摘要
针对目前行波测距法波头检测算法存在的缺陷,提出了一种基于零空间追踪算法的混合三端直流输电线路故障测距方法。首先,用能改善模态混叠的零空间追踪算法对故障信号进行分解,再与Teager能量算子结合标定行波波头,获取行波到达测量点的时刻;其次,利用两端行波到达的时间差判断故障分支。最后,依据行波测距的机理,提出一种不受波速影响的故障测距法。仿真结果表明,该方法具有较高的准确度,基本不受故障位置、过渡电阻和故障类型等因素的影响。
In view of the shortcomings of the current wave-head detection algorithm of traveling wave location methods,a fault location method for hybrid three-terminal DC transmission lines based on the null space pursuit algorithm is proposed.First,the null space pursuit algorithm that can deal with modal aliasing is used to decompose the fault signal,and then the traveling wave head is calibrated in combination with the Teager energy operator to obtain the time when the traveling wave reaches the measurement point.Second,the fault branch is judged by the time difference between the arrival of the traveling wave at both ends.Finally,a fault location method that is not affected by wave speed is proposed.The simulation results show that the proposed method has high accuracy and is not affected by the fault location,fault resistance,fault type and other factors.
作者
戴志辉
邱晓璇
DAI Zhihui;QIU Xiaoxuan(School of Electrical and Electronic Engineering,North China Electric Power University,Baoding 071003,China)
出处
《电气应用》
2023年第10期27-34,共8页
Electrotechnical Application
基金
国家自然科学基金重点资助项目(51877084)。
关键词
故障测距
行波法
直流输电线路
瞬时能量
零空间追踪
fault location
traveling wave method
DC transmission lines
instantaneous energy
null space pursuit
