以杆塔直线距离为基准的双端输电线路非同步故障测距算法  

Fault Location Algorithm Using Asynchronous Data for Two-terminal Transmission Line Based on Straight Line Distance Between the Towers

作　　者：陈旭 张鑫瑞 伍祥 张超 张利花 王涛 CHEN Xu;ZHANG Xinrui;WU Xiang;ZHANG Chao;ZHANG Lihua;WANG Tao(State Grid Ningxia Marketing Service Center(State Grid Ningxia Metrology Center),Yinchuan 750001,Ningxia Hui Autonomous Region,China)

机构地区：[1]国网宁夏电力有限公司营销服务中心(国网宁夏电力有限公司计量中心),宁夏回族自治区银川市750001

出　　处：《电网技术》2021年第4期1581-1587,共7页Power System Technology

摘　　要：针对目前传统双端非同步故障测距算法存在伪根、程序实现复杂、受线路长度变化影响等缺点,提出一种以杆塔直线距离为基准的双端非同步故障测距算法。该算法基于分布参数模型,利用测量点的电压、电流消去不同步角度,求解出线路长度放大倍数,推导出以杆塔直线距离为基准的故障距离。该算法仅利用解析表达式即可求出故障距离,不存在伪根,无需判别故障类型,且不受线路长度变化的影响,程序简单、容易实现,能有效克服传统方法存在的缺点。原理推导和ATP-EMTP仿真结果表明,算法基本不受线路长度变化、不同步角度、过渡电阻、负荷电流等因素的影响,且测距精度高。For the problems existing in current algorithms of asynchronized two-terminal fault location such as false root, complex proceeding, affected by the change of line length and so on, a two-terminal fault location algorithm using asynchronous data based on straight line distance between the towers is proposed. The new algorithm eliminates the unsynchronized angle by voltage and current at the measuring point, obtains the magnification of the line length, and derives the fault distance based on the straight line distance between the towers. This algorithm has following advantages: it can calculate the fault distance only by the analytic expression;it has no false root;it needs not identify the fault type;and it is not affected by the change of line length. Besides, it has a simple operating procedure and it can effectively overcome the deficiency of the traditional method. The principle derivation and the simulation result of ATP-EMTP show that the algorithm can eliminate basically the influences of the line length change, the unsynchronized angle, the transition resistance, the load current and other factors. In addition, this fault location algorithm has a high accuracy.

关 键 词：双端非同步 故障测距 分布参数 杆塔直线距离 线路长度变化 伪根 

分 类 号：TM721[电气工程—电力系统及自动化]