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

Author

Listed:
  • 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)

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.

Suggested Citation

  • Yu He & Xinhui Zhang & Wenhao Wu & Jun Zhang & Wenyuan Bai & Aiyu Guo & Yu Chen, 2022. "Faulty Line Selection Method Based on Comprehensive Dynamic Time Warping Distance in a Flexible Grounding System," Energies, MDPI, vol. 15(2), pages 1-16, January.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:2:p:471-:d:721507
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    References listed on IDEAS

    as
    1. Yaojing Tang & Yongle Chang & Jinrui Tang & Bin Xu & Mingkang Ye & Hongbo Yang, 2021. "A Novel Faulty Phase Selection Method for Single-Phase-to-Ground Fault in Distribution System Based on Transient Current Similarity Measurement," Energies, MDPI, vol. 14(15), pages 1-19, August.
    2. Wenquan Shao & Jie Bai & Yuan Cheng & Zhihua Zhang & Ning Li, 2019. "Research on a Faulty Line Selection Method Based on the Zero-Sequence Disturbance Power of Resonant Grounded Distribution Networks," Energies, MDPI, vol. 12(5), pages 1-18, March.
    3. Veerapandiyan Veerasamy & Noor Izzri Abdul Wahab & Rajeswari Ramachandran & Muhammad Mansoor & Mariammal Thirumeni & Mohammad Lutfi Othman, 2018. "High Impedance Fault Detection in Medium Voltage Distribution Network Using Discrete Wavelet Transform and Adaptive Neuro-Fuzzy Inference System," Energies, MDPI, vol. 11(12), pages 1-24, November.
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