中文摘要：

四桥臂有源电力滤波器（APF）电压矢量轨迹位于三维空间内,调制策略实现困难。为简化调制过程,研究三维空间矢量脉宽调制（3D-SVPWM）与载波脉宽调制（CBPWM）两种算法的本质联系,在两者归一化特性的基础上,建立3D-SVPWM中基矢量作用时间与三相参考电压的数学关系,获得四桥臂变流器简化空间矢量调制策略。仿真及实验验证结果均证实了简化算法的正确性和有效性。该简化算法计算量小,易于实现。

英文摘要：

The track of voltage vectors in four-leg active power filter（APF） are located in the throe-dimensional space, it is difficult to modulate.To simplify the modulation process ,the essentiality contact of three-dimensional space vector pulse width modulation （3D-SVPWM） and carrier-based PWM （CBPWM） algorithm have been researched,based on the normalization of them, the relationship between the duration time of basic vectors and the three-phase refer- ence voltage is established,and the simplified 3D-SVPWM strategy for four-leg converter is obtained.Simulation and experiment are carried out,and the results verify the correctness and validity of the proposed simplified algorithm.As the proposed algorithra with less calculation, it＇s easier to realize.