微网保护策略分析  

Analysis of Microgrid Protection Strategy

作　　者：成凤东 张聪[1] 

机构地区：[1]东北电力大学电气工程学院,吉林吉林132012

出　　处：《电气开关》2016年第1期1-4,共4页Electric Switchgear

摘　　要：将分布式电源(DG)组成微网(MG)并入大容量配电网,已成为现有电力系统的一种必然趋势。传统辐射型配网通过简单的保护装置即可实现对网络的保护,如熔断器、重合闸及过电流继电器(OCR)等。由于DG及MG的接入,改变了整体网络的潮流分布,配网从单电源辐射网向多源网络转变,引起了网内多向潮流,同时也影响了故障电流的大小和方向,并对保护协调问题产生重大影响。综合评述了配电系统的传统保护方案及微网保护所面临的挑战,并探讨了微网备用保护策略。Incorporation of Microgrid（ MG） comprising of distributed generators（ DGs）,in the existing bulk power system has become an inevitable trend. The traditional distribution network designed to operate radially is protected by simple protective devices such as fuses,reclosers and over-current relays（ OCRs）. The presence of DG and MG changes the load-flow of the overall network and also influences the fault current magnitude and direction. This changes the distribution system from single supply radial system to multi-source network which causes the multidirectional power flow and also having significant impact on protection coordination issues. This paper proposes a comprehensive review on thetraditional protection scheme of the distribution system and the challenges associated with the MG protection system along with the discussion of some backup protection strategies.

关 键 词：微电网 过电流继电器 熔断器-重合闸 广域保护 

分 类 号：TM71[电气工程—电力系统及自动化]