高压直流输电控制与保护对线路故障的动态响应特性分析  

Analysis on the Dynamic Performance Characteristics of HVDC Control and Protections for the HVDC Line Faults

作　　者：李爱民[1] 蔡泽祥[1] 任达勇[2] 李晓华[1] 

机构地区：[1]华南理工大学电力学院,广东省广州市510640 [2]中国南方电网超高压输电公司天生桥局,贵州省兴义市562400

出　　处：《电力系统自动化》2009年第11期72-75,93,共5页Automation of Electric Power Systems

基　　金：国家自然科学基金资助项目(50807017)~~

摘　　要：直流输电线路保护中,以电压变化率为动作判据的线路行波保护和低电压保护难以检测出线路高阻接地故障,线路差动保护需要通过闭锁躲避区外故障而使动作延时较长,从而难以起到后备作用。同时,直流控制系统环节对线路保护的动作特性也有很大的影响,小负荷水平下将导致线路电流波动而导致差动保护拒动。结合某一直流线路实际参数,基于真实的直流控制保护模型与参数的EMTDC仿真平台,采用实际故障录波分析和仿真分析相结合的手段,系统分析了线路保护不正确动作的机理以及直流系统控制环节对线路保护的影响,并提出了解决方案。The traveling wave protection and under-voltage protection which are initiated by the voltage derivative can not detect the high impedance fault, and the long operation time of differential protection required to avoid external faults makes it hard to be the back-up protection. Furthermore, the HVDC control system has a great influence on the performance of the DC line protection, especially at the low load level. The differential protection will fail to action due to the current fluctuation caused by the control system. Based on the actual HVDC line parameters and the EMTDC simulation platform, the current DC line protection and the influence of the control system is evaluated, in connection with the fault records and the simulation results. An improvement scheme is proposed.

关 键 词：直流线路保护 直流控制 直流线路故障 动态响应特性 

分 类 号：TM773[电气工程—电力系统及自动化]