摘要
针对输电线路故障定位问题,提出一种双端非同步数据精确线搜索比相的故障定位新方法。首先,研究故障相电压电流沿线路分布情况,推导出故障电流分布系数的计算方法,分析故障相电压幅值相位单调性变化规律。然后,采用对称分量法处理故障前后线路两端的数据,计算出非同步相角差和故障电流分布系数。最后,利用线路电压序分量和电流序分量相位关系,采用全局精确线搜索法进行定位。EMTDC/PSCAD仿真数据的计算结果表明,该方法具有较高的定位精度,且不受故障类型、过渡电阻等因素的影响。
In allusion to problem of fault location in transmission lines, a novel fault location algorithm adopting two-terminal asynchronous data and based on accurate line-searching and phase-comparing is put forward. Firstly, by studying distribution of fault phase voltage and current along lines, calculation method of fault current distribution coefficient is deduced, and monotonic change principles of amplitude and phase of fault phase voltage are analyzed. Then, non-synchronous phase angle difference and fault current distribution coefficient are calculated with symmetrical component analysis to process the two terminals＇ data before and after the fault. Finally, on basis of phase relations between voltage and current sequence component on the fault line, fault location is carried on using global accurate line-searching method. Results of EMTDC/PSCAD simulation show that this method has higher fault location accuracy, and is immune to fault type, fault resistance and other factors.
出处
《电网技术》
EI
CSCD
北大核心
2015年第10期2972-2978,共7页
Power System Technology
基金
国家自然科学基金项目(510504253)~~
关键词
故障定位
电流分布系数
双端非同步
搜索比相
fault location
current distribution coefficient
two-terminal asynchronism
searching and phase-comparing
