method is suitable for an aviation wide frequency conversion power grid with the frequency changing in the range of 360-800 Hz, and it can be guaranteed that the Vienna rectifier maintains high-power-factor operation and stable direct current output voltage under the working condition that the power grid is unbalanced.

Description

technical field [0001] The invention relates to a control method suitable for a three-phase three-level three-switch (Vienna) rectifier under unbalanced power grid, belonging to the field of electric energy conversion. Background technique [0002] With the development of more electric aircraft and all-electric aircraft technology, the demand for power capacity of airborne equipment is increasing, and more and more AC variable frequency power supply systems are used in aircraft power systems, that is, the aeroengine directly drives the generator to generate electricity. Three-phase frequency conversion AC input, the effective value of the voltage is 115V, and the frequency is 360-800Hz. In the aviation power supply system, due to its relatively independent system and large internal resistance, there is a high requirement for the current harmonic content of the power grid. The three-phase rectifier with power factor correction (PFC) function is particularly important in the p...

Claims

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Application Information

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IPC IPC(8): H02M7/217H02M1/42H02M1/14H02M1/12
CPCH02M7/2173H02M7/2176H02M1/4216H02M1/14H02M1/12Y02B70/10
Inventor 任小永徐子梁陈乾宏张之梁郑志豪樊靖轩吴玲燕周治成
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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