同杆双回输电线路的固有频率测距算法  

Natural Frequencies Based Fault Location Algorithm for Parallel Transmission Lines on the Same Tower

作　　者：李小鹏[1] 何正友[1] 夏璐璐[1] 

机构地区：[1]西南交通大学电气工程学院,四川省成都市610031

出　　处：《电力系统自动化》2011年第12期47-51,共5页Automation of Electric Power Systems

基　　金：国家自然科学基金资助项目(50877068);高等学校博士学科点专项科研基金资助项目(200806130004)~~

摘　　要：提出一种基于行波固有频率的同杆双回线路单端故障测距方法。针对不同的故障类型,通过推导故障点反射系数矩阵,判断模混杂情况,选择恰当的模量,对其进行频谱估计,并提取固有频率主成分。利用故障距离、固有频率和边界条件三者的数学关系求取测距结果。考虑到双回线路不能忽略分布电容对测距结果的影响和该测距算法的特点,采用对频率敏感的频率相关分布参数线路模型,在PSCAD/EMTDC平台上建立仿真系统进行仿真研究。不同故障条件下的仿真结果表明,所提出的方法具有良好的测距精度和适应性。A single-ended fault location method based on traveling wave natural frequencies for parallel lines on the same tower is proposed.The modal mixing phenomenon is judged by deriving the reflection coefficient matrix for different fault types.Then the appropriate modal is selected to estimate the traveling wave spectra and extract the dominant frequency.Finally,the location results can be derived from the relationship among fault distance,the natural frequencies and boundary conditions.Considering the influence of distributed capacitance on location results and the characteristic of the proposed algorithm,the frequency sensitive distributed parameter line model is used to establish the simulation system with PSCAD/EMTDC for simulation research.The simulation results under different fault conditions indicate that the proposed method has good accuracy and applicability.

关 键 词：同杆双回线路 单端测距 固有频率 反射系数矩阵 

分 类 号：TM855[电气工程—高电压与绝缘技术]