Single-phase hybrid active power filter using single switch parallel active filter and simple passive filter

This paper presents an implementation of hybrid active power filter for minimizing the input current distortion in a single-phase system feeding a non-linear load. In this method, the active power filter is injecting equal but opposite current to mitigate the distortion current shape the supply current to a sinusoidal form and in phase with the supply voltage. In this work, the single-switch parallel active power filter is used to reduce switching stress, losses and also the cost. Studies are performed to evaluate the performance of this topology in conjunction with a simple passive filter in a hybrid arrangement using two components; a parallel active power filter and a passive filter for removing both high order and low order harmonics. The passive filter uses simple LC configuration; whilst the parallel active filter uses a single-switch topology typically used in boost rectifier circuit. Theoretical, simulation and experimental result are presented to prove the validity of this arrangement.