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柔性直流配电系统故障分析及限流方法

DOI: 10.13334/j.0258-8013.pcsee.2015.12.013, PP. 3026-3036

Keywords: 直流配电,故障分析,故障限流,故障隔离,超导限流器

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Abstract:

直流配电系统的故障隔离是保障直流系统供电可靠性的关键技术。分析直流配电系统直流故障时的暂态特性,指出故障持续过程中直流电容放电、续流二极管自然换向导通和二极管同时导通三个阶段对交流系统、换流器以及直流侧的影响,并以此为依据提出直流系统故障隔离对保护和直流断路器动作的技术要求和难点。提出基于电阻型超导限流器的直流故障限流方法,对直流线路、交流系统和换流器内部续流二极管均可起到限流作用,从而降低直流系统对直流故障保护方案的速动性要求和设计难度,同时也降低对直流断路器的动作时间和开断容量要求。利用Matlab/Simulink对直流配电系统短路故障进行仿真测试,验证了直流系统的故障暂态特征和所提限流方法的有效性。

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