Aiming at improving the fault-tolerant performance of switched reluctance generators, a new power converter with fault-tolerance capability is proposed in this paper. The structure of the converter is simple and there is only one transistor in each of the working modes, which makes fault diagnosis easier. To obtain more fault information, an improved current measurement method is proposed. The phase current is obtained by solving current equations obtained by current sensors and rotor positions. Open-circuit and short-circuit faults can be determined by comparing the consistency of the current slope and gate signal. Fault locations can be determined by comparing the relationships among the magnitude of the bus current, the phase current, and the corresponding thresholds. Open-circuit transistors can be replaced by fault-tolerant strategy, which returns the power converter to normal and maintains the stable operation of the system. Simulations and experiments show that the open-circuit and short-circuit faults of transistors can be diagnosed by the proposed strategy.

为了提高开关磁阻发电机的容错性能，本文提出了一种具有容错能力的新型功率变换器。变换器结构简单，每种工作模式只有一个晶体管，便于故障诊断。为了获得更多的故障信息，提出了一种改进的电流测量方法。相电流是通过求解电流传感器和转子位置得到的电流方程得到的。开路和短路故障可以通过比较电流斜率和栅极信号的一致性来确定。故障位置可以通过比较母线电流大小、相电流和相应阈值之间的关系来确定。开路晶体管可以用容错策略代替，使电源转换器恢复正常并保持系统稳定运行。仿真和实验表明，该策略可以诊断晶体管的开路和短路故障。