Performance Analysis and Resonant Commutation Method of Mechanical DC Circuit Breaker
Li Bin1, Li Pengyu1, Wen Weijie1, Liu Haijin2
1. Key Laboratory of the Ministry of Education on Smart Power Grids Tianjin University Tianjin 300072 China; 2. Electric Power Research Institute of State Grid Shanxi Electric Power Company Taiyuan 030000 China
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.
李斌, 李鹏宇, 温伟杰, 刘海金. 机械式直流断路器性能分析及谐振换流方法[J]. 电工技术学报, 2022, 37(9): 2139-2149.
Li Bin, Li Pengyu, Wen Weijie, Liu Haijin. Performance Analysis and Resonant Commutation Method of Mechanical DC Circuit Breaker. Transactions of China Electrotechnical Society, 2022, 37(9): 2139-2149.
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2022, Vol. 37 
