直流混合型超导限流器强迫换流方法研究

Study on forced commutation method of DC hybrid superconducting fault current limiter

针对现有断路器开断容量不能满足现代舰船直流电力系统短路电流分断要求的现状,提出了一种直流混合型超导限流器的方案。舰船直流电力系统短路电流上升率高达20 A/μs,该限流器需要完成短路电流的快速换流,研究了强迫换流方法。讨论了直流混合型超导限流器的工作原理,对限流器的限流过程进行了分析。在给定电力系统短路电流参数的条件下,结合电路仿真软件,对辅助换流支路参数进行了设计。实验结果表明,强迫换流的方法在38μs内完成了上升率为20.4 A/μs的7 680 A的短路电流的换流,混合型方案具有可行性,强迫换流的方法能够实现短路电流的快速换流。

The existing circuit breaker capacity can＇t satisfy the status of modem ship DC power system short-circuit current disjunction. According to that, this paper proposes a hybrid type DC superconducting current limiter scheme; according to that short-circuit current rise rate of ship DC electric system is as high as 20A/μs, the current limiter needs to complete rapid commutation of short circuit current, thus it researches the forced commutation method. This paper discusses the working principle of DC hybrid type superconducting current limiter and analyzes its limiting process. Under the condition of given parameters of power system short-circuit current, and combined with the circuit simulation software, the auxiliary commutation circuit branch parameters are designed. The experimental results show that the forced commutation method completes the communication of 7 680 A short-circuit current with rise rate 20.4 A/Bs in 38 μs, the hybrid scheme is feasible, and the forced commutation method can achieve rapid communication of short circuit current. This work is supported by National Natural Science Foundation of China （No. 51607185）.