模块化多电平变流器子模块电压分组检测中过电压防护策略

doi:10.19595/j.cnki.1000-6753.tces.180774

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Abstract For the over-voltage problem in sub-module of modular multilevel converter (MMC) with reduced sensors, this paper proposes a sub-module over-voltage protection strategy. First of all, it is pointed out that the sub-module voltage not being directly measured in real-time is the cause of over-voltage. Then, the necessity of pre-detection of sub-module voltage before load access operation is studied. The sub-module over-voltage detection and prevention strategy during load access operation are proposed. Finally, case studies are performed on a 31-level single-phase MMC in Matlab/Simulink. Meanwhile, a 9-level single-phase MMC laboratory prototype is built to verify the effectiveness of this strategy. The simulation and experimental results show that the over-voltage protection strategy proposed in this paper can achieve good overvoltage protection effect when the capacitance parameters are consistent and deviated, and has strong parameter adaptability.

Key words： Modular multilevel converter (MMC) grouping measurement voltage observation submodule over-voltage

Received: 03 May 2018 Published: 29 July 2019

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TM46

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	Articles by authors
	Luo Derong
	He Ruizhi
	Huang Shoudao
	Zhang Zhigang
	Hou Weiyang

Cite this article:

Luo Derong,He Ruizhi,Huang Shoudao等. Over-Voltage Protection Strategy for Sub-Module of Modular Multilevel Converter with Reduced Sensors[J]. Transactions of China Electrotechnical Society, 2019, 34(14): 2957-2969.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.180774 OR https://dgjsxb.ces-transaction.com/EN/Y2019/V34/I14/2957

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