兼备故障限流及开断功能的直流电网集成化关键设备发展现状及展望

Development Status and Prospect of Integrated Key Equipment of DC Power Grid With Fault Current Limiting and Breaking Functions

直流断路器(direct current circuit breaker,DCCB)及直流故障限流器(fault current limiter,FCL)是2种构建柔性直流电网所必需的关键设备,对2种装备进行集成化设计及研究可以有效降低投入成本及占地面积。该文首先对直流电网关键设备进行概述;其次,分析DCCB及FCL单独接入直流系统所需面对的技术及经济问题;再次,对已有的集成化关键设备拓扑结构及接入方案进行详述,并在PSCAD/EMTDC软件中搭建张北直流电网模型,对不同方案进行仿真对比;最后,对直流电网关键设备的发展进行展望。

Direct current circuit breaker and fault current limiter are two kinds of key equipment necessary for the construction of flexible DC power grid.The integrated design and research of the two equipment can effectively reduce investment cost and floor space.Firstly,this paper summarized the key equipment of DC power grid.Secondly,the technical and economic problems that DCCB and FCL need to face were analyzed,when they are connected to DC system separately.Thirdly,the topological structure and access scheme of the existing integrated key equipment were described in detail,and the Zhangbei DC power grid model was built in PSCAD/EMTDC software to simulate and compare different schemes.Finally,the development of key equipment of DC power grid was prospected.