Research on Digital Twin Analysis Technology of Electric Field in the Near Area of DC Grounding Electrode

As an important part of HVDC transmission engineering, DC grounding electrode leads the fault current into the ground when the HVDC transmission fault occurs. DC grounding electrode will cause the ground electric field exceeding the standard, which will affect the normal operation of the power system and pipeline system nearby. This paper presents a digital twinning technology of ground electric field near DC grounding electrode, and deduces the basic theory and algorithm of horizontal layered ground space potential and electric field under the condition of unlimited layers. The paper presents a digital twinning algorithm of ground potential analysis based on 45-point linear filtering method, and a digital twinning algorithm of space electric field based on 47-point linear filtering method. The effectiveness of this method is proved by case analysis, and the results are compared with the complex image method, which proves the accuracy of this algorithm. The work of this paper can provide reference for the analysis of potential and electric field near DC grounding electrode Analytical work.