【摘要】 电网规模的扩大,已面临着输电线路走廊资源以及基础设施造价高的问题。近年来提出的交直流线路同塔多回架设的输电方式,成为了一种节约资源的选择。然而这种同塔混合多回输电线路的耐雷特性尚需进一步研究以确保输电安全。基于电磁暂态仿真软件ATP-EMTP,搭建了±800 kV/500 kV交直流同塔多回输电线路的仿真模型,分析在不同接地电阻以及杆塔高度情况下的反击耐雷水平,与单独架设的±800 kV直流线路以及500 kV交流线路进行对比;采用改进EGM和EMTP相结合,计算了交直流同塔多回输电线路的绕击跳闸率,根据仿真计算结果,提出了提高交直流同塔多回输电线路的耐雷水平的措施;降低接地电阻或者降低杆塔高度都能提高线路的反击耐雷水平; 500 kV上层外侧导线的绕击跳闸率最高,建议针对此条线路加强绝缘。更多还原

【Abstract】 With the development of grid,the problem of high transmission corridor resources and high infrastructure costs is already under way.So in some areas,in recent years,it has been put forward that the AC and DC lines with the same tower will be a kind of resource saving option.However,for the same tower lightning withstand performance of hybrid multi circuit transmission line,further study is needed to ensure the safety of transmission.Based on the ATP-EMTP a simulation model of overhead transmission line with ± 800 KV/500 AC and DC transmission lines is established.the lighting withstand performance of back striking is analyzed in different grounding resistance and different height of the tower,and compared with the separately established ± 800 kV DC line and 500 kV AC line.Using the combination of improved EGM method and EMTP,calculate the trip out rate of AC/DC combined multi tower transmission line with the same tower.Based on the simulation and calculate results,measures are put forward to improve the lightning withstand level of AC and DC transmission lines on the same tower;Reducing the grounding resistance or the height of the tower can improve the lightning withstand level of back striking;The shielding failure of the top lateral conductor of 500 kV is the highest,it is suggested that the insulation should be strengthened for this line.更多还原