特高压带高压并联电抗器线路的行波差动保护研究  

Study on Traveling-wave Differential Protection on UHV Transmission Line with High Voltage Shunt Reactor

作　　者：蒋小平[1] 张红菊[1] 马速良[1] 曹贯强[1] 

机构地区：[1]中国矿业大学机电与信息工程学院,北京100083

出　　处：《高压电器》2016年第2期121-127,共7页High Voltage Apparatus

基　　金：中央高校基本科研业务费专项资金项目资助(00-800015G2)~~

摘　　要：传统的电流差动保护无法应用于带高压并联电抗器的特高压交流输电线路,为此提出了一种新的行波差动保护方法。首先计算三相电压、三相电流暂态量,经过相模解耦变换,若得到行波电流模分量,则判断系统发生故障;然后以线路两端初始方向电流行波波头开始数十微秒内的积分作为特征值构成新的保护动作判据,以判别是区内故障还是区外故障。该判据能够有效地躲过系统正常运行和区外故障引起的暂态不平衡差流,同时对区内各种故障都有很高的灵敏度。理论及MATLAB仿真计算表明:该方法动作可靠,速度快,对采样频率、通信系统及计算机技术没有过高的要求,能够在现有的技术条件下实现,具有较高的实用价值。The traditional current differential protection cannot be applied to UHV AC transmission line with high voltage shunt reactor, so this paper describes a novel solution of traveling-wave differential protection. Firstly the three-phase voltage and current transients are calculated, it means that system fault if the module components of traveling-wave current are obtained after decoupling transformation. In order to distinguish the internal faults or external faults, the integral value of initial wave fronts at both terminals for tens milliseconds is taken as eigenvalues which compose the novel action criterion. This criterion can avoid transient unbalance differential currents under the system normal operation and external faults. It also has high sensitivity for all internal faults.Theoretical analysis and MATLAB simulation show that the solution operates reliably and rapidly. The protection has high practical value and low demands for sampling rate, communication system and computer technology. It could be realized by existing technique.

关 键 词：电力系统 线路保护 行波差动保护 特高压交流输电 高压并联电抗器 相模变换 

分 类 号：TM774[电气工程—电力系统及自动化]