直流输电线路行波测距的误差机理及改进策略  

Mechanism and Improvement of Errors in Traveling Wave Fault Location of DC Transmission Lines

作　　者：徐敏[1] 蔡泽祥[1] 刘永浩[1] 库晓斐[1] 

机构地区：[1]华南理工大学电力学院,广东广州510640

出　　处：《广东电力》2012年第2期40-45,66,共7页Guangdong Electric Power

基　　金：国家自然科学基金资助项目(51077055);高等学校博士学科点专项科研基金资助项目(20100172110031)

摘　　要：针对目前直流输电线路行波测距精确度较低的问题,对测距误差的产生机理和典型的直流行波测距原理进行分析,指出波头到达时间的标定和行波波速的选取是影响直流行波测距精确度的两个关键因素;通过行波测距的误差计算公式的推导,明确了波头到达时间的标定误差和行波波速选取误差对测距精度的影响规律。以天广直流线路工程为例,分别探讨了波头到达时间的标定和波速选取中存在的问题,并提出了相应的改进策略,仿真结果验证了分析结论和改进策略的有效性。In view of low accuracy of traveling wave fault location of DC transmission lines, the paper analyzes error mecha- nism and typical principle of traveling wave fault location. It is pointed out that arrival time definition of wave front and wave speed of traveling wave are two key factors influencing accuracy of traveling wave fault location. By deduction of for- mula for calculating errors in traveling wave fault location, influencing regulation of arrival time definition of wave front and selection error of traveling wave speed on fault location accuracy is made clear. Tian-Guang DC line project is taken as an example, and problems in definition of arrival time of wave front and wave speed selection are discussed; relevant im- provements are proposed and the simulation result verifies effectiveness of the analyzed conclusion and improvements.

关 键 词：直流输电 行波测距 测距误差 改进策略 

分 类 号：TM726[电气工程—电力系统及自动化]