An open-end winding PMSM drive system with a common DC bus can produce zero-sequence current and high switching loss, which reduce the performance and efficiency of the system. Aiming at this problem, this paper proposes a fast modulation strategy that can effectively suppress the zero-sequence current, reduce the number of switching times in a sampling period to 6, and reduce the average switching loss by 50%. In addition, when compared with the conventional CBPWM and SVPWM algorithms, this strategy does not need to decompose the modulation wave, or synthesize the voltage vector. Furthermore, the calculation burden is small, which makes it very easy to implement. Experimental results verify the effectiveness and feasibility of this strategy.

具有公共直流母线的开放式绕组PMSM驱动系统会产生零序电流和高开关损耗，从而降低系统的性能和效率。针对这一问题，本文提出了一种快速调制策略，可以有效抑制零序电流，将采样周期的开关次数减少到6次，平均开关损耗降低50％。此外，与传统的CBPWM和SVPWM算法相比，该策略无需分解调制波或合成电压矢量。此外，计算负担小，这使得它很容易实现。实验结果证明了该策略的有效性和可行性。