A Double-phase Open-circuit Fault Tolerant Control Method for Five-phase PMSM with Zero Sequence Voltage Compensation

Five-phase machines have gained increasing attention due to their fault-tolerant characteristics. This paper proposes a fault-tolerant control method in a five-phase surface-mounted permanent magnet synchronous machine (PMSM) for an adjacent and non-adjacent double-phase open-circuit fault. The proposed method not only considers the current reconfiguration for double-phase open-circuit fault, but also thoroughly analyzes the variation of neutral point voltage and proposes voltage reconfiguration method. Based on the derived remaining phase currents, the derating factors under double-phase open-circuit faults are calculated. The torque fluctuation in the proposed fault tolerant method is nearly identical to that observed during the healthy stage. Additionally, after using the voltage reconfiguration and optimal PR controller configuration, the phase current distortion and computational time are reduced.