考虑短线路折反射的配电网故障定位研究  

Study on fault location considering refraction and reflection of short lines in a distribution network

作　　者：戴锋 王政 程孟晗 杨海铭 梁睿 DAI Feng;WANG Zheng;CHENG Menghan;YANG Haiming;LIANG Rui(State Grid Jiangsu Electric Power Company Maintenance Branch,Nanjing 210000,China;Zibo Power Supply Company,State Grid Shandong Electric Power Company,Zibo 255032,China;School of Electrical and Power Engineering,China University of Mining and Technology,Xuzhou 221116,China;Jiangsu Province Laboratory of Electrical and Automation Engineering for Coal Mining,Xuzhou 221116,China)

机构地区：[1]国网江苏省电力有限公司检修分公司,江苏南京210000 [2]国网山东省电力公司淄博供电公司,山东淄博255032 [3]中国矿业大学电气与动力工程学院,江苏徐州221116 [4]江苏省煤炭电气与自动化工程实验室,江苏徐州221116

出　　处：《电力系统保护与控制》2020年第16期122-130,共9页Power System Protection and Control

基　　金：国家电网公司科技项目资助(J2018078);国网江苏省电力有限公司科技项目资助(J2018036);国网江苏省电力有限公司科技项目资助(J2019117)。

摘　　要：为了解决连接有短线路的配电网故障测距难题,提出一种考虑短线路折反射规律的故障定位方法。首先在每条线路的首端提取故障电压初始行波及故障电流初始行波,根据电压和电流行波极性是否相同判断故障线路。同时根据故障线路两端测得的模量时间差大小判断故障发生在线路的前半部分还是后半部分。最终依据故障线路的中点处线模电压行波波头的前两个到达时刻,进行故障的精确定位。利用PSCAD/EMTDC搭建连接有短线路的10 kV配电网模型,进行不同故障情况仿真验证。结果表明:所提方案能够准确定位故障点,不需要进行时间准确同步,不受故障距离、故障电阻及故障初相角等因素的影响,具有良好的经济性与工程实用性。To solve the problem of fault location in a distribution network connected with short lines,a fault location method considering refraction and reflection of short lines is proposed.First,the initial fault voltage and current traveling wave are extracted at the head of each line and the fault line can be estimated by the polarity of voltage and current traveling wave.Then the modulus time difference detected at both ends of the fault line can be used to identify whether the fault occurs at the first or the second half of the line.Finally,the accurate location of the fault can be calculated on the basis of the first two arrival times of the aerial-mode voltage traveling wave.A 10 kV contribution network connected with short lines is built in PSCAD/EMTDC and various fault simulations are conducted.The results show that the proposed scheme can locate the fault with high accuracy and doesn’t require accurate synchronization.In addition,the scheme is not affected by fault distance,resistance or inception angle.This demonstrates high economic efficiency and engineering practicability.

关 键 词：故障定位 配电网 行波 短线路 分布式测量 

分 类 号：TM73[电气工程—电力系统及自动化]