基于状态量信息的含分布式电源配电网保护新方案  

Novel protection scheme based on status information for distribution network with DGs

作　　者：陈晓龙[1] 李永丽[1] 孙景钌 CHEN Xiaolong;LI Yongli;SUN Jingliao(Key Laboratory of Smart Grid of Ministry of Education,Tianjin University,Tianjin 300072,China;State Grid Zhejiang Electric Power Company Wenzhou Electric Power Supply Company,Wenzhou 325200,China)

机构地区：[1]天津大学智能电网教育部重点实验室,天津300072 [2]国网浙江省电力有限公司温州供电公司,浙江温州325200

出　　处：《电力自动化设备》2018年第12期135-139,154,共6页Electric Power Automation Equipment

基　　金：国家重点基础研究发展计划(973计划)项目(2009-CB219704)~~

摘　　要：为消除分布式电源(DG)接入对保护的影响,同时尽量减少改造成本,提出了一种基于多点状态量信息的含DG配电网保护新方案。对于DG下游辐射状线路和无DG接入的馈线,所提方案根据过电流保护动作信息实现故障定位。另外,基于馈线首端和DG并网点处的电压和电流信息,提出了补偿阻抗极性信息的新判据及其故障定位方法。当DG上游区域发生故障时,所提方案无需加装电压互感器,即可快速准确地切除DG上游区域的故障线路。最后,通过PSCAD/EMTDC软件对一个含DG的10 kV配电网进行故障仿真与分析,结果验证了所提方案的有效性和正确性。In order to eliminate the impact of DG(Distributed Generation)on protection and reduce the improvement cost as much as possible,a novel protection scheme based on multi-point status information for distribution network with DGs is proposed. For radial lines in the downstream area of DG and the feeders without DG access,the scheme can rapidly and accurately realize the fault location according to the action information of over-current protection. Moreover,a new criterion of the polarity information of compensation impedance and the corresponding fault locating method are proposed based on the voltage and current information at the head of feeder and the point of common coupling. When the fault occurs in the upstream area of DG,the proposed scheme can rapidly and accurately isolate the fault lines without additional potential transformer. Finally,the faults on a 10 kV distribution network with DGs are simulated and analyzed by PSCAD/EMTDC,and the results verify the effectiveness and correctness of the proposed scheme.

关 键 词：分布式电源 配电网 过电流保护动作信息 补偿阻抗极性信息 故障定位 

分 类 号：TM77[电气工程—电力系统及自动化]