多相开路故障下的双三相PMSM统一容错控制策略

多相电机在定子开路故障下具有良好的容错性能,与此相关的设备和控制策略改进方面的研究理论也不断被提出。然而,却少有基于统一模型的适用于多相开路故障的容错控制策略。提出了一种应用于双三相永磁同步电机(PMSM)系统三相或三相以下开路故障的容错控制策略,并获得了良好的电机电力和动态性能。针对发生单相到三相开路故障的PMSM提出了统一数学模型,提取出每种故障下对应电机不对称性的矩阵。通过电压方程,推导出每种故障对应的解耦变换矩阵。为了对相电流中的每种谐波进行无差别抑制,建立了谐波子空间。考虑开路故障相数的增加,提出了用于三相开路的有中性点电流的容错控制策略,达到了降低相电流幅值和提升系统冗余度的目的。最后通过试验和仿真结果,验证了理论分析的正确性。

Unified FaultTolerant Control Strategy of Dual ThreePhase PMSM Under MultiPhase OpenCircuit Faults

Multiphase motors had great fault tolerance under stator opencircuit faults. Related facilities, as well as research theories to improve the control strategies, were continuously proposed. However, there were few faulttolerant control strategies based on unified model suitable for multiphase opencircuit faults. A faulttolerant control strategy applying to opencircuit faults in three or fewer phases of the dual threephase permanent magnet synchronous motor (PMSM) system was proposed, which supported better electrical and dynamical performances of the motor. The unified mathematical model for PMSM opencircuit faults in 1~3 phases was presented, and the matrixes representing asymmetry of the motor under faults were extracted. Corresponding decoupling transformation matrixes were derived from voltage equations. Subspaces were also created for harmonics suppression regardless of the harmonic types. With the number of open phases increasing, a faulttolerant control strategy for the neutral point current of threephase open circuit was presented, which aimed at reducing the amplitude of phase currents and increasing the system redundancy. Simulation and experimental results of these faulttolerant control strategies were provided for verification of the theoretical analysis.