柔性直流电网中直流故障特性分析及线路故障重启策略

doi:10.19595/j.cnki.1000-6753.tces.L80093

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Abstract DC-side faults are the key issue of HVDC transmission based on modular multilevel converters(MMC), and in particular HVDC transmission is popularized for overhead line applications. In this paper, the characteristics of DC short-circuit faults are studied for a flexible DC power system. The half-bridge MMC fault equivalent circuit is established and the corresponding over-current analytical equation is deduced. The working mode of the hybrid DC circuit breaker breaking fault current is studied. A hybrid DC circuit breaker is used to propose a line reclosing strategy. On the PSCAD/EMTDC platform, a DC grid system simulation model was built to verify the effectiveness and feasibility of the proposed scheme. The results show that after the hybrid circuit breaker recloses, within 0.1s, the power of each converter station recovers and maintains stable operation. The DC grid can cross the short-circuit fault quickly and steadily.

Key words： DC fault protection strategy hybrid DC circuit breaker modular multilevel converter (MMC) overhead line

Received: 01 July 2018 Published: 29 July 2019

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TM721

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	Su Jianshen
	Guo Jingdong
	Jin Tao

Cite this article:

Su Jianshen,Guo Jingdong,Jin Tao. DC Fault Characteristics and Line Fault Recovery Strategy in Flexible DC Power Network[J]. Transactions of China Electrotechnical Society, 2019, 34(zk1): 352-359.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.L80093 OR https://dgjsxb.ces-transaction.com/EN/Y2019/V34/Izk1/352

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