摘要
电容式电压互感器不能有效传变宽频带的电压故障行波信号,使得传统利用电压故障行波构成行波方向继电器的保护算法不能应用于实际电力系统保护中,为此提出了一种极化电流行波方向继电器。该方向继电器以电压故障行波中工频分量初始极性与电流故障初始行波的波头极性相比较判定故障方向,解决了传统行波方向继电器因不能有效获取宽频带电压故障行波而无法应用于实际电力系统保护的问题。文中给出了极化电流行波方向继电器的基本原理及保护算法,并用电磁暂态仿真软件ATP(alternative transient program)进行了大量的仿真。仿真结果表明,新的方向继电器动作速度快,不受故障类型、故障距离、过渡电阻和电流互感器饱和的影响,具有良好的动作特性。
Capacitor voltage transformer cannot transmit wide frequency band voltage fault travelling-waves effectively,so that traditional voltage fault travelling-wave based directional relay cannot be applied to power system protections.Then a polarized current travelling-wave based directional relay（PCTDR） for transmission lines is put forward.This directional relay judges the fault direction by comparing the initial polarity of fundamental frequency components in voltage fault transient travelling-waves with the wave front polarity of current fault initial travelling-wave.This method resolves the problems that the traditional travelling-wave directional relay cannot be utilized in power system because capacitor voltage transformer cannot transmit wide frequency band voltage travelling-waves effectively.The basic principle and protection algorithm of PCTDR are presented.Simulation model of a 750 kV transmission system has been constructed with alternative transient program（ATP）.Simulation results verify that PCTDR has good operation performance because it has fast operation speed and is immune to fault types,fault distance,fault path resistance and current transformer saturation. This work is supported by the National Natural Science Foundation of China（No.50937003,No.51007045）,the Foundation of State Key Lab of Power Systems of China（No.SKLD09M04）,National Key Technology Research and Development Program of China（No.2006BAJ16B02）,and Specialized Research Fund for the Doctoral Program of Higher Education of China（No.200800031034）.
出处
《电力系统自动化》
EI
CSCD
北大核心
2011年第21期78-83,100,共7页
Automation of Electric Power Systems
基金
国家自然科学基金重点项目(50937003)
国家自然科学基金资助项目(51007045)
电力系统国家重点实验室重点基金资助项目(SKLD09M04)
国家科技支撑计划资助项目(2006BAJ16B02)
高等学校博士学科点专项科研基金资助项目(200800031034)~~
关键词
故障行波
方向继电器
工频分量
小波变换
行波保护
fault travelling-wave
directional relay
fundamental frequency component
wavelet transform
travelling-wave based protection
