基于最优FIR滤波器与层次聚类的配电网单相接地故障选线方法

发布时间：2018-06-01 21:24

本文选题：小电流接地系统 + 单相接地故障　；参考：《电网技术》2015年01期

【摘要】：由于故障特征不明显、噪声干扰、配电网不平衡运行状况影响等问题,现有小电流接地系统单相接地故障选线方法在可靠性与普适性方面仍存在不足。提出一种小电流接地系统单相接地故障选线方法,该方法依据故障暂态量的频率特性,通过最优FIR滤波器滤除干扰因素,提取有效故障特征,并利用层次聚类法,基于滤波后波形,检出变化趋势不同于其他线路的单根馈线,即为故障线路。仿真实验表明,较之于常用的小波算法,该方法避免了对数据的大量逐层分解,在各种故障状况下均可可靠检出故障线路,且降低了采样频率需求,节约系统资源,易于工程实现。
[Abstract]:Due to some problems such as unobvious fault characteristics, noise interference and unbalanced operation condition of distribution network, the existing single-phase grounding fault line selection methods for small current grounding systems are still insufficient in terms of reliability and universality. A fault line selection method for single-phase grounding fault in small current grounding system is proposed. According to the frequency characteristics of fault transient, the interference factors are filtered out by the optimal FIR filter, and the effective fault features are extracted, and the hierarchical clustering method is used. Based on the filtered waveform, a fault line is found, which is different from the single feeder of other lines. The simulation results show that compared with the conventional wavelet algorithm, this method avoids a large number of decomposition of data layer by layer, detects fault lines reliably under various fault conditions, reduces the need for sampling frequency, and saves system resources. Easy to implement in engineering.
【作者单位】：中国电力科学研究院;
【基金】：国家自然科学基金资助项目(51177152) 国家电网公司科技项目(2012-094)~~
【分类号】：TM862

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