一种基于特征根的配电网单端故障测距的新方法A New Method of Single Terminal Fault Location for Distribution Network Based on Eigenvalue
唐昆明;唐辰旭;罗建;
摘要(Abstract):
在零序电压、电流中,暂态分量的衰减时间常数及频率与故障距离相关,其值可由象函数特征方程的根表示。分析了该函数与故障距离的关系,提出了一种基于特征根的单端测距方法。该方法结合拉氏变换与双曲函数线路模型,由零序电压、电流象函数的特征方程,得到了象函数测距方程,同时,利用特征频段(SFB)的性质,提出了该测距方程在SFB内的等效形式,通过Prony算法,从采样信息中提取SFB内的特征根,采用搜索法求解超越方程,实现了故障测距。该单端测距方法可准确得到故障距离的解析表达式,且克服了传统双曲函数模型不能用于暂态计算的问题。大量的EMTP仿真实验结果验证了该方法的正确性,不受过渡电阻、故障初始角、中性点运行方式的影响,能够满足实际工程需求。
关键词(KeyWords): 单相接地;暂态特征;特征频段;拉氏变换;特征根;单端测距
基金项目(Foundation):
作者(Author): 唐昆明;唐辰旭;罗建;
Email:
DOI: 10.13335/j.1000-3673.pst.2014.03.033
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