以UPFC为边界的新型线路距离保护方法  

Novel Line Distance Protection Method with UPFC as Line Boundary

作　　者：董政鑫 李斌[1] 胡泽鹏 郑玉平 吴通华 孙天甲 DONG Zhengxin;LI Bin;HU Zepeng;ZHENG Yuping;WU Tonghua;SUN Tianjia(Key Laboratory of Smart Grid of Ministry of Education(Tianjin University),Tianjin 300072,China;Binhai Power Supply Company,State Grid Tianjin Electric Power Company,Tianjin 300450,China;NARI Group Corporation(State Grid Electric Power Research Institute),Nanjing 211106,China;State Grid Shanghai Municipal Electric Power Company,Shanghai 200122,China)

机构地区：[1]智能电网教育部重点实验室(天津大学),天津300072 [2]国网天津市电力公司滨海供电分公司,天津300450 [3]南瑞集团有限公司(国网电力科学研究院有限公司),南京211106 [4]国网上海市电力公司,上海200122

出　　处：《电力系统及其自动化学报》2023年第9期10-19,共10页Proceedings of the CSU-EPSA

基　　金：国家电网有限公司科技项目(5108-202218280A-2-66-XG,不受新能源出力特性影响的输电线路保护新原理研究)。

摘　　要：统一潮流控制器接入线路后使线路阻抗均匀性发生变化,传统距离保护动作性能受到影响。本文基于输电线路阻感模型提出一种以UPFC为线路边界的线路时域距离保护方法。利用保护安装处的时域电气量建立阻感模型微分方程组,使用最小二乘法对微分方程组求解,建立保护安装处电压实际值与计算值之间的拟合误差,通过计算得到的故障距离和拟合误差判断统一潮流控制器接入位置与故障点之间的关系。在PSCAD/EMTDC上进行仿真验证,实现以UPFC为边界的线路区内外故障判定。After a unified power flow controller(UPFC)is connected to the transmission line,the impedance uniformi⁃ty of the transmission line will change,and the performance of the traditional distance protection will be affected.In this paper,based on the transmission line resistance-inductance model,a line time-domain distance protection method with UPFC as the line boundary is proposed.The differential equations of the resistance-inductance model are established by using the time-domain electrical quantities at the protection installation,which are further solved using the least squares method.The fitting error between the actual and calculated values of voltage at the protection installation is ob⁃tained,and the relationship between the UPFC access location and the fault point is judged through the calculated fault distance and the fitting error.Simulation verification is performed on PSCAD/EMTDC,and the fault judgment inside and outside the line area is realized with UPFC as the line boundary.

关 键 词：统一潮流控制器 距离保护 线路阻感模型 单端量保护 

分 类 号：TM773[电气工程—电力系统及自动化]