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.