基于广域信息的同杆双回线测距及选相  

Fault Location and Phase Selection for Parallel Transmission Lines Based on Wide Area Measurement System

作　　者：王艳[1] 张艳霞[1] 徐松晓[2] 

机构地区：[1]天津大学电力系统仿真控制教育部重点实验室,天津市300072 [2]保定市电力公司,河北省保定市071000

出　　处：《电力系统自动化》2010年第6期65-69,74,共6页Automation of Electric Power Systems

摘　　要：将广域测量系统得到的输电线路两端电气量进行六序分解,利用六序分量中同正序故障分量的传输线长线方程测得故障距离,然后利用两端电气量和故障距离再借助长线方程求得故障点的各相电流,依据故障点相电流的幅值特征判断故障相。该方法原理清晰,选相逻辑简单可靠,且随着系统运行方式的变化可自适应调整选相判据的定值。理论分析和MATLAB仿真测试表明,所提出的方法测距精度高,选相不受故障点过渡电阻和线路分布电容电流的影响,可以为同杆双回线的距离保护提供有效的选相逻辑。实际故障数据分析证明该方法可靠、实用。This paper introduces the six sequence variables method to analyze the electrical signals gained from the end of transmission lines, and uses the same positive sequence signal＇s long line equation to locate the fault point. With the help of long line equation, the fault currents can be calculated form the location of fault and electrical signals gained from the end of transmission lines. Based on the magnitude characteristics of fault currents, a theory of fault phase selection is proposed. This principle is clear and reliable. It can automatically adjust the criterion of fault phase selection when the operation mode is changed. Theoretical analysis and MATLAB simulations show that this method has high fault locating accuracy and is not affected by distributed capacitance and transition resistance. It can provide effective fault phase selection logic for distance relay protection of parallel transmission lines. Analysis result of real fault data using this method shows that it is practical and reliable

关 键 词：同杆双回线 故障测距 故障选相 广域测量系统 六序分量 

分 类 号：TM755[电气工程—电力系统及自动化]