直流电容电压自平衡的新型五电平NPC变流器空间矢量调制策略

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Abstract DC capacitor voltage balance is one of the key issues in the control of five-level NPC (neutral point clamped) converter. In this paper, it analyses the influence of space vectors to the DC voltage balance in five-level NPC converter SVM(space vector modulation) strategy and explains the control thought of using different scheme to realize five-level SVM strategy in different modulation ratio region. Furthermore, it presents a novel DC capacitor voltage self-balancing SVM strategy of five-level NPC converter. The novel strategy divides the whole five-level space vector diagram into low modulation ratio region(m_SV≤0.5) and high modulation ratio region(m_SV>0.5). In low modulation region, it presents a DC capacitor voltage self-balancing SVM strategy which combines objective function scheme with reference voltage decomposition scheme. In high modulation area, it achieves DC capacitor voltage self-balancing SVM strategy by applying an optimal balancing vector selection (OBVS) scheme. Simulation and experimental results verify the DC voltage balancing characteristics of the proposed five-level NPC SVM strategy. The novel SVM strategy also has the characteristics of smaller amount of calculation, much simpler realization and better control effect.

Key words： DC capacitor voltage balance five-level NPC converter objective function reference voltage decomposition optimal balancing vector selection scheme

Received: 01 April 2013 Published: 10 April 2015

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TM464

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	Articles by authors
	Li Ning
	Wang Yue
	Li Su
	Yao Weizheng
	Zhang Jian
	Liu Gang
	Wang Zhaoan

Cite this article:

Li Ning,Wang Yue,Li Su等. DC Capacitor Voltage Self-Balancing Space Vector Modulation Strategy of Five-Level NPC Converter[J]. Transactions of China Electrotechnical Society, 2015, 30(6): 178-189.

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http://dgjsxb.ces-transaction.com/EN/ OR http://dgjsxb.ces-transaction.com/EN/Y2015/V30/I6/178

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