关键词: 开关磁阻电机, 开路故障, 短路故障, 参考转矩补偿, 直接瞬时转矩控制

Abstract: In order to solve the problem of abnormal current and rotation moment due to open and short circuit faults in switched reluctance motor ( SRM ) power converters, fault-tolerant control scheme was proposed. By analyzing the mechanical motion equation of speed fluctuation, an open-circuit fault-tolerant control algorithm based on reference torque compensation was designed to deal with the problem of excessive phase current. Aiming at the short circuit faults, by analyzing the characteristics of current peak and slope change in the fault-related fault interval, the timely diagnosis of short-circuit faults was realized. Once the short-circuit fault was found, the excitation of the fault phase was interrupted immediately and the switch was switched to the open-circuit fault mode, so as to realize the short-circuit fault-tolerant control. Both fault-tolerant methods were based on direct instantaneous torque control ( DITC) . Experiments of open-circuit and short-circuit faults were designed at the speed of 500 r / min and 1 000 r / min, simulation results verified the correctness and effectiveness of the fault tolerant method.

Key words: switched reluctance motor( SRM), open circuit fault, short-circuit fault, reference torque compensation, direct instantaneous torque control ( DITC)