有源电力滤波器滞环电流的模糊控制策略

针对有源电力滤波器(APF)固定环宽滞环电流控制补偿范围有限的问题,提出一种基于模糊控制的可变环宽滞环电流控制策略.通过对APF的建模和对滞环电流控制原理的分析可知谐波电流补偿能力与滞环环宽密切相关.以指令电流与实际电流的偏差及其变化率为输入变量建立模糊控制规则,实现滞环环宽随补偿要求进行调节.PSIM仿真结果表明:所提方法可以改善APF对谐波电流的跟踪性能,尤其是在过零点和顶点时性能改善较为明显.实验样机的实验数据证明,该方法可以加强APF谐波治理效果,有较好的实用性.

Hysteresis Current Fuzzy Control Strategy for APF

Hysteresis current controllers with fixed band for active power filters (APFs) have limited compensation ability, so a new one with variable band based on fuzzy rules was proposed. Modeling the APF and analyzing the principle of hysteresis current control revealed that the compensation ability to harmonic current is closely related to the width of the hysteresis loop. In the fuzzy control rules, the deviation and its changing rate of actual current from instruction current are input variables and the hysteresis loop width is output one. The hysteresis loop width can be regulated by fuzzy control based on the compensation requirements. PSIM simulation results show that the ability of APF to track harmonic current is improved by the method, especially when harmonic current comes through the zero and vertex points. Experiments verify the practicability of this method on eliminating harmonics.