基于电流突变采样值轨迹特征的快速母线保护  

Bus Protection Based on Trajectory Characteristics of Current Sample Value Mutation

作　　者：王兴国 于溯 周泽昕 郭雅蓉 李勇 柳焕章 WANG Xingguo;YU Su;ZHOU Zexin;GUO Yarong;LI Yong;LIU Huanzhang(State Key Laboratory of Power Grid Safety(China Electric Power Research Institute),Haidian District,Beijing 100192,China;Central China Branch of State Grid Corporation of China,Wuhan 430077,Hubei Province,China)

机构地区：[1]电网安全全国重点实验室(中国电力科学研究院有限公司),北京市海淀区100192 [2]国家电网有限公司华中分部,湖北省武汉市430077

出　　处：《电网技术》2023年第4期1423-1431,共9页Power System Technology

摘　　要：新能源电源提供的短路电流幅值受限,故障特征弱化,影响母线故障的快速准确识别。该文利用三相电流同一采样值突变量快速提取电流突变特征,将母线各支路电流进行分组,分别构造了两种启动元件,根据启动元件的动作时序,快速识别母线区内、外部故障和区外转区内故障。建立了母线多支路分组电流突变量采样值的分析平面,经过极性转换与采样值积分,直观反映母线区内外故障时电流突变采样值的运动轨迹,在此基础上,建立了识别母线区内外故障的保护动作区。利用实时数字仿真平台(real time digital system,RTDS)建立仿真系统,仿真结果表明,母线故障时,启动元件动作时间小于1ms,利用电流突变采样值轨迹可以快速识别区内外故障及转换性故障。The limited amplitude of the short-circuit current provided by the new energy power supply and the weakened fault characteristics affect the rapid and accurate identification of the bus faults.In this paper,the three phase current with the same sample value of the mutation is used to quickly extract the current mutation characteristics.The branch currents of the bus are divided into groups,and two kinds of starting elements are constructed respectively.According to the action sequence of the starting elements,the quick identifications of the faults in the bus area,the faults outside the area and the faults transferred from the outside area to the inside are achieved.The analysis plane of the multi-branch grouping current mutation sampling value of the bus is established.After the polarity conversion and the sampling value integration,the movement track of the current mutation sampling value in and out of the bus area is directly reflected.On this basis,the protection action area for identifying faults in and out of the bus area is established.The Real Time Digital System(RTDS)is used to establish the simulation system.The simulation results show that the starting element action time is less than 1ms when the bus fault occurs,and the current mutation sampling value trajectory can be used to quickly identify the faults inside and outside the zone and the transformational faults.

关 键 词：母线保护 电流采样值突变量 启动元件 区内外故障 电流采样值轨迹 

分 类 号：TM721[电气工程—电力系统及自动化]