Se-Wan Choi, Chung-Yeun Won, Gyu-Sik Kim, “A New Three-Phase Harmonic-Free Rectification Scheme Based on Zero-Sequence Current Injection”
Abstract : This paper proposes a new three-phase harmonic-free
rectification scheme based on a zero-sequence injection technique.
The proposed scheme incorporates two half-bridge inverters and
two single-phase transformers to actively and individually shape
the positive and negative dc rail currents of the rectifier. The
shaped zero-sequence harmonic currents are then circulated
through the ac side of the rectifier via a zigzag transformer,
resulting in pure sinusoidal input currents in the three-phase
diode rectifier. A design example along with component ratings
calculation is detailed. Experimental results on a 1.5kVA
prototype are provided to validate the proposed technique.
Keywords : zero-sequence; current injection; harmonic reduction;
three-phase diode rectifier