二极管钳位型三电平逆变器共模电压抑制

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Abstract Neutral point clamped (NPC) three-level inverter is a widely used multilevel inverter topology. The neutral-point potential imbalance is the main drawback of NPC three-level inverter. The traditional NTV² modulation strategy can control the voltage balance over the full range of inverter output voltage. However, the inverter output side will produce high common-mode voltage. This paper proposes a new NTV² modulation strategy to solve the high common-mode voltage problem generated by the traditional NTV² modulation. This modulation selects the basic voltage vector that generates smaller common-mode voltage to synthesis a new small virtual vector and middle virtual vector. At the same time, the duty ratio method is put forward, to reduce and fix the switching frequency of the new NTV² modulation. The simulation and experimental results show that the new NTV² modulation can effectively suppress common-mode voltage, and it can also control the neutral-point voltage balance over the full range of inverter output voltage.

Key words： Three-level inverter common-mode voltage neutral-point potential balance nearest three virtual vectors phase duty cycle method

Received: 31 December 2013 Published: 30 December 2015

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TM464

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	Wu Keli
	Xia Changliang
	Zhang Yun
	Gu Xin

Cite this article:

Wu Keli,Xia Changliang,Zhang Yun等. Common-Mode Voltage Suppression for Neutral-Point-Clamped Three-Level Inverter[J]. Transactions of China Electrotechnical Society, 2015, 30(24): 110-117.

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https://dgjsxb.ces-transaction.com/EN/ OR https://dgjsxb.ces-transaction.com/EN/Y2015/V30/I24/110

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