对称六相和三相PMSM串联系统反电动势谐波效应补偿控制

提出了单逆变器驱动对称六相和三相PMSM串联系统的谐波效应补偿控制策略.针对实际对称六相PMSM非正弦反电动势中高次谐波将会对该串联系统的运行产生耦合的问题,建立了对称六相PMSM和三相PMSM串联系统的虚拟多电机耦合模型,揭示了对称六相PMSM中主要的二次谐波对串联系统解耦控制的影响机理,提出了消除六相PMSM中等效辅电机产生的转矩脉动耦合的控制方法,分别进行了变速变载对比仿真.结果表明:所提补偿控制策略能够改善反电动势中含有最主要二次谐波产生的转矩脉动对串联系统运行的耦合问题,实现了两台串联电机的独立控制.

Control for symmetrical six-phase and three-phase PMSM series-connected system based on back-EMF harmonic effects compensating

The harmonic effects compensating control strategy for symmetrical six-phase and three-phase PMSM series-connected system driven by single inverter is presented. High-order harmonics inevitably exist in non-sinusoidal back EMF (electromotive force) of actual symmetrical six-phase PMSM, which influence the decouple control of the series-connected system, so the fictitious multi-machine coupling models of symmetrical six-phase PMSM and three-phase PMSM series-connected system are set up. The influence mechanism on the decouple control by the second-harmonics of symmetrical six-phase PMSM is analyzed. The improved control method of eliminating torque pulse couple produced by fictitious second-motor of symmetrical six-phase PMSM is presented. Variable speed and variable load simulation results validate that the proposed compensating control strategy can improve the torque pulse and couple performances of series-connected system by the second back EMF harmonics, which can realize the independent operation of the two series-connected motors.