基于熵权和TOPSIS法的山区35kV架空线路雷击风险评估

Lightning risk assessment of 35kV overhead lines in mountainous areas based on entropy weight and TOPSIS method

为了更加客观地评估山区架空线路的雷击风险,利用ATP-EMTP对不同运行条件下35kV架空线路的耐雷水平进行计算,基于熵权和TOPSIS法建立考虑山区地形地貌的雷击风险评估模型,实现对线路段-杆塔雷击风险的综合评估,并针对不同地形下的架空线路给出相应的防雷改造建议。研究结果表明:地闪密度对35kV架空线路雷击风险的影响较大,且雷击故障多由感应雷过电压引起;安装避雷器可显著提升线路的防雷能力,抑制线路雷击故障的发生,实际需根据线路所处地形和风险等级合理配置防雷方案。

In order to evaluate the lightning risk of overhead lines in mountainou areas more objectively,the lightning resistance level of the 35kV overhead line in different operating conditions is calculated based on the ATP-EMTP.A lightning strike risk assessment model considering mountainous terrain is established based on entropy weight and technique for order preference by similarity to an ideal solution(TOPSIS)method,and the comprehensive assessment of lightning risk between line section and tower is realized.The actual line is comprehensively evaluated,and the corresponding lightning protection suggestions are given for overhead lines located in different terrains.The results show that the lightning density has a great influence on the lightning risk of 35kV overhead lines,and lightning faults are mostly caused by induced lightning overvoltage.Installation of arresters can significantly improve the lightning protection ability of lines and inhibit the occurrence of lightning strike faults.The lightning protection scheme should be configured properly according to the different terrain and risk levels of the line.