补偿线路分布电容电流的柔性直流配电网电流差动保护方法  

Current differential protection method of line distributed capacitance current compensation in flexible DC distribution network

作　　者：杨鹏 贾伯岩 臧谦 范辉 李秉宇 张鹏 李晔 刘晓明 YANG Peng;JIA Boyan;ZANG Qian;FAN Hui;LI Bingyu;ZHANG Peng;LI Ye;LIU Xiaoming(State Grid Hebei Electric Power Co.,Ltd.,Shijiazhuang,Hebei 050021,China;State Grid Hebei Electric Power Research Institute,Shijiazhuang,Hebei 050021,China;State Key Laboratory of Reliability and Intelligence of Electrical Equipment,Hebei International Joint Research Center for Reliability and Intelligence of Modern Electrical Equipment,School of Electrical Engineering,Hebei University of Technology,Tianjin 300130,China)

机构地区：[1]国网河北省电力有限公司,河北石家庄050021 [2]国网河北省电力有限公司电力科学研究院,河北石家庄050021 [3]省部共建电工装备可靠性与智能化国家重点实验室,河北省现代电工装备可靠性与智能化国际联合研究中心,河北工业大学电气工程学院,天津300130

出　　处：《福州大学学报（自然科学版）》2023年第1期49-55,共7页Journal of Fuzhou University(Natural Science Edition)

基　　金：国家电网有限公司科技资助项目(kj2020-078);国家自然科学基金(面上)资助项目(52177139)。

摘　　要：针对系统接线方式和线路分布电容影响导致柔性直流配电网故障辨识困难的问题,在对传统电流差动保护在柔性直流配电网中的适用性分析基础上,利用线路贝瑞隆模型推得故障点电流与直流线路两端差电流之间的关系.进一步地,提出具有线路分布电容电流补偿的新型电流差动保护方案,解决对称单极接线方式下故障特征微弱、分布电容电流影响大带来的故障辨识难题.最后,基于PSCAD/EMTDC仿真平台,建立柔性直流配电网模型,通过仿真分析验证所提出的电流差动保护方案的可行性和适用性.In view of the difficulty of fault identification caused by the influence of system mode of connection and line distributed capacitance in the direct current(DC)distribution network,this paper analyzes the applicability of traditional current differential protection in DC distribution network firstly.Then,the relationship between the fault point current and the differential current at both ends of the DC line is deduced by using the Bergeron model for the DC line.Furthermore,a current differential protection scheme with line distributed capacitance current compensation is proposed,which cannot only identify weak faults,but also automatically immune to the influence of distributed capacitance.Finally,based on PSCAD/EMTDC simulation platform,the flexible DC distribution network model is built to verify the feasibility of the current differential protection scheme proposed in this paper.

关 键 词：直流配电网 直流线路保护 线路贝瑞隆模型 电流差动保护 

分 类 号：TM77[电气工程—电力系统及自动化]