改进先导发展模型在超特高压线路耐雷性能评估中的应用  

Improved fractal model and its application to the analysis of the lightning shielding performance of UHVDC transmission lines

作　　者：吴凡[1] 王艺霖[1] 李智[1] 

机构地区：[1]东北电力大学电气工程学院,吉林吉林132012

出　　处：《黑龙江电力》2015年第3期268-272,共5页Heilongjiang Electric Power

摘　　要：为提高雷电先导放电三维数值模拟的空间分辨率,研制了一种改进先导发展模型,即将近地区域的分辨率设置为1 m,将非近地区域的分辨率设置为50 m,进而进行三维数值模拟。在此改进模型基础上,数值模拟得到了雷电先导放电二维投影图样,并结合改进先导发展模型计算得出的绕击概率分布,得出了±500 kV直流输电线路的绕击率。以内蒙古呼伦贝尔地区伊穆±500 kV超高压直流输电线路为例,通过比较自然界中雷电放电与模拟结果的分形维数验证了该模型的合理性。In order to improve the spatial resolution of 3d numerical simulation of lightning shielding fractal discharging,this paper proposes an improved fractal model,which is the three- dimensional numerical simulation of lightning discharge with resolution of 50 m on the basis of the fractal theory and with resolution of 1m in the protection zone. On the basis of the improved model,the application of the method to estimate the lightning shielding performance of UHVDC transmission lines could be obtained. Moreover,through the combination of the lightning current space probability with the lightning shielding failure probability from the fractal model,the lightning shielding failure rate of the transmission lines could be obtained. Taking the ± 500 kV UHVDC transmission lines in Inner Mongolia as an example,the rationality of the numerical simulation is verified by comparing the statistical values of parameters of natural lightning discharges and simulation results.

关 键 词：超特高压 介质击穿模型(DBM) 雷电放电 先导发展模型 

分 类 号：TM862[电气工程—高电压与绝缘技术]