配电线路自适应相序识别方法  

Adaptive phase sequence identification method for distribution lines

作　　者：陈恒 王鹏玮 徐丙垠[2] 薛永端[3] 孙中玉 CHEN Heng;WANG Pengwei;XU Bingyin;XUE Yongduan;SUN Zhongyu(Shandong Kehui Electric Power Automation Co.,Ltd.,Zibo 255000,China;School of Electrical and Electronic Engineering,Shandong University of Technology,Zibo 255000,China;College of New Energy,China University of Petroleum(East China),Qingdao 266580,China)

机构地区：[1]山东科汇电力自动化股份有限公司,山东淄博255000 [2]山东理工大学电气与电子工程学院,山东淄博255000 [3]中国石油大学(华东)新能源学院,山东青岛266580

出　　处：《电力系统保护与控制》2022年第6期53-64,共12页Power System Protection and Control

基　　金：国家自然科学基金项目资助(52077221)。

摘　　要：配电网故障测距主要依靠双端行波法和双端阻抗法,线路换相会造成故障点两侧终端采集的电压电流相序不对应,导致测距结果不可信,因此迫切需要自适应相序识别方法来解决双端电气量不对应的问题。在配电终端同步采样的前提下,利用沿线分布负荷对系统电压电流影响较小的特性,分析了两种换相方式的不同换相次数对于相邻配电终端采集电气量与故障信息产生的变化,提出了一种自适应相序识别方法。该方法通过计算相邻配电终端采集电气量的相似系数与相角差,统计同一次故障的动作或告警信息对应关系,判断其保护区内线路以何种方式换相以及换相次数,实现相序识别。通过判断配电终端采集电气量的相位超前关系,实现互感器反接的自动识别,无需外加装置或人工配置。仿真结果表明,该方法可有效识别任意相邻终端之间电压电流相序关系,具有较高的准确性,为双端测距法的工程应用提供了保障。Distribution network fault location mainly depends on the dual-end traveling wave and dual-end impedance methods.Line commutation may cause the voltage and current phase sequence collected by the terminals on both sides of the fault point to not correspond to each other.This leads to untrustworthy results in distance measurement.Therefore,an adaptive phase sequence identification method is urgently needed to solve the problem of dual-end electrical quantity mismatch.Given synchronous sampling of distribution terminals,and using the characteristic that distributed load along the line has little influence on system voltage and current,the changes of collection of electrical quantity and fault information by adjacent distribution terminals caused by different commutation times of two commutation modes are analyzed.An adaptive phase sequence identification method is presented.This method calculates the similarity coefficient of collection electrical quantity by adjacent distribution terminals and phase angle difference,and records the corresponding relation of action or alarm information of the same fault.It also judges how and how many times the lines in the protection area commutate,and realizes phase sequence recognition.By judging the phase advance relationship of electric quantity collected by the distribution terminal,automatic identification of mutual inductor reverse connection can be achieved without additional devices or manual configuration.The simulation results show that this method can effectively identify the voltage and current phase sequence relationship between arbitary adjacent terminals with high accuracy.This provides a guarantee for the application of the double-ended ranging method in engineering.

关 键 词：配电线路 双端测距 自适应方法 线路换相 相序识别 

分 类 号：TM75[电气工程—电力系统及自动化]