三相并联型有源电力滤波器预测直接功率控制

针对传统直接功率控制开关频率不固定的问题,提出一种电网平衡条件下有源电力滤波器的预测直接功率控制策略.以有源电力滤波器交流侧输出电压为控制对象,通过一定的预测算法计算出有源电力滤波器交流侧参考输出电压,以保证瞬时功率跟踪功率参考值.利用空间矢量脉宽调制( SVPWM)方法控制有源电力滤波器的交流侧输出电压跟踪该参考电压.仿真比较分析,预测直接功率控制比传统直接功率控制具有更优越的谐波抑制效果.研制了实验样机证明了所提出的预测直接功率控制方法的正确性和可行性.

Predictive direct power control of three-phase shunt active power filter

Aiming at the switching frequency fluctuation of traditional direct power control(DPC),a DPC scheme of a three-phase active power filter(APF) is proposed based on predictive algorithm.In order to make instantaneous power track the reference value,it used APF AC side output voltage as control object and calculated its reference value by a certain predictive algorithm.Then using space vector pulse width modulation(SVPWM) method,the output voltage was obtained from APF AC side which tracked the calculated reference value.By simulation analysis it is verified that predictive direct power control has more superior harmonic suppression effect than traditional direct power control,because it overcomes switching frequency fluctuation.The prototype experiment proves that the proposed control methods is correct and feasible.