耦合双回线路电弧故障测距的新相模变换方法  

Locating Arc Faults on Coupling Two Parallel Transmission Lines Using the Novel Phase-model Transformation

作　　者：束洪春[1] 刘振松 彭仕欣[3] 

机构地区：[1]昆明理工大学电力工程学院,昆明650051 [2]云南电力研究院,昆明650051 [3]云南电网公司昆明供电局,昆明650051

出　　处：《高电压技术》2009年第3期480-486,共7页High Voltage Engineering

基　　金：国家自然科学基金(90610024;50467002;50347026;50847043);云南省科技攻关项目(2003GG10);云南省自然科学基金项目(2005F0005Z;2004E0020M;2002E0025M)~~

摘　　要：输电线路故障测距一直是经久不衰的研究课题。,根据三相系统和同塔双回线系统的阻抗矩阵关系,从能用单一模量反映所有普通三相系统故障的新相模变换矩阵出发,推导出适用于双回线的相模变换矩阵。提出了一种基于新模量变换的双回线故障定位时域算法,该算法利用某一故障模量电弧电压、电流的转移特性来构造测距算法。它具有如下特点:算法在时域中进行,所需的时间窗短,不需要滤波等环节;用最小二乘法来提高测距精度,且测距的精度不受过渡电阻、故障类型及对端系统阻抗变化的影响。大量的电磁暂态仿真结果表明,该算法具有很高的精度。According to the relationship between the impedance matrix of three-phase system and parallel transmission line system, a novel phase mode transform matrix of parallel transmission line system was deduced from the phase-mode transform matrix of three-phase system which could reflect all types of faults by single mode, and a novel algorithm was put forward which was based on phase-mode transform for locating faults on coupling parallel transmission lines. The algorithm is obtained by the transfer characteristics relationship of the are voltage and current at one mode. The proposed algorithm has following characteristics： it is a time-domain method, and uses the method of least squares to improve the accuracy; it is independent of source impedance. Electromagnetic transient simulation indicates that the presented algorithm maintains high accuracy for two parallel transmission lines.

关 键 词：六相系统 耦合双回线 电弧故障 最小二乘法 电磁暂态 故障测距 相模变换 

分 类 号：TM755[电气工程—电力系统及自动化]