±800 kV特高压换流站绝缘配合方案的普适性仿真分析
Simulation Analysis of Influence of DC Protection on the Overvoltage and Insulation Coordination of ±800 kV UHVDC Converter Stations
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摘要:
特高压直流换流站绝缘配合方案对工程的技术经济性能影响较大。针对国内外± 800 kV换流站尚无统一绝缘配合方案的情况，基于对现有绝缘配合方案的对比分析选取一种典型方案，在± 800 kV直流输电工程的经济输送距离和输送容量下开展换流站绝缘配合方案的普适性研究。采用PSCAD/EMTDC仿真软件分析了输送距离和输送容量对绝缘配合方案的影响。仿真分析结果表明输送距离的变化对换流站绝缘配合方案影响不大，输送容量的增加对个别避雷器应力影响较大，但可以通过增加避雷器并联台数以保证避雷器保护水平或设备绝缘水平不变，研究结论可为换流站设计的标准化提供参考。 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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