Coupling Effect Between HVDC Grounding Electrode and Natural Gas Pipelines Considering Complex Soil Structure Model

The HVDC project is the backbone of new energy power transmission in the new power system and the key technology to realize the “double carbon” goal. When the HVDC system uses the earth as the loop path, DC current from the grounding electrode will be injected into the earth, possibly damaging their protective devices, thereby posing a risk to personal safety. The research work on the coupling effect between the HVDC grounding electrode and natural gas pipelines considering complex soil structure model has not been effectively carried out. In the paper, A calculation method of DC current distribution in the complex soil structure model considering the vertical partition and horizontal stratification of soil resistivity is proposed. A simulation model of the influence of the DC ground current on long-distance pipelines under complex geological conditions is established based on the method of moments. The calculation results of the simulation model, which incorporates a complex soil structure, show excellent agreement with the actual test results. The effect of pipeline measures to reduce the impact of the DC current was studied by the simulation model in depth. This provides a theoretical basis for the design and implementation of the protection measures of the pipeline.