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

Qi Xiong, Xiangyi Liu (), Yanxin Li, Lingran Xi and Shuang Qiu
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Qi Xiong: College of Electrical Engineering & New Energy, China Three Gorges University, Yichang 443000, China
Xiangyi Liu: College of Electrical Engineering & New Energy, China Three Gorges University, Yichang 443000, China
Yanxin Li: College of Electrical Engineering & New Energy, China Three Gorges University, Yichang 443000, China
Lingran Xi: College of Electrical Engineering & New Energy, China Three Gorges University, Yichang 443000, China
Shuang Qiu: College of Electrical Engineering & New Energy, China Three Gorges University, Yichang 443000, China

Energies, 2024, vol. 17, issue 2, 1-19

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.

Keywords: direct current electrode; step voltage; karst cave; underground river (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: 2024
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