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Analysis of the Influence of Complex Terrain around DC Transmission Grounding Electrodes on Step Voltage

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  • Qi Xiong

    (College of Electrical Engineering & New Energy, China Three Gorges University, Yichang 443000, China
    Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology, Wuhan 430074, China)

  • Xiangyi Liu

    (College of Electrical Engineering & New Energy, China Three Gorges University, Yichang 443000, China
    Hubei Provincial Engineering Technology Research Center for Power Transmission Line, China Three Gorges University, Yichang 443000, China)

  • Yanxin Li

    (College of Electrical Engineering & New Energy, China Three Gorges University, Yichang 443000, China
    Hubei Provincial Engineering Technology Research Center for Power Transmission Line, China Three Gorges University, Yichang 443000, China)

  • Lingran Xi

    (College of Electrical Engineering & New Energy, China Three Gorges University, Yichang 443000, China
    Hubei Provincial Engineering Technology Research Center for Power Transmission Line, China Three Gorges University, Yichang 443000, China)

  • Shuang Qiu

    (College of Electrical Engineering & New Energy, China Three Gorges University, Yichang 443000, China
    Hubei Provincial Engineering Technology Research Center for Power Transmission Line, China Three Gorges University, Yichang 443000, China)

Abstract

The distribution of renewable energy sources is geographically limited. In the process of long-distance transmission, the direct current flowing from a ground electrode into the ground will cause a higher step voltage, which will bring serious security risks to the surrounding industry and life. Accurate calculation of the complex soil electrical model around the grounding electrode is crucial for site selection. Existing simulation software like CDEGS results in significant errors, particularly in complex karst topography. Therefore, constructing a finite element model that accurately reflects the characteristics of geotechnical soil near the DC grounding electrode is an essential but unresolved problem. This paper establishes a soil electrical model for karst topography and explores the impact of cave-type caverns and underground rivers on the step voltage distribution of DC grounding electrodes. These research findings can guide the site selection of DC transmission projects in karst topography.

Suggested Citation

  • Qi Xiong & Xiangyi Liu & Yanxin Li & Lingran Xi & Shuang Qiu, 2024. "Analysis of the Influence of Complex Terrain around DC Transmission Grounding Electrodes on Step Voltage," Energies, MDPI, vol. 17(2), pages 1-19, January.
    • Handle: RePEc:gam:jeners:v:17:y:2024:i:2:p:420-:d:1319453
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    References listed on IDEAS

    as
    1. Christoph Jörgens & Markus Clemens, 2021. "Electric Field and Temperature Simulations of High-Voltage Direct Current Cables Considering the Soil Environment," Energies, MDPI, vol. 14(16), pages 1-18, August.
    2. Alassi, Abdulrahman & Bañales, Santiago & Ellabban, Omar & Adam, Grain & MacIver, Callum, 2019. "HVDC Transmission: Technology Review, Market Trends and Future Outlook," Renewable and Sustainable Energy Reviews, Elsevier, vol. 112(C), pages 530-554.
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