一种优化的模块化多电平换流器电压均衡控制方法

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Abstract Modular multilevel converter based HVDC (MMC-HVDC) is a new generation VSC-HVDC topology invented by Siemens. The problem of voltage balancing among the submodules (SM) is difficult to solve. The traditional method, which uses the sorting results of the SM capacitor voltages and fires the IGBTs directly, leads to relatively higher power losses. This paper proposes an improved voltage balancing control method, which reduces the switching operation significantly and the switching losses of the converter decreases consequently. The model of MMC-HVDC with 20 SMs is realized by PSCAD/EMTDC, and the traditional and improved voltage balancing control methods are compared. The simulation results demonstrate that the model is reasonable and the improved method is effective.

Key words： Modular multilevel converter sub modules voltage balancing switching frequency switching losses

Received: 29 October 2009 Published: 07 March 2014

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TM46

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	Articles by authors
	Tu Qingrui
	Xu Zheng
	Zheng Xiang
	Zhang Jing

Cite this article:

Tu Qingrui,Xu Zheng,Zheng Xiang等. An Optimized Voltage Balancing Method for Modular Multilevel Converter[J]. Transactions of China Electrotechnical Society, 2011, 26(5): 15-20.

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http://dgjsxb.ces-transaction.com/EN/ OR http://dgjsxb.ces-transaction.com/EN/Y2011/V26/I5/15

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