Optimization Design of Distributed HVDC Ground Electrode

To overcome the limitations of HVDC ground electrodes in dc bias of transformer and grounding performance, design concept of distributed groundelectrodes is put forward in this paper. Three kinds of distributed groundelectrodes simulation models are discussed and the difference between them is analyzed with practical examples. The complete calculation model and the simplified calculation model can achieve the same results, but the results of the circuit model may has obvious error because of the ignorance of sub-electrode mutual-resistance. A newly established HVDC electrode based on the global optimal position chaos particle swarm optimization algorithm and an optimization method of substation site selection are proposed, the effect of substation site selection optimization is studied by taking Hubei AC/DC hybrid power grid as an example. Practical application of the distributed groundelectrodes is shown taking the example of Hubei power grid. Current distribution, relief for HVDC magnetic biasing of transformers in power grid and impact on the environment of distributed groundelectrodes are analyzed, which provides reference for the application of the distributed groundelectrodes.