一种具有直流故障限流能力的模块化多电平换流器

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Abstract In view of DC fault current isolation deficiency for the conventional half-bridge sub- modules (HBSM) based modular multilevel converter (MMC), a novel topology of improved sub-module based MMC is proposed. Different from HBSM, an extra IGBT device together with its bypass snubber circuit are arranged in the AC output port of the improved sub-module. Followed by the analysis of the operation principles, detailed study of the fault current blocking mechanism and the electrical stress of the key power switches were carried out. Moreover, the feasibility of the proposed improved sub-module based MMC and the fault protection theory were also verified. Simulation results show that, the proposed MMC employs the original control and modulation strategies under the normal operation condition compared with the conventional MMC. Moreover, under fault condition, the improved sub-module based MMC is able to effectively block the fault current and reduce the consistency requirement of the trigger pulses by adopting the bypass snubber circuits. Thus it shows good application prospect in the future HVDC transmission system.

Key words： Modular multilevel converter sub-module DC fault current limiting HVDC transmission

Received: 20 August 2016 Published: 29 March 2017

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TM46

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	Articles by authors
	Hao Ruixiang
	Yang Xiaofeng
	Xue Yao
	Chen Bowei
	Lin Zhiqin
	Sun Hu

Cite this article:

Hao Ruixiang,Yang Xiaofeng,Xue Yao等. A Novel Modular Multilevel Converter with DC Fault Current Limiting Capability[J]. Transactions of China Electrotechnical Society, 2017, 32(6): 172-180.

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https://dgjsxb.ces-transaction.com/EN/ OR https://dgjsxb.ces-transaction.com/EN/Y2017/V32/I6/172

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