三相四开关有源电力滤波器新型控制策略研究

A New Controlled Strategy for Four-switch and Three-phase Active Filter

基于无差拍控制,提出了一种适用于三相四开关有源电力滤波器的新型控制策略:以构建价值函数为寻优目标,在一个开关周期内直接选取最优电压矢量替代传统SVPWM调制,无需复杂的时间计算。分析了三相四开关逆变器电压空间矢量特点,并构建了合成矢量,优化空间电压矢量作用顺序和增设寻优条件,减少开关频率,以提高系统的补偿性能。该方法控制简单,易实现,仿真结果验证了所提方法的有效性和实用性。

Based on no deadbeat control,a new controlled strategy is proposed for a four switch and threephase active filter. To build value function as the optimized goal,an optimal voltage vector is directly selected to replace traditional SVPWM modulation in a switching cycle without complex calculation of time. the characteristics of voltage and space about the four switch and three-phase inverter are analyzed,then the synthetic vector is built for optimizing the space voltage vector sequence and adding the optimal conditions,reducing the switching frequency and improving the compensatory property of the system. The emulation result shows that the method is easy for control and the validity and practicability are demonstrated.