摘要
为确定换流站直流场设备（包括电缆）的雷电绝缘水平,建立柔性直流工程换流站和各站直流进线段1～2 km输电线路电磁暂态仿真模型.根据线路电气结构参数确定输电线路绕击和反击电流值,雷电流采用双指数函数模型,杆塔塔头间隙闪络判据采用相交法,计算架空线路在雷电绕击和反击工况下换流站直流场设备和电缆雷电侵入波过电压.通过仿真计算,确定了换流站直流场设备和电缆雷电绝缘水平,同时计算表明,直流电抗器对雷电过电压有一定的抑制作用.
To confirm the lightning insulation level of the equipment in DC yard and the cable in converter station, a electromagnetic＂ transient simulation model is built for flexible DC transmission project, which consists of a 1 -2 km long DC transmission line in the entrance segment and a converter station. The lightning stroke current is calculated based on the electrical and structural parameters of tower-insulator-conductor. The lightning current wave is simulated by applying dual-exponential function. The tower gap flashover criterion is determined according to intersection method. The lightning invasion wave overvoltage caused by main equipment and cable in DC yard is calculated with the overhead transmission line suffering lightning. The insulation level is determined through simulation for the main equipment and cable in DC yard. In addition, the simulation shows that the DC reactor plays a certain role in controlling lightning invasion overvohage.
出处
《中国电力》
CSCD
北大核心
2015年第2期55-58,共4页
Electric Power
关键词
柔性直流输电
过电压
EGM
雷电侵入波
电缆
相交法
换流站
直流场
flexible DC transmission
overvoltage
electrical geometry model
lightning invasion wave
cable
intersection method
converter station
DC yard
