S-transform-based Hybrid Active Filter for Mitigation of Current Harmonics

Abstract

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