基于KL-VMD的架空线路雷击故障识别  

Lightning Fault Identification of Overhead Line Based on KL-VMD

作　　者：刘举成 董新胜[2] 何山[1,3] 张小军[2] 杨定乾[2] 胡帅[2] 李骥[2] LIU Jucheng;DONG Xinsheng;HE Shan;ZHANG Xiaojun;YANG Dingqian;HU Shuai;LI Ji(School of Electrical Engineering,Xinjiang University,Urumqi 830017,China;Xinjiang Electric Power Research Institute,Urumqi 830011,China;Engineering Research Center of Ministry of Education for Renewable Energy Power Generation and Grid Connection Control,Urumqi 830017,China)

机构地区：[1]新疆大学电气工程学院,乌鲁木齐830017 [2]国网新疆电力科学研究院,乌鲁木齐830011 [3]可再生能源发电与并网控制教育部工程研究中心,乌鲁木齐830017

出　　处：《电瓷避雷器》2024年第5期12-20,共9页Insulators and Surge Arresters

基　　金：国家自然科学基金(编号:51767024);新疆维吾尔自治区高校科研计划项目(编号:XJEDU2021I010);自治区重点研发计划项目(编号:2022B01003-3)。

摘　　要：当架空线路遭受雷击时,故障行波中存在丰富的故障信息,从暂态分量中准确提取特征量并分类是雷击故障识别的核心。提取过程中会存在模态混叠、最优小波基问题,同时雷击距离、落雷点与短路点不一致也会影响识别效果。针对上述问题,本研究提出了一种KL散度(Kullback-Leibler divergence)改进变分模态分解(Variational Mode decomposition,VMD)的雷击故障识别方法。依据实际故障搭建了220 kV架空线路模型,模拟绕击、反击和短路场景,选取三相电压进行凯伦贝尔(Karenbauer)变换解耦得到零模、线模1和线模2,对零模电压及其变化率进行KL-VMD分解,根据暂态能量比不同,构建了雷击识别判据。研究结果表明该判据可以准确辨别绕击、反击和短路故障,验证了改进VMD算法的有效性和判据识别的准确性。When the overhead line is struck by lightning,there is abundant fault information in the fault traveling wave.It is the core of fault recognition to extract and classify the characteristic from the transient component.There are some problems such as modal aliasing and optimal wavelet bases in the process of extraction.The distance of lightning stroke and the difference between lightning point and short circuit point also affect the recognition effect.In order to solve these problems,the author presents a method of lightning fault identification based on Kullback-Leibler divergence and Variational Mode decomposition(VMD).A 220 kV overhead transmission line model is built according to the actual fault,and the simulation of the shielding,flashover and short circuit scenarios is carried out,the zero-mode voltage and its rate of change are decomposed by KL-VMD,and the lightning stroke identification criterion is constructed according to the different transient energy ratio.The research results show that the criterion can accurately identify the breakdown,reaction and short-circuit fault,verifying the effectiveness of the improved VMD algorithm and the accuracy of the criterion recognition.

关 键 词：行波 KL散度 变分模态分解 零模电压 

分 类 号：TM863[电气工程—高电压与绝缘技术]