A Line Selection Method for Single-phase High-impedance Grounding Fault in Resonant Grounding System of Distribution Network Based on Improved Euclidean-dynamic Time Warping Distance

被引：0
|
作者：
Zhuang S. [1 ]
Miao X. [1 ]
Jiang H. [1 ]
Guo M. [1 ]
机构：
[1] College of Electrical Engineering and Automation, Fuzhou University, Fuzhou, 350116, Fujian Province
来源：
Dianwang Jishu/Power System Technology | 2020年 / 44卷 / 01期
基金：
中国国家自然科学基金;
关键词：
Fuzzy C-means clustering; Improved Euclidean-dynamic time warping distance; Resonance-grounding system; Single-phase HIF; Waveform pretreatment;
D O I：
10.13335/j.1000-3673.pst.2018.3037
中图分类号：
学科分类号：
摘要：
For the single-phase high-impedance ground fault (HIF) in resonant grounding system, single characteristic quantity fault information is not obvious, and there is a significant difference in transient zero-sequence currents between fault line and non-fault line. A new method of single-phase HIF line selection based on improved Euclidean-dynamic time warping (E-DTW) distance is proposed. Firstly, the similarity matrix of the transient zero-sequence current waveforms after two cycles of fault is obtained by combining dynamic time warping (DTW) distance with Euclidean distance, and a comprehensive similarity coefficient of each line waveform is constructed. Then fuzzy C-means clustering (FCM) algorithm is used to realize single-phase HIF line selection. In addition, because similarity of the non-faulty line transient zero-sequence current waveforms caused by the difference of line parameters in engineering application is low, the original waveform is preprocessed to improve reliability of the line selection method. Simulation results show that the proposed method is effective for both single-phase HIFs and various ground faults. Even in the extreme cases, such as noise interference, asynchronous sampling, polarity reverse connection of zero-sequence current transformer, and two-point high-impedance grounding, the line selection method is still strongly robust and fault-tolerant. © 2020, Power System Technology Press. All right reserved.
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页码：273 / 281
页数：8
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