并联有源电力滤波器交流侧输出滤波器设计

The AC side output filter design of shunt active power filter

针对输出滤波器存在的放大网侧电流畸变率、阻尼电阻发热严重的问题,提出一种工程化有源电力滤波器交流侧输出滤波器参数设计方法。采用二阶高通滤波器作为有源电力滤波器输出滤波器拓扑,在综合考虑输出滤波器的开关纹波滤波效果与电流畸变率、电容无功容量、电阻功耗之间关系的基础上,结合理论分析、仿真、实验研究,设计总结了并联有源电力滤波器输出滤波器的参数选择方法。采用该方法为50kVA并联有源电力滤波器设计了一套输出滤波器。实验结果表明:加装输出滤波器后,电流纹波抑制到滤波前的1/4以下,网侧电流畸变率增大约1个点,滤波电阻上90%以上的工频电流被旁路,电阻发热得到有效控制,实验结果验证了该输出滤波器设计方法的有效性。

In order to resolve the problems of grid side current distortion amplification and damping resistance heating,an engineering design method of active power filter ac side output filter was proposed.Second order high-pass filter was selected as the topology of active power filter output filter.This paper discussed the design method of output filter based on comprehensive consideration of switching ripple current filtering,total harmonic distortion（THD）,var of capacitor,power loss of output filter through theoretical analysis and simulation.The proposed method was used to design an output filter for a 50 kVA shunt active power filter.The results show that current ripple remains 1/4 of that before filtering,grid current THD rises about a point and damping resistor heating is controlled effectively through bypassing more than 90% frequency current.The results prove the validity of the proposed method.