Hybrid DC Circuit Breaker and Fault Current Limiter With Optional Interruption Capability
Hybrid DC Circuit Breaker and Fault Current Limiter With Optional Interruption Capability
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DOI：
10.1109/tpel.2017.2690960
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发表时间：
2018-03
影响因子：
6.7
通讯作者：
Davood Keshavarzi;E. Farjah;T. Ghanbari
中科院分区：
文献类型：
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作者：
Davood Keshavarzi;E. Farjah;T. Ghanbari
由于大部分可再生能源是直流型的，直流微电网在放松管制的电力系统中越来越受到重视，以提高系统的可靠性和效率。在直流微电网中，电流和电压不存在过零点，因此断路和故障限流是一个重要的问题。传统的基于晶闸管的直流故障限流器是解决这个问题的有吸引力的解决方案。然而，它们在临时故障的情况下对系统施加永久中断。本文提出了一种新型的混合式断路器（HCB），通过对永久性和暂时性故障采取不同的限制行为来改善系统的电能质量。正常情况下，拟议的HCB通过机械断路器（MCB）传输负载功率。在HCB的两侧发生故障时，故障电流从MCB转移到包含零电压开关（ZVS）过渡机制的限流路径。HCB在预定义的持续时间内限制故障电流，然后中断故障馈线。在临时故障的情况下，电流返回到ZVS中的MCB。讨论了HCB在不同运行方式下的工作原理。所提出的六氯苯的能力进行了测试和验证的原型进行了不同的实验。
Since most of renewable energy resources are dc type, dc microgrids find more attention in deregulated power systems for improvement of reliability and efficiency of the system. In dc microgrids, there is no zero-crossing in current and voltage; so the circuit breaking and fault current limiting are serious concerns. Conventional thyristor-based dc fault current limiters are attractive solutions for tackling this problem. However, they impose permanent interruption on the system in case of temporary fault. In this paper, a novel hybrid circuit breaker (HCB) is proposed to improve power quality of the system by adopting different limiting behaviors for permanent and temporary faults. The proposed HCB transfers load power through a mechanical circuit breaker (MCB) under normal condition. Upon fault occurrence in both sides of the HCB, the fault current is transferred from the MCB to a current limiting path incorporating a zero voltage switching (ZVS) transition mechanism. The HCB limits the fault current for a predefined duration and then interrupts the faulty feeder. In case of temporary fault, the current is returned to the MCB in ZVS. The HCB operation principle is discussed in different operation modes. Capabilities of the proposed HCB are tested and verified by different experiments carried out on a prototype.