Faulty Line Selection Method Based on Comprehensive Dynamic Time Warping Distance in a Flexible Grounding System

Yu He, Xinhui Zhang, Wenhao Wu, Jun Zhang, Wenyuan Bai, Aiyu Guo and Yu Chen
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Yu He: School of Electrical and Electronic Engineering, Shandong University of Technology, Zibo 255000, China
Xinhui Zhang: School of Electrical and Electronic Engineering, Shandong University of Technology, Zibo 255000, China
Wenhao Wu: School of Electrical and Electronic Engineering, Shandong University of Technology, Zibo 255000, China
Jun Zhang: School of Electrical and Electronic Engineering, Shandong University of Technology, Zibo 255000, China
Wenyuan Bai: School of Electrical and Electronic Engineering, Shandong University of Technology, Zibo 255000, China
Aiyu Guo: School of Electrical and Electronic Engineering, Shandong University of Technology, Zibo 255000, China
Yu Chen: School of Electrical and Electronic Engineering, Shandong University of Technology, Zibo 255000, China

Energies, 2022, vol. 15, issue 2, 1-16

Abstract: A flexible grounding system is a system in which the neutral point of the power supply is grounded via the arc suppression coil in parallel with a low-resistance resistor. When operating normally or a temporary ground fault occurs, the arc suppression coil is used for grounding, whereas the small resistance is switched on when a permanent ground fault occurs. At present, the problem of low protection sensitivity when a high-resistance ground fault occurs in a flexible grounding system has not been solved yet. According to the characteristics of low waveform similarity between the faulty line and the non-faulty line when a single-phase grounding fault occurred, a new faulty line selection method based on a combination of Dynamic Time Warping (DTW) distance and the transient projection method is proposed in this paper. Firstly, the fault transient signal is extracted by a digital filter as a basis for faulty line selection. Secondly, the transient zero-sequence current of each line is projected onto the busbar transient zero-sequence voltage, and the projected DTW distance of each line is calculated. Finally, according to the calculation formula of waveform comprehensive similarity coefficient, the Comprehensive DTW (CDTW) distance is obtained, and the top three CDTW distance values are selected to determine the faulty line. If the maximum value is greater than the sum of the other two CDTW distance values, the line corresponding to the maximum value is judged as the faulty line; otherwise, it is judged as a busbar fault. The simulation results based on MATLAB/Simulink and field data test show that the method can accurately determine the faulty line under diverse fault conditions.

Keywords: flexible grounding system; faulty line selection; single-phase grounding fault; Comprehensive Dynamic Time Warping (CDTW) distance; transient projection method (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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