提出了一种容错并联型有源电力滤波器(APF),给出其结构和运行模式.分析了逆变器某相故障时,逆变器的容错结构即三相四开关型逆变器及其工作原理.提出了稳定直流侧电压的方法,并且提出了有源电力滤波器由正常工作状态转到故障状态的控制策略.仿真结果表明容错并联型有源电力滤波器在正常工作状态和故障状态都能较好的抑制谐波,直流侧电压保持稳定,系统可靠性高. A fault-tolerant shunt active power filter (APF) is proposed and its structure and operation mode are given.Analyzing fault-tolerant structure of inverter, ie, three-phase four-switch inverter Its working principle is put forward.The method of stabilizing DC voltage is proposed and the control strategy of active power filter from normal working condition to fault condition is put forward.The simulation results show that the fault tolerant shunt active power filter can work in normal working condition and fault condition The state can better suppress the harmonics, the DC voltage remains stable and the system has high reliability.