基于零序注入的NPC三电平变流器中点电位反馈控制

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Abstract Output AC voltage compensation and neutral point voltage feedback control under neutral point voltage unbalanced conditions are discussed. A neutral point voltage feedback control strategy based on zero sequence injection is proposed. Using this strategy, not only output voltage can be guaranteed no distortion but also neutral point voltage can be adjusted at will. The modulation strategy is based on SPWM principal, so it’s very simple to realize, and suitable for enhancing traditional neutral point balance control or applications where need to control up and down DC link voltage separately. The neutral point current control ability of the strategy is given, and the neutral point voltage low frequency fluctuation problem is also analyzed. Simulation and experimental results verify the correctness of this theory.

Key words： Unbalance compensation feedback control neutral point balance neutral point offset neutral point clamp(NPC) three-level converter sinusoidal pulse width modulation(SPWM) zero sequence voltage

Received: 17 May 2012 Published: 20 March 2014

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TM464

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	Articles by authors
	Xie Luyao
	Jin Xinmin
	Wu Xuezhi
	Yin Jingyuan
	Tong Yibin

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Xie Luyao,Jin Xinmin,Wu Xuezhi等. Neutral Point Voltage Feedback Control Based on Zero Sequence Injection for NPC Three-level Converter[J]. Transactions of China Electrotechnical Society, 2012, 27(12): 117-128.

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http://dgjsxb.ces-transaction.com/EN/ OR http://dgjsxb.ces-transaction.com/EN/Y2012/V27/I12/117

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