Integrated Control Strategy for Distortion Current Elimination of Fault-Tolerant Open-End Winding Permanent Magnet Synchronous Machine With Topology Reconfiguration

Abstract

This article proposes a reconfigured topology of a five-leg inverter for the open-end winding permanent magnet synchronous machine (OW-PMSM) driving system after the device fault condition. Due to the asymmetric structure and common dc bus of the reconfigured fault-tolerant five-leg inverter, the zero-sequence current generated by the dead-time effect and inherent third harmonic voltage of the open-end winding will deteriorate the output torque and the efficiency of the driving system. Thus, the asymmetric property and dead-time effect of the five-leg inverter on the distortion currents of OW-PMSM are analyzed, and an integrated control method with the closed-loop of zero-sequence current and the compensation of dead-time effect and third harmonic voltage are employed to suppress the distortion current for the low-current total harmonic distortion (THD) of the OW-PMSM. The effectiveness and validity of the high-performance OW-PMSM driving system based on the five-leg inverter were verified by the simulation and experimental results.