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.
CitacióRodriguez, P. [et al.]. Current harmonics cancellation in three-phase four-wire systems by using a four-branch star filtering topology. "IEEE transactions on power electronics", Agost 2009, vol. 24, núm. 8, p. 1939-1950.