模块化多电平换流器环流及抑制策略研究

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Abstract Modular multilevel converter(MMC) is a new circuit topology to realize multilevel converters. Major advantages of MMC are high modularity, longer maintenance intervals, low generation of harmonics, etc. However the circulation current which is aroused by it’s structure distorts the leg currents and increases the rated current of power devices, which increases system cost and unnecessary power lost. Based on the leg current equations, this paper firstly analyses the circulation current form reasons from different aspects and, then the quantitative relationship between the leg current, dc bus current and circulation current is derived. Secondly, through the deep analysis, the double base frequency characteristic for the circulation current is deduced. In order to reduce or suppress the circulation current, three measures, a modified voltage balancing algorithm, a circulation current restrain controller based on proportional resonant(PR) and a leg current filter, are developed according to it’s forming reasons and characteristic without changing the leg inductance. At last, the simulation model of MMC with 21 voltage levels by PSCAD/ EMTDC is realized to verify its effectiveness.

Key words： Modular multilevel converter circulation current PR control double base frequency characteristic

Received: 12 April 2012 Published: 25 March 2014

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TM315

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	Zhang Jianpo
	Zhao Chengyong

Cite this article:

Zhang Jianpo,Zhao Chengyong. Research on Circulation Current and Suppressing Strategy of Modular Multilevel Converter[J]. Transactions of China Electrotechnical Society, 2013, 28(10): 328-336.

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http://dgjsxb.ces-transaction.com/EN/ OR http://dgjsxb.ces-transaction.com/EN/Y2013/V28/I10/328

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