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Novel Protection Scheme considering Tie Switch Operation in an Open-Loop Distribution System using Wavelet Transform

Author

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  • Hun-Chul Seo

    (School of Electronic & Electrical Engineering, Yonam Institute of Technology, Jinju-si, Gyeongsangnam-do 52821, Korea)

Abstract

Loop power distribution systems are gaining increasing attention due to improvements in the reliability of the power supply and the connection of distributed generation. With loop distribution systems, there is the possibility of mal-operation of the protection relay because of the existence of the tie switch and bi-directional current injection. In this paper, we propose a novel protection scheme considering the tie switch operation in the open loop power distribution system using wavelet transform. We analyze the possibility of mal-operation of the protection relay as a result of the normal load current after tie switch operation and analyze the characteristics of the normal load current and fault current injection after tie switch operation. Using these results, a new index is proposed to distinguish the normal load current and fault current, and a novel protection scheme based on this new index is proposed. The proposed method is modeled using an electromagnetic transients program and MATLAB, and the various simulations are performed according to the tie switch position, the fault location, and the success or failure of the fault section separation. From the simulation results, we can confirm that the normal load current and the fault current after tie switch operation can be accurately distinguished and the protection relay can accurately operate at only fault conditions.

Suggested Citation

  • Hun-Chul Seo, 2019. "Novel Protection Scheme considering Tie Switch Operation in an Open-Loop Distribution System using Wavelet Transform," Energies, MDPI, vol. 12(9), pages 1-19, May.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:9:p:1725-:d:228951
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    References listed on IDEAS

    as
    1. Stavros Lazarou & Vasiliki Vita & Lambros Ekonomou, 2018. "Protection Schemes of Meshed Distribution Networks for Smart Grids and Electric Vehicles," Energies, MDPI, vol. 11(11), pages 1-17, November.
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    Cited by:

    1. Hun-Chul Seo, 2019. "New Protection Scheme Based on Coordination with Tie Switch in an Open-Loop Microgrid," Energies, MDPI, vol. 12(24), pages 1-19, December.
    2. Hun-Chul Seo, 2020. "New Protection Scheme in Loop Distribution System with Distributed Generation," Energies, MDPI, vol. 13(22), pages 1-20, November.

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