基于过程的输电线路雷电活动描述新方法  

A New Description Method of Lightning Activity Around Transmission Line Based on Process

作　　者：吴敏[1] 王韬[1] 赵淳[1] 王佩[1] 郭钧天[1] 陈路 潘佳鑫 罗飞[2] 

机构地区：[1]国网电力科学研究院武汉南瑞有限责任公司,湖北省武汉市430074 [2]武汉大学计算机学院,湖北省武汉市430072

出　　处：《电网技术》2018年第3期989-995,共7页Power System Technology

基　　金：国家自然科学基金项目(61402340);国家电网公司科技指南项目(WNZ151-0009)~~

摘　　要：传统雷电数量强度的描述方法是基于单次落雷的雷电日作为统计单位。但以雷电次数、雷电日指标衡量雷电活动,无法反映出区域内雷电活动的过程信息,特别是一年中雷电分散在多少次雷电活动过程以及每次过程中雷暴团运动与线路之间的方位关系。为此,提出了一种基于过程计量单位的输电线路雷电活动描述方法。该方法将统计时间段平均划分为若干连续时间片,统计时间片内线路区域的雷击次数,得到统计时间段内雷电次数曲线。运用小波平滑处理曲线,除去雷电过程瞬时减弱对曲线产生的噪声影响,准确截取雷电过程起止时间点。最后,利用聚类提取每次过程中雷暴中心并依据雷暴中心距离关系分别追踪运动轨迹。以湖北省一条线路开展实验,结果表明该方法准确地得出该线路区域2013年、2014年各有19、15次雷电过程,并追踪出每次雷电过程的雷暴团运动轨迹,验证了算法的有效性。Lightning is the main external risk source of transmission lines.When monitoring lightning in area with transmission lines crossing,traditional methods of describing lightning quantity and intensity are always based on lightning day and lightning number in a lightning day.However,detailed information is ignored in these methods,especially how many lightning processes are distributed in all lightning activities in a year,and the position relationship between thunderstorm movement and transmission lines in a process.Therefore,a new method using lightning process as basic unit is proposed to describe lightning activities around transmission lines.This method divides a time period into many continuous time clips and counts each clip＇s lightning number in transmission line area to obtain lightning number curve during the time period.Then wavelet smoothing is used to remove the disturbance when lightning process weakens abruptly and extracts time boundary of each lightning process accurately.Finally,clustering algorithm is used to extract centers of the thunderstorms whose trajectories are traced based on distance relationship in each process.On a transmission line in Hubei province,with this method,it is observed that in 2013 and 2014 numbers of lightning process in this transmission line area were 19 and 15 respectively and trajectory of each lightning process was traced,thus verifying this new method＇s effectiveness.

关 键 词：雷电监测 输电线路 过程 雷暴团 

分 类 号：TM86[电气工程—高电压与绝缘技术]