一种基于电路等效替换的整流器容错控制方法

A FAULT-TOLERANT CONTROL METHOD OF RECTIFIER BASED ON CIRCUIT EQUIVALENT REPLACEMENT

对三相桥式PWM整流器中单个功率开关管开路时的电路模型进行化简,并对其分析和讨论,提出一种基于电路等效替换的容错控制算法。当开路故障发生时,在不改变整流器拓扑结构的前提下,该方法能有效减少交流侧电流畸变,维持直流母线电压稳定。通过仿真和实验验证所提出的容错控制方法的正确性和有效性。

The circuit model of single open-circuit fault in three-phase bridge PWM converter is simplified. A faulttolerant control method based on equivalent circuit substitution is proposed. When open-circuit fault occurs,the method allows to effectively reduce the current distortions of AC side and maintain DC voltage stability while the topology of PWM converter remains unchanged. The correctness and validity of the proposed method are verified by simulation and experiments.