高压直流输电线路边界高频电压信号衰减特性分析.pdf

第41卷第16期
电力系係护影控制
Vol41 No 16
2013年8月16日
Power System Protection and Control
Aug.16,2013
高压直流输电线路边界高频电压信号衰减特性分析
孔飞,张保会,甄威2,张爱玲
(1.西安交通大学电气工程学院,映西西安71049;2.四川电力科学研究院,四川成都610072
3.许继集团有限公司,河南许昌461000)
摘要:高压直流输电线路两端安装的直流滤波器和平波电抗器形成了高频电压信号的线路边界,利用这种边界特性可以构成
新型线路保护,但线路边界参数及配置方式的差异会对线路边界高频电压信号瘕减程度造成影响。基于现有直流输电工程的
直流漶波器与平波电抗器的数及配置原则,研究了不同直流滤波器结构、不同平波电抗器配置方式以及直流滤波器与平波
电抗器元器件不同参数对直流输电线路边界高频电压信号衰减特性的影响。結果表明,不同参数及配置形式的缄路边界对高
顿电压信号均有较大瘕减,可以依据高频电压信号在区内外故障时的差异构成新型直流输电线路保护。
关键词:缄路边界;平波电抗器;直流波器;高频电压信号;衰减特性
Analysis on high frequency voltage signal attenuation characteristic of H DC transmission line boundary
KONG Fei, ZHANG Bao-hui, ZHEN Wei,, ZHANG Ai-ling
(1. School of Electrical Engineering, Xi an Jiaotong Universit Xi an 710049, China Sichuan Electric Power Research Institute
Chengdu 610072, China; 3. Xd Group Corporation, Xuchang 461000, China)
Abstract: The line boundary of high frequency voltage signal is composed of DC filter and smoothing reactor installed at both ends
of HVDC transmission line, which can be used to propose new principle based protections. However, the differences of component
parameter and allocation principle affect the high frequency voltage signal attenuation of the line boundary. Thus, analysis of the
at enuation characteristic is presented. Based on the present HVD project component parameter and allocation principle of DC filter
and smoothing reactor this paper studies the high frequency ol ae sial attenuation characteristic of HVDC transmission line with
diferent D filter structures, diferent arrangements of smoothing reactor, and different component parameters. The results show that
HVDC line boundaries with different component parameters and allocation principle cause large attenuation of high frequency
oltage signal, and the difference of high frequency oltage signal when internal fault and extemal fault occur can be used to form the
novel HVDC line protections
This work is supported by National Natural Science Foundation of China(No. 50977074 )and Science and Technology Project
of SGCC
Key words: line boundary; smoothing reactor; DC filter; high voltage frequency signal; attenuation characteristic
中图分类号:TM71文献标识码;A
文章编号:1674-3415(2013)16-0085-06
0引言
谐波分量的。从直流滤波器及平波电抗器的作用不
难得知,它们均是直流输电工程不可或缺的重要设
直流滤波器并联装设在直流高压母线和中性母备之一,且对高频电压信号有一定的衰减特性。
线之间,它用来保证换流器在任何方式下,最大等
由于现有直流线路保护在实际运行中存在种种
效谐波电流不超过其限定值?。平波电抗器则与直弊端,例如易受雷电、换相失败、交流侧故障等暂
流滤波器一起构成换流站直流侧的谐波潓波回路,态现象下扰,并且在线路高阻抗接地时也存在灵敏
抑制直流线路电流和电压脉动成分,降低直流侧的度不够的情况,因此近年来国内外学者着力于研究
利用直流滤波器与平波电抗器对高频电压信号衰减
基金项目:国家自然科学基金项目(50977074);国家电网科特性构成的新型线路保护41?,其基本原理为:当
技项目
线路区外故障时,由于线路边界的衰减作用,线路