低通滤波器在串联型电力有源滤波器中的应用

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，建立了分频段仿真的电路模型并且提出了分频段设计方法。利用该方法，为一台15kW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。

APPLICATION OF PASSIVE LOW-PASS FILTERS IN SERIES ACTIVE POWER FILTER

Starting with the viewpoint of application, the peculiarity of applying low-pass filter (LPF) to series active power filter (SAPF) is analyzed. Then the simulation models of LPF for different frequency bands are established and the design method for different frequency band is put forward. With this method the design of a LPF for a prototype with capacity of 15kW is satisfied. To further reduce the ripples caused by the operation of circuit breaker this LPF is ameliorated by use of damp filter. In this paper the simulations are performed under the circumstance of PSPICE. The results of experiments show that by use of damp filter the filtration characteristic of LPF is outstandingly improved. In this paper the method of designing damp filter is also described.