摘要
串联电容及其非线性保护装置给串联补偿线路的故障测距带来了困难。在考虑串联电容及其保护装置对频率提取及边界条件影响的基础上,研究了基于行波固有频率的串补输电线路故障测距算法。该算法首先利用单端电流频率信息判断故障发生在串联电容前或串联电容后,对于发生在串联电容后的故障,需要考虑串联电容处的折反射对测距算法的影响,然后依据故障距离与固有频率、边界条件间的数学关系进行精确测距。大量仿真结果表明该算法不受故障距离、故障类型和过渡电阻的影响,具有良好的测距精度和适应性。
Series capacitor and its nonlinear protection bring troubles to fault location of transmission line with series compensator. Considering the influence of series capacitor and its protection device on frequency extraction and boundary conditions, based on natural frequencies of travelling wave a fault location algorithm for transmission line with series compensator was researched. Firstly, by use of frequency information of single terminal current it was judged that the fault occurred in the front of or behind the series capacitor; for the fault occurred behind the series capacitor it was necessary to consider the influences of refraction and reflection of travelling wave at series capacitor on fault location algorithm, then precise fault location was performed according to mathematical relation among fault distance, natural frequencies of travelling wave and boundary conditions. A lot of simulation results showed that the proposed algorithm was independent of fault distance, fault types and transition resistance, and possessed satisfied fault location accuracy and adaptability.
出处
《电网技术》
EI
CSCD
北大核心
2012年第6期71-76,共6页
Power System Technology
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)
中央高校基本科研业务费专项资金资助(SWJTU11ZT07)~~
关键词
串补线路
氧化锌非线性电阻
固有频率
故障测距
series compensated line
metal oxide varistor
natural frequency
fault location
