基于场强角度的输电线路雷击概率定量评估

在电力系统智能化、信息化以及大规模电力电子器件的使用背景下,雷击对电力系统的影响越来越大。目前电力线路雷击特性的研究中,所用模型存在无法准确反映雷击物理过程的问题。据此,从雷击物理过程出发,分析了以雷击区域面积为核心的概率模型。在此基础上,以雷击过程产生的电场强度为切入点,刻画了输电线路雷击上行和下行模型,建立考虑雷击物理过程的线路雷击概率模型,并对其定量评估。通过传统仿真方法与所提方法进行对比,说明了所提方法的可行性和准确性。

Quantitative Evaluation of Probability of Lightning Stroke for Transmission Line Based on Electric Field Intensity

In the context of intelligence and informationization of power system and the use of large scale power electronic devices, the impact of lightning strokes on power system is increasing. In the current research on the characteristics of lightning strokes in power lines, the adopted models have the problem that they cannot accurately reflect the physical process of lightning strokes. Starting from the physical process of lightning strokes, a probability model centered on the area of lightning strokes is defined. On this basis, taking the electric field intensity generated in the process of lightning strokes as the starting point, the up and down models of the lightning stroke for transmission line are described, and the probability model of line lightning stroke considering the physical process of lightning strokes is established and quantitatively evaluated. The comparison between the traditional simulation method and the proposed method illustrates the feasibility and accuracy of the proposed method.