A Novel Current Control Method Based on Dual-Mode Structure Repetitive Control for Three-Phase Power Electronic Load

Zheng Zhang,Chongbing Zhang,Yue Zhang,Wangmin Deng,Xinghua Liu

doi:10.1109/access.2021.3122123

Abstract

The test platforms of motor driver are relatively expensive, high energy consumption, complex mechanical structure, and not readily available. A three-phase power electronic load of simulated permanent magnet synchronous motor is used to eliminate the risk associated with the performance testing of motor driver, without complex mechanical system. This equipment not only can simulate a variety of load characteristics, but also has the ability to recover energy with little loss and high power factor. In this work, a novel current tracking control strategy based on dual-mode structure repetitive control (DMRC) is proposed to improve the tracking accuracy of alternating current. Compare to control strategy operated in the d-q coordinate system, the proposed control strategy can direct track sine wave commands on the stationary α-β coordinate system, which is easier to implement with fewer intermediate coordinate transformation in practice. An inductor-capacitor-inductor (LCL) filter is used to interface the voltage source converter (VSC) and the tested inverter in the three-phase electronic load system. Adjusting the odd-harmonic gain and even-harmonic gain of DMRC controller can effectively suppress the current harmonics. Furthermore, the comparative evaluation of DMRC, repetitive control and PI control is conducted to verify the superiority of DMRC. The simulation and experiment have been carried out on three-phase power electronic load. As a result, the proposed method achieve low total harmonic distortion (THD) (<3.8%) of AC current, It can provides nearly 20% reduction of THD in phase current when compared with PI controller.

Highlights

Experimental validation and test of driving inverters should be carried out to ensure appropriate efficiency and performance in the final stage of development of threephase tested power supply equipment [1]
Three-phase power electronic load has been proposed by academic research to simulate the behavior of the actual machine when connected to grid or a voltage source inverter (VSI)
High-power amplifiers based on a voltage source inverter could result in significant precision errors and even instabilities, due to the discrete voltage levels producing by the power electronics switches [14]

Summary

Introduction

Experimental validation and test of driving inverters should be carried out to ensure appropriate efficiency and performance in the final stage of development of threephase tested power supply equipment [1]. Three-phase power electronic load has been proposed by academic research to simulate the behavior of the actual machine when connected to grid or a voltage source inverter (VSI). A digital dual-mode-structure repetitive control approach is proposed in [40] for the single-phase shunt active power filter (APF) It can improve the tracking ability of current and eliminate high order harmonic. A plug-in DMRC scheme is presented for the three-phase power electronic load system to suppress the tracking error and current harmonic on the αβ stationary reference frame. Simulation verification of the proposed plug-in DMRC method on the three-phase power electronic load system is carried out to demonstrate the effectiveness of the proposed current control method under various reference current frequencies.

Methods

Results

Conclusion