组合八邻域跟踪算法监测全闪电雷暴活动时空演变过程及特征  

Spatial-Temporal Evolution Process and Characteristics of Thunderstorm Activity Based on Combinatorial Eight-Connectivity Tracking Algorithm

作　　者：黄怡鋆 樊亚东 王红斌[3] 蔡力 王建国 Huang Yijun;Fan Yadong;Wang Hongbin;Cai Li;Wang Jianguo(Engineering Research Center of Lightning Protection&Grounding Technology Ministry of Education,Wuhan 430072 China;School of Electrical Engineering and Automation Wuhan University,Wuhan 430072 China;Guangzhou Electric Power Supply Bureau,Guangzhou 510013 China)

机构地区：[1]雷电防护与接地技术教育部工程研究中心,武汉430072 [2]武汉大学电气与自动化学院,武汉430072 [3]广州供电局有限公司,广州510013

出　　处：《电工技术学报》2024年第5期1536-1547,共12页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金(52177154);中央高校基本科研业务费专项资金(2042022kf0016)资助项目。

摘　　要：雷暴是威胁电力系统安全可靠运行的重要因素,监测雷暴活动可以为电力系统雷电防护提供雷暴活动路径及预警信息。该文提出一种组合八邻域雷暴跟踪算法及跟踪结果评估指标,并采用该算法对珠三角地区九次雷暴活动进行时空演变特征分析和定量评估。结果表明,九个雷暴活动共识别出大于18 min的轨迹1490条,其中简单轨迹和含分裂合并过程的复杂轨迹各占一半。雷暴活动平均速度为51.4 km/h,速度中值为43.0 km/h,简单轨迹平均速度比复杂轨迹慢。评估指标命中率(POD)、虚假警报率(FAR)和临界成功指数(CSI)分别为64.3%、40.4%和42.7%,轨迹时长中值、平均轨迹偏差、非连贯性和平均合并分裂次数分别为24 min、2.80 km、0.0327 s^(-1)和2.51次。该方法可以很好地描述雷暴活动时空演变过程和评估跟踪结果,为雷电预警提供了有效手段。Lightning is the main cause of damages to power systems.The planning of power system transmission corridors and line lightning protection are mainly based on the lightning density and the distribution of lightning days.Measures such as reducing the grounding resistance of towers and installing lightning arresters are taken to improve the insulation level of transmission lines.The traditional lightning density and the number of thunderstorm days are not able to present the temporal and spatial evolution characteristics of thunderstorm activities.Monitoring the movement of lightning activity can provide track and warning information for lightning protection of equipment.This paper presents a combinatorial eight-connectivity tracking method and evaluation indexes based on total lightning data,which is applied to analyze the temporal and spatial evolution of lightning activities in Guangzhou.The tracking method based on total lightning data is divided into two steps:cluster identification and cluster tracking.At the step of identification,the grid method is used to pre-process the total lightning events and the lightning region(112°E~115°E,22°N~25°N)is gridded into 0.01°×0.01°grid boxes(longitude×latitude).Total lightning events are distributed into grid cells according to their geographical coordinates to form a total lightning density map in a single time interval.First,the electrically active region is identified by the 8-connectivity method and form primary lightning clusters.According to the size of the transmission line span,primary lightning clusters are merged into final lightning clusters within the distance of two grid cells.At the step of tracking,the algorithm takes influencing factors into account to match clusters between two successive time intervals,including history velocity,lightning cluster area and split-merge processes.In addition,the evaluation indexes contain the skill scores of the probability of detection(POD),false alarm ratio(FAR),and critical success index(CSI)from the contingency

关 键 词：雷暴活动 跟踪算法 评估指标 时空演变 组合八邻域 

分 类 号：TM863[电气工程—高电压与绝缘技术]