基于暂态零序电流频谱灰关联分析的谐振接地系统故障选线方法

发布时间：2018-03-01 09:40

本文关键词： 谐振接地故障选线暂态零序电流灰色关联分析　出处：《电力科学与技术学报》2017年03期 　论文类型：期刊论文

【摘要】：为提高谐振接地系统单相接地故障选线的准确性和可靠性,提出一种充分利用故障暂态特征的故障选线方法。首先,通过对故障后暂态零序电流特征进行分析,利用快速傅里叶变换(FFT)对各线路暂态零序电流进行频率分解,保留特征频段内的成分,得到各线路暂态零序电流频率-幅值曲线图;然后,根据故障线路和非故障线路在特征频段内曲线的相似度较低,而非故障线路曲线相似度高,通过灰色关联分析求取各曲线间的绝对关联度,利用绝对关联度定义选线判定系数,通过比较各线路判定系数与设定阈值的大小进行选线。EMTP/ATP和MATLAB仿真结果表明:该方法不受故障线路类型、接地电阻、故障合闸角等因素的影响,同时能有效识别母线故障,具有很高的选线准确性和可靠性。
[Abstract]:In order to improve the single phase grounding fault line selection accuracy and reliability, this paper presents a fault to make full use of the fault transient line selection method. Firstly, through the analysis of transient zero sequence current fault features, using the fast Fu Liye transform (FFT) on the line of zero sequence transient current frequency decomposition, feature the frequency range of components, each line of transient zero sequence current frequency amplitude curve; then, according to the similarity between the fault line and the non fault line in the low frequency band characteristic curve, and the non fault line curve similarity degree is high, through the gray correlation analysis to calculate the curve between the absolute correlation degree, the definition of line selection decision the absolute correlation coefficient, line selection.EMTP/ATP and MATLAB simulation results show that the coefficient of determination by comparing each line with the threshold set size: this method is not affected by the fault line type, ground The influence of factors such as resistance, fault closing angle and other factors can be used to identify busbar faults effectively, and it has high accuracy and reliability of line selection.

【作者单位】：国家电网重庆市电力公司万州供电分公司;长沙理工大学湖南省电动交通与智能配网工程技术研究中心;国家电网威海供电公司;国家电网娄底供电公司;
【基金】：国家留学基金(201308430317) 湖南省自然科学基金(2015JJ4001;13JJ6044)
【分类号】：TM862

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