By analyzing the basic principle of voltage space vector pwm , a method is proposed to choose the zero vectors dynamically according to the power factor angle of the load and the concept of the lag angle of non - switching sectors 在分析了空间矢量pwm基本原理的基础上,提出了一种根据负荷功率因数角动态分配零矢量的方法,并引入了不开关扇区滞后角的概念。