Current harmonics cancellation in three-phase four-wire systems by using a four-branch star filtering topology

Abstract

This paper presents a new solution for filtering current harmonics in three-phase four-wire networks. The original four-branch star (FBS) filter topology presented in this paper is characterized by a particular layout of single-phase inductances and capacitors, without using any transformer or special electromagnetic device. Via this layout, a power filter, with two different and simultaneous resonance frequencies and sequences, is achieved—one frequency for positive-/negative-sequence and another one for zero-sequence components.