Research of Fault-Tolerant Control Strategy for Open-End Winding PMSM Under Open-Phase Fault

With its unique winding configuration, the open-end winding permanent magnet synchronous motor (OW-PMSM) inherits a series of advantages of the permanent magnet synchronous motor (PMSM) and has good fault tolerance with dual inverter drive. This paper proposes a fault-tolerant control strategy for open-phase faults in three-phase PMSM powered by a common DC bus. This paper studies the fault-tolerant operation of OW-PMSM under open-phase faults, addressing the most common failure of power devices in electric drive systems. This paper presents a simulation based on dual-inverter Sinusoidal Pulse Width Modulation (SPWM) under open-phase fault. A proportional resonance controller is employed to suppress the zero-sequence current in the system after the fault, weaken the harmonics produced by the third-order zero-sequence current in the PMSM system, thereby reducing electromagnetic torque ripple and improving the control performance of the system. The simulation results demonstrate the effectiveness of the proposed approach.

I. Introduction

The safety performance of electric vehicles has always been a major concern, and issues such as battery self-ignition and explosion have been effectively controlled. However, in recent years, frequent failures of the electric drive system in electric vehicles have reduced consumer's willingness to purchase them. Electric drive system faults can be classified into two categories: inverter faults [1] and winding faults [2], where inverter faults account for a larger proportion [3], [4]. PMSM do not have inherent fault-tolerant capabilities. For the common open-phase fault of PMSM, the traditional approach is to increase redundant phases or more hardware [5], [6], but fault-tolerant control has higher complexity and adds additional costs. OW-PMSM has the advantages of high efficiency and high power density of PMSM [7], [8], and open-winding motors based on dual inverter drives have good fault tolerance performance, which can achieve fault-tolerant operation under different faults. This makes the motor more suitable for the current development direction of electric vehicles.