高压直流线路单端暂态量保护研究  

Research on transient-based protection for HVDC lines

作　　者：张保会[1] 张嵩[1] 尤敏[1] 曹瑞峰[1] 

机构地区：[1]西安交通大学电气工程学院,陕西西安710049

出　　处：《电力系统保护与控制》2010年第15期18-23,共6页Power System Protection and Control

基　　金：国家自然科学基金项目(50977074)~~

摘　　要：针对国内已投运的高压直流线路主保护存在的问题,提出了仅采用单端暂态电压信号的直流线路保护方案。通过对直流线路两端安装的平波电抗器和直流滤波器组的幅频特性分析,构造了暂态量保护的主元件——边界元件的原理和算法,并在此基础上形成了启动元件、雷电干扰识别元件和故障极判别元件的动作判据以及它们与主元件间的逻辑配合关系。大量EMTDC仿真表明,该方案具有准确、快速、可靠地识别直流线路内外部故障,耐受过渡电阻能力强等特点,且保护整定一次性到位,不需要随着线路长短的变化而改变。In order to overcome the shortcomings of current main protection for HVDC lines,a novel protection scheme based on non-unit transient voltage is proposed.Through analyzing the characteristics of smoothing reactors and DC filters located at both ends of the DC line,the working principle and algorithm of the main element——boundary unit,as well as the operation criteria of starting unit,lightning identification unit and fault-pole identificaiton unit are established.Besides,the logic coordination of each element is also presented.Extensive EMTDC simulation experiments show that this protection scheme can accurately and reliably identify DC line faults,with excellent performance of tolerating transition resistances.Also,the relay threshold requires setting only once and needs no more modification as the length of line changes.

关 键 词：高压直流 线路保护 单端量 暂态量保护 故障极判别 雷电干扰识别 

分 类 号：TM773[电气工程—电力系统及自动化]