模块化多电平换流器改进拓扑结构及其应用

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Abstract Modular multilevel converter(MMC) based on cascaded connection of sub modules per phase arm is a newly introduced topology of multilevel converter for multilevel converters with potential for medium voltage and high voltage applications with advantages as high modularity, longer maintenance intervals, low generation of harmonics, etc. However, MMC by itself, is defenseless against DC faults, during such faults, the anti-parallel diodes conduct as rectifier bridges because the fault current continues to be fed, and so the application especially in the high voltage direct current (HVDC) transmission is affected. In this paper, different topologies of sub modules(SM) of MMC are analyzed, according to the relationship between arm current and the capacitance voltage, the series connected double SM(SDSM) is designed, the DC current blocked capability is realized without changing the control strategy. At last, the simulation model is built based on this new topology, the DC current fault characters and the control strategy is analyzed.

Key words： Modular multilevel converter high voltage direct current sub module topology series connected double sub module DC current block

Received: 27 May 2013 Published: 05 November 2014

PACS:	TM721
	TM46

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	Articles by authors
	Zhang Jianpo
	Zhao Chengyong
	Sun Haifeng
	Huang Xiaoming
	Lu Yi
	Qiu Peng

Cite this article:

Zhang Jianpo,Zhao Chengyong,Sun Haifeng等. Improved Topology of Modular Multilevel Converter and Application[J]. Transactions of China Electrotechnical Society, 2014, 29(8): 173-179.

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http://dgjsxb.ces-transaction.com/EN/ OR http://dgjsxb.ces-transaction.com/EN/Y2014/V29/I8/173

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