雷电先导分形特性及其在特高压线路耐雷性能分析中的应用  

Fractal Characteristics of Lightning Channels and Its Application to the Analysis of the Lightning Shielding Performance of UHVDC Transmission Lines

作　　者：司马文霞[1] 李建标[1] 杨庆[1] 袁涛[1] 伏进[1,2] 

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 [2]重庆市杨家坪供电局,重庆400051

出　　处：《高电压技术》2010年第1期86-91,共6页High Voltage Engineering

基　　金：国家重点基础研究发展计划(973计划)(2009CB724504);国家自然科学基金(50707036)~~

摘　　要：从对雷云放电过程的观测以及研究可知,雷电放电通道的发展具有确定性及随机性的特点。如何描述这两种特性在雷电先导发展过程中所起的作用以及规律,是输电线路分形先导发展屏蔽模型中需要解决的关键问题之一。为此,应用分形理论对放电通道进行了描述,同时建立了基于分形特性的雷电屏蔽模型,将该模型应用到我国第1条特高压直流输电线路—云广±800 kV特高压直流输电线路的雷电屏蔽性能的分析中。运用盒维数法对雷电模拟路径的分形维数进行计算,研究了分形参数η值对雷电发展路径的分形维数的影响,通过与实际雷电先导路径的分形维数相比较,确定了模型中分形参数η值。在该模型的基础上提出了采用输电线路空间绕击概率曲线对输电线路的雷电屏蔽性能进行分析。结果表明:这种分析方法可以有效地反映出空间分布对输电线路雷击的影响,能够更准确地、全面地对雷击导线事故进行分析。采用基于分形先导发展模型的绕击耐雷性能评估方法,对不同线路参数下特高压直流输电线路的绕击耐雷性能进行了评估,为超特高压输电线路的防雷设计提供依据。The progression of lightning path is characterized by both deterministic and stochastic factors. How to describe the functions of these two factors in the lightning progressing process is one of the key problems to be solved by the fractal characterized LPM. Consequently, the fractal theory is used to describe the lightning channel; the fractal-characterized LPM will be developed and applied to the research on the lightning shielding performance of the first UHVDC transmission line in± 800 kV UHVDC transmission line in Yunnan and Guangdong province. Firstly, the fractal dimensions of the lightning simulating path are calculated by the box-counting method. The influence of η value on the fraetal dimension of the lightning progressing path is researched, and the range of η value is determined. Based on the fractal-characterized LPM, the lightning shielding failure probability curve of the transmission line space is used to analyze the lightning shielding performance of transmission lines, because this method can effectively reflect the features of transmission lines suffered from lightning strikes, and can analyze the lightning striking accidents on conductors more exactly. Secondly, based on the fractal-eharacterized LPM and its estimating method, the lightning shielding performance of UHVDC transmission lines under different lines parameters, are estimated, providing reference for the design of the lightning protection of EHV and UHV transmission lines.

关 键 词：特高压 绕击 分形理论 先导发展模型 随机 分形维数 

分 类 号：TM862[电气工程—高电压与绝缘技术]