S-transform-based Hybrid Active Filter forMitigation of Current Harmonics

Abstract

This article presents a new control strategy for the hybrid active filter usingS-transform. Frequency-domain analysis employing S-transform is used to extract thefundamental component of the non-linear load current. The switching patterns forthe active filter are generated with pulse-width modulation. The proposed technique issimple and has better performance, even with low switching frequency, as compared totime-domain techniques. Simulation results are presented for steady-state and transientconditions, and the hybrid active filter is effective in maintaining the source currentharmonics within the limits.