机械式直流断路器性能分析及谐振换流方法

doi:10.19595/j.cnki.1000-6753.tces.211871

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Abstract Mechanical DC circuit breaker (DCCB) is one of the mainstream solutions for DC interruption. However, the flexible DC system constructed by the offshore wind power puts forward the requirements of lightness and compactness for the mechanical DCCB. The performance analysis shows that current mechanical DCCB has some problems, such as high withstand voltage requirements of pre-charging system, high capacitance of pre-charging capacitor, high loss rate of pre-charging energy, long commutation time, unstable arc extinguishing at small current and so on. Therefore, a resonant mechanical DC circuit breaker (RM-DCCB) is proposed. By controlling the turn-on time of thyristor and using its zero-crossing self-turn-off characteristics, energy is successively injected into the commutation path, and the resonant current with increasing amplitude is generated. The commutation characteristics, mathematical model and parameter design method of RM-DCCB are studied. Through PSCAD/EMTDC simulation, the interruption feasibility of RM-DCCB and the correctness of parameter design are verified. The research shows that RM-DCCB is a new commutation method with comprehensive technical advantages.

Key words： Mechanical DC circuit breaker injected energy resonant current commutation characteristics parameter design method

Received: 17 November 2021

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TM561

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	Li Bin
	Li Pengyu
	Wen Weijie
	Liu Haijin

Cite this article:

Li Bin,Li Pengyu,Wen Weijie等. Performance Analysis and Resonant Commutation Method of Mechanical DC Circuit Breaker[J]. Transactions of China Electrotechnical Society, 2022, 37(9): 2139-2149.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.211871 OR https://dgjsxb.ces-transaction.com/EN/Y2022/V37/I9/2139

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