雷击输电线路电磁暂态仿真

雷击输电线路会引起强烈的冲击电晕,目前常用的电磁暂态仿真软件中没有冲击电晕的模型,无法对其进行仿真。通过对冲击电晕的伏库特性的分析,得到冲击电晕的等效电路,并与现有比较成熟的Marti线路模型相结合,提出了一种既考虑冲击电晕又考虑线路参数频变的电磁暂态仿真方法。通过雷击输电线路的电磁暂态仿真表明,有否考虑冲击电晕其电晕的电磁暂态过程相差很大,在研究行波保护的雷电波抗干扰方法以及线路、变电站的过电压计算时应该考虑冲击电晕对电磁暂态过程的影响。

New Electromagnetic Transient Simulation Approach Considering Impulsive Corona and Frequency-dependence Line Parameters

Lightning strike on transmission lines brings about intense impulsive corona. However, in many currently available electromagnetic transient simulation software packages, such as EMTP, EMTDC, MATLAB, model of impulsive corona is not included, that results in difficulty to simulate impulsive corona by using those software packages. Hence, in this paper the equivalent circuit of impulsive corona is derived based on the analysis of V-Q characteristic of impulsive corona. Furthermore, a electromagnetic transient simulation method considering both impulsive corona and frequency-dependence line parameters is presented by combining existing and mature Marti model. Large amount of simulations show that the results considering corona are quite different with those without taking account of corona. Therefore the paper concludes that the influence of impulsive corona should be considered in the study of the lightning strike on lines.