Abstract
The multi-phase motor drive system with multiple H-bridge power supply has high fault tolerance, which is widely used in aerospace, electric vehicle, ship integrated power system and other fields. In this paper, a fault-tolerant control strategy based on decoupling control and stator current compensation is proposed for the propulsion system of five-phase PMSM with independent neutrals. Firstly, the mathematical model of PMSM is established by using vector space decoupling method; Secondly, a stator current compensation method is adopted to carry out fault-tolerant control after the motor has single-phase and two-phase open-circuit faults and the fault-tolerant control system based on decoupling control is established; Finally, the decoupling control model and the fault-tolerant control of stator current compensation are verified by the simulation and experiment. The simulation and experiment results show that the method can reduce the torque ripple caused by the stator winding open-circuit fault, and the operation performance of the motor under fault condition is significantly improved.
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