自阻自均压模块化多电平换流器子模块拓扑及控制

doi:10.19595/j.cnki.1000-6753.tces.190751

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Abstract High-voltage DC transmission based on modular multilevel converters (MMC) needs to deal with possible short-circuit faults on the DC line and the capacitor voltage balance problem caused by too many sub modules. To ensure sub modules working independently as a constraint, the paper first analyzes the full bridge topology fault suppression mechanism. Then a sub module topology with DC link fault blocking and internal capacitor balance ability is designed based on the fault clamp circuit and switch capacitor multilevel ideas. Thus, it will not only meet the self-suppression requirement but also reduce the number of capacitors participating in the sort balancing algorithm to half. What is more, for the self blocking and voltage balance topology, the DC link fault suppression characteristics under two different blocking modes, i.e. self-balancing control strategy based on the voltage level output priority and the unblocking DC link fault suppression strategy, are also studied. Finally, a PSCAD-EMTDC simulation model is used to verify the effectiveness of the proposed topology of DC link fault suppression and control strategy.

Key words： Modular multilevel converter DC fault suppression self-block and balance sub module topology unblocking suppression

Received: 21 June 2019

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TM46

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	Zhang Jianpo
	Cui Diqiong
	Tian Xincheng
	Zhao Chengyong

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Zhang Jianpo,Cui Diqiong,Tian Xincheng等. Self-Block and Voltage Balance Modular Multilevel Converter Sub Module Topology and Control[J]. Transactions of China Electrotechnical Society, 2020, 35(18): 3917-3926.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.190751 OR https://dgjsxb.ces-transaction.com/EN/Y2020/V35/I18/3917

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