Sewan Choi, Minsoo Jang, “A Single Phase Inverter - Zigzag Transformer Hybrid Filter to Suppress Neutral Harmonic Currents in Three-Phase Four-Wire Systems”
Abstract : This paper proposes a new hybrid filter to
suppress neutral harmonic currents in three-phase
four-wire systems. The compensation characteristics
illustrate that the proposed scheme works well not only
with harmonic voltage-source loads but also with
harmonic current-source loads. Under unbalanced
loading, the proposed filter eliminates only harmonics in
the neutral current while it does not affect the
fundamental. The VA rating of the inverter is
significantly reduced compared to the conventional one.
The experimental results on a prototype validate the
proposed control approach.