摘要
基于向家坝—上海±800 kV特高压直流输电工程,给出了两种直流滤波器暂态计算必须考虑的故障工况:直流极线接地和直流极线侵入操作波。介绍了这两种故障的模拟计算方法,给出了计算中采用的陡波模型。模型中需要考虑直流母线寄生电感、滤波器高压端电容器寄生电感和滤波器避雷器保护特性等因素。计算结果给出了电抗器和电阻器的最大暂态电流和冲击能量,根据计算得到的避雷器最大配合电流确定了避雷器的保护水平,进而依据绝缘裕度确定了该特高压直流工程直流滤波器各设备最终的绝缘水平。
Based on the ±800 kV UHVDC project from Xiangiiaba to Shanghai, two typical faults for transient calculation of DC filter including ground fault on the DC line and incoming switching surge on the DC line are presented. The simulation steep-fronted models and factors including protective characteristics of attesters, parasitic inductances of DC bus and DC filter high voltage capacitor which should be considered for these two faults are introduced. The calculation results give the transient stresses for reactors and resistors. The protective levels of arresters are obtained according to the calculated maximum arrester currents, and the withstand levels of the filter equipments are defined at last according to the insulation margin.
出处
《电力系统保护与控制》
EI
CSCD
北大核心
2012年第3期95-99,104,共6页
Power System Protection and Control
基金
国家重点基础研究发展计划项目(973项目)(2011CB209405)~~
