A Comparative Study on Different Types of Hybrid Active Power Filters

Most common problem arising in supply network is current harmonics because of the increased use of nonlinear loads. Traditionally passive and active filters are best solutions for harmonic removal, but they have some practical limitations. Solution to these limitations is to use hybrid active power filters (HAPF) which are different combinations of passive and/or active filters. HAPF inherit the efficiency of passive filters and the improved performance of active filters. In HAPF, filtering characteristics of passive filter is improved by active power filter. Three different types of HAPF are discussed in this paper. All topologies are presented and are verified via simulation study in PSIM software. Performance parameters of all the topologies are compared based on supply current THD, load voltage THD and fundamental voltage/current values for similar supply and load conditions.