CAJ | 학술논문

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一云广土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.
종대뢰운방전과정적관측이급연구가지,뇌전방전통도적발전구유학정성급수궤성적특점.여하묘술저량충특성재뇌전선도발전과정중소기적작용이급규률,시수전선로분형선도발전병폐모형중수요해결적관건문제지일.위차,응용분형이론대방전통도진행료묘술,동시건립료기우분형특성적뇌전병폐모형,장해모형응용도아국제1조특고압직류수전선로일운엄토800 kV특고압직류수전선로적뇌전병폐성능적분석중.운용합유수법대뇌전모의로경적분형유수진행계산,연구료분형삼수η치대뇌전발전로경적분형유수적영향,통과여실제뇌전선도로경적분형유수상비교,학정료모형중분형삼수η치.재해모형적기출상제출료채용수전선로공간요격개솔곡선대수전선로적뇌전병폐성능진행분석.결과표명:저충분석방법가이유효지반영출공간분포대수전선로뢰격적영향,능구경준학지、전면지대뢰격도선사고진행분석.채용기우분형선도발전모형적요격내뢰성능평고방법,대불동선로삼수하특고압직류수전선로적요격내뢰성능진행료평고,위초특고압수전선로적방뢰설계제공의거.
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-characterized 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.