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A new three-phase harmonic-free rectification scheme based on zero-sequence current injection

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3 Author(s)
Sewan Choi ; Dept. of Control & Instrum. Eng., Seoul Nat. Univ. of Technol., South Korea ; Chung-Yuen Won ; Gyu-Sik Kim

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 are detailed. Experimental results on a 1.5-kVA prototype are provided to validate the proposed technique.

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Industry Applications, IEEE Transactions on  (Volume:41 ,  Issue: 2 )