Simulation Analysis of Influence of DC Protection on the Overvoltage and Insulation Coordination of ±800 kV UHVDC Converter Stations
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Abstract
The insulation coordination of the ultra-high voltage direct current (UHVDC) converter station is very important for the engineering technical and economic performance of the UHVDC transmission system project.At home and abroad, there is no uniform insulation coordination scheme of the ± 800 kV converter station, this paper selects a typical scheme based on the comparison and analysis of the existing insulation coordination scheme, carries out the universality of the research on the insulation coordination scheme under the economic transmission distance and transmission capacity of ± 800 kV HVDC project. By using the PSCAD/EMTDC program, it mainly analyzes the influence of the transmission distance and transmission capacity on the insulation coordination scheme. The simulation results show that the influence of the change of transmission distance on the insulation coordination scheme of converter station is little, while the influence of the increase of transmission capacity on the stress of the individual arrester is large, arrester protection level or equipment insulation level can remain the same by increasing the parallel numbers of arresters. The study results of this paper can provide references for standardization of converter station design.
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