Open-Circuit Fault-Tolerant Control for Five-Phase Permanent Magnet Motors with Trapezoidal Back-EMF by Deadbeat Current Tracking
Chen Qian1,2, Xia Yuhang1,2, Zhao Wenxiang1,2, Liu Guohai1,2
1. School of Electrical and Information Engineering Jiangsu University Zhenjiang 212013 China; 2. Jiangsu Key Laboratory of Drive and Intelligent Control for Electric Vehicle Zhenjiang 212013 China
Abstract：When an open-circuit fault occurs, the third harmonic current needs to be injected to utilize the third harmonic back-EMF for the five-phase permanent magnet motor with trapezoidal back EMF. In this case, the fault-tolerant reference current in the static coordinate system is the AC quantity. Due to the bandwidth limitation, the traditional proportional-integral (PI) controller is difficult to track the AC fault-tolerant current accurately, which limits the smooth operation of the system. For this reason, this paper proposes a new fault-tolerant control strategy based on deadbeat current tracking. Firstly, to generate smooth torque under fault condition, the fault-tolerant reference current is obtained according to the principle of zero torque ripple. Secondly, by Euler's discrete method, the discrete models of the motor under single-phase open-circuit and two-phase open-circuit faults are constructed respectively. And then, the deadbeat method is used to track the alternating fault-tolerant reference current, which provides accurate reference voltages for the carrier pulse width modulation (CPWM). Finally, an experimental platform is constructed, and the results verify the effectiveness of the proposed control strategy.
陈前, 夏雨航, 赵文祥, 刘国海. 采用无差拍电流跟踪的五相梯形反电动势永磁电机开路容错控制[J]. 电工技术学报, 2022, 37(2): 368-379.
Chen Qian, Xia Yuhang, Zhao Wenxiang, Liu Guohai. Open-Circuit Fault-Tolerant Control for Five-Phase Permanent Magnet Motors with Trapezoidal Back-EMF by Deadbeat Current Tracking. Transactions of China Electrotechnical Society, 2022, 37(2): 368-379.
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