改善永磁同步电机容错情况下的低频特性

Improve the Low Speed Performance of PMSM under Fault Tolerant

在四开关三相逆变器矢量控制系统中,为了补偿两个直流母线电容电压的不平衡,提出了一种新的空间脉宽矢量调制(SVM)的方法。详细阐述了理论和设计,提出了一种基于实际空间电压矢量的新的扇区划分方法和零矢量的合成方式。仿真结果证实了所提出方法尤其是在低频特性下的正确性。

To compensate the voltage unbalance of the two split dc-link capacitors in a four-switch three-phase inverter fed field oriented control system,a new space vector modulation（ SVM） approach is proposed in this paper.The theory and design are discussed in detail,a new sector division method based on the real basic voltage is introduced and a virtual zero vector synthesizing method is proposed. Simulation results verified the effectiveness,especially in low speed situation.