New research progress of HVDC transmission technology in China Southern Power Grid Corporation

摘要

With more and more HVDC transmission projects built and becoming operational, more issues are emerging. The increasing scarcity of land resources narrows down the choice of sites for ground electrodes and makes site selection ever difficult. Studies on the deep well grounding technique show that the currents flowing into the earth can be brought far below the surface and the line corridor and land use can be significantly reduced. High altitude and high-intensity earthquakes present major challenges to the seismic performance of high voltage equipment in converter stations, and therefore, various types of equipment require testing and simulation for verification of seismic performance, and equipment that is able to meet the seismic performance requirements needs to be developed. In addition, to enable flexible electric power dispatching, high security and stability, and DC interconnected power system, flexible multi-terminal HVDC technologies need to be promoted with great efforts.