基于非对称SVPWM的电动汽车五相永磁无刷电机容错控制

针对电动汽车用五相永磁无刷电机单相开路故障,提出了一种基于非对称空间矢量脉宽调制策略的故障容错控制方案。新型故障容错控制的设计分为两个部分,对五相永磁无刷电机驱动系统开路故障下的电压矢量关系进行了分析,然后对空间矢量调制算法进行改进,即在一个扇区中选择构成不对称波形的开关状态作为输出。该非对称空间矢量调制可以降低非故障相的电流谐波和降低转矩脉动。基于试验平台开展了试验研究,试验结果验证了新型容错控制可实现系统故障期间的低转矩脉动,且保持较好的动态性能。

FaultTolerant Control of FivePhase Permanent Magnet Brushless MotorBased on Asymmetric SVPWM for Electric Vehicle

Aiming at the singlephase open circuit fault of fivephase permanent magnet brushless motor for electric vehicle, a faulttolerant control strategy based on asymmetric space vector pulse width modulation control strategy was proposed. The design of a new type of fault tolerant control was divided into two parts, the five phase permanent magnet brushless motor drive system for open circuit voltage vector relationship under fault was analyzed, and then the space vector modulation algorithm was improved, which in a sector switch state of asymmetric waveform as output. The asymmetric space pulse width vector modulation could reduce the current total harmonic distribution and torque ripple of normal phases. Based on the experimental platform, the experimental results showed that the new faulttolerant adjustable achieved low torque ripple during system failure and kept good dynamic performance.