计及冲击电晕的输电线路雷电绕击和反击智能识别方法  

Identification Method of Back Flash Overvoltage and Shielding Failure of Transmission Lines Considering the Effect of Impulse Corona

作　　者：杨庆[1] 王荆[1] 陈林[1] 司马文霞[1] 谢博[1] 

机构地区：[1]重庆大学输配电装备及系统安全与新技术国家重点实验室,重庆400030

出　　处：《高电压技术》2011年第5期1149-1157,共9页High Voltage Engineering

基　　金：国家重点基础研究发展计划(973计划)(2009CB724504)~~

摘　　要：运行经验表明,直击雷是造成输电线路故障跳闸的主要原因,为了对输电线路的绕击和反击故障进行快速智能识别,评价输电线路的耐雷性能,找出线路防雷的薄弱环节,基于ATP-EMTP,建立了计及冲击电晕影响的输电线路雷电过电压仿真模型,研究了冲击电晕对输电线路过电压传播过程的影响,在此基础上根据过电压的产生机理利用数学形态谱从几何形状学的角度分析了反击和绕击过电压的波形特点,构造了形态谱特征量,通过与小波频谱特性的对比,证明了形态谱频谱特征计算结果的有效性以及该方法的快速性。并将这些特征量输入支持向量机,建立了雷电过电压的智能分类器。采用了48条饶击与反击过电压数据对该识别系统进行了验证,并取得了较高的识别准确度。验证结果表明,该方法能够有效得识别反击和绕击过电压,对线路的防雷保护提供了重要的数据参考。According to operational experience,the direct lightning strike is the main factor leading to tripping of transmission lines.The rapid intelligent identification of the back flash overvoltage and the shielding failure is of great importance to the evaluation of lightning withstand level as well as discovery of the vulnerable point for the lightning protection.Consequently,based on ATP-EMTP,a lightning overvoltage simulation model containing the influence of the impulse corona was established,and the impact of impulse corona on the propagation process of overvoltage was researched.Based on the origin mechanism of overvoltage generation,the morphological pattern spectra were applied to analyze the waveform characters of back flash overvoltage and shielding failure from the geometric configuration aspect.Moreover,compared with wavelet on frequency domain characteristics calculation,the accuracy and speed of morphology was verified.The characteristic geometric quantity of morphological pattern spectra was generated and input into the SVM to construct the intelligent classification machine.The identification accuracy was verified by 48 different overvoltages.It is verified that this method is effective in the identification of back flash overvoltage and shielding failure,and provides valuable data reference for the lightning protection of the transmission lines.

关 键 词：反击 绕击 ATP-EMTP 冲击电晕 数学形态谱 支持向量机 

分 类 号：TM862[电气工程—高电压与绝缘技术]