Abstract
DC magnetic biasing problem,caused by the DC grounding electrode, threatened the safe operation of AC power grid. In this paper, the characteristics of the soil stratification near DC grounding electrode was researched. The AC-DC interconnected large-scale system model under the monopole operation mode was established. The earth surface potential and DC current distribution in various stations under the different surface thickness was calculated. Some useful conclusions are drawn from the analyzed results.
Highlights
IntroductionAt this point, DC flowed through the grounding electrode into the earth, and its breadth and depth of the diffuser was still an open
The study of surface potential and DC current distribution was of great significance
Take the Shanxi-Jiangsu ± 500 kV DC transmission line project for example, which was from ± 500 kV HVDC converter stationto another one(in Liyang, Jiangsu province)
Summary
At this point, DC flowed through the grounding electrode into the earth, and its breadth and depth of the diffuser was still an open. The negative effects of this operation mode had been a consensus[1-18], mainly the following three points: electromagnetic effect, thermal effect and eletrochemical effect. The surface potential distribution was a kind of electromagnetic effects. In this commissioning and operation of DC transmission system, these problems really existed. The study of surface potential and DC current distribution was of great significance
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