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分析了低通滤波器用于串联型电力有源滤波器时的特殊性 ,建立了分频段仿真电路模型并且提出了分频段设计方法。利用该方法 ,为一台 15 k W样机设计的低通滤波器取得了较为满意的结果。为进一步消除开关纹波 ,提出了在低通滤波器中引入陷波滤波器的改进方法。仿真和实验结果表明 ,加了陷波滤波器后 ,低通滤波器的滤波特性得到了很大改善。陷波滤波器的设计方法在文中也作了介绍。
The particularity of the low pass filter used in the series active power filter is analyzed. The simulation model of the sub - band is established and the design method of the sub - band is proposed. With this method, the low-pass filter designed for a 15 kW prototype has achieved satisfactory results. In order to further eliminate the switching ripple, an improved method of introducing a notch filter in a low-pass filter is proposed. The simulation and experimental results show that the filter characteristics of the low-pass filter have been greatly improved after the notch filter is added. The design method of notch filter is also introduced in this paper.