本文選題：雷電流幅值概率分布　切入點：地閃密度分布　出處：《重慶大學》2014年碩士論文　論文類型：學位論文

【摘要】：隨著高壓輸電技術的迅猛發(fā)展，線路走廊寬度、桿塔高度等隨著輸電線路電壓等級的提高而增加，線路遭受雷擊的可能越來越大，雷電災害造成的經(jīng)濟損失和人員傷亡更加普和嚴重。因此，研究區(qū)域雷電活動規(guī)律，準確評估輸電線路耐雷性能，提出合理的防雷措施，減小雷擊事故造成的損失和輸電線路防雷成本是當前亟待解決的問題。 本文對雷電活動規(guī)律以及輸電線路防雷性能進行了深入研究，提出了輸電線路雷擊風險評估模型和評估參數(shù)體系，綜合考慮各種風險指標，建立了輸電線路雷擊風險評估模型，實現(xiàn)線路的差異化雷擊風險評估。主要工作如下： ①本文提出了從桿塔到桿塔區(qū)段再到輸電線路的層級式評估結構，建立了由雷擊跳閘率、雷擊跳閘風險、雷擊故障風險、輸電線路風險四個部分構成的風險評估參數(shù)體系。 ②從實際雷電活動情況出發(fā)，篩選給定區(qū)域內(nèi)雷電定位系統(tǒng)監(jiān)測的數(shù)據(jù)，用數(shù)據(jù)分析軟件擬合該區(qū)域的雷電流幅值概率分布函數(shù)，地閃密度GPD模型；通過分析影響桿塔耐雷水平的因素，得到桿塔的繞擊耐雷水平和反擊耐雷水平與桿塔耐雷水平之間的物理聯(lián)系及函數(shù)關系；在分析雷電參數(shù)分布規(guī)律和桿塔耐雷水平的基礎上，提出了改進雷擊跳閘率計算方法，，雷擊跳閘率計算結果更接近實際統(tǒng)計值。 ③以桿塔作為輸電線路雷擊風險評估的基本單元，綜合考慮輸電線路所在區(qū)域的地形地貌及氣候條件，評估每一基桿塔的雷擊跳閘風險；應用改進層次分析法確定桿塔區(qū)段的雷擊跳閘風險權重，建立了輸電線路風險評估模型，實現(xiàn)了桿塔區(qū)段雷擊跳閘風險的排序，可用于確定輸電線路的薄弱區(qū)段。 ④三條110kV、220kV、500kV輸電線路雷電風險評估結果表明，該方法比僅用雷擊跳閘率作為輸電線路評估指標的風險評估法更準確，能實現(xiàn)從桿塔、桿塔區(qū)段到全線的風險評估，適用性更強。
[Abstract]:With the rapid development of HV transmission technology, the width of the corridor and the height of the tower increase with the increase of the voltage level of the transmission line, and the lightning strike of the transmission line is more and more likely. The economic losses and casualties caused by lightning disasters are more common and serious. Therefore, the study of regional lightning activity rules, the accurate evaluation of lightning resistance performance of transmission lines, the proposed reasonable lightning protection measures, It is an urgent problem to reduce the loss caused by lightning strike and the lightning protection cost of transmission line. In this paper, the lightning activity law and lightning protection performance of transmission line are studied deeply, and the risk assessment model and parameter system of transmission line lightning strike are put forward, and all kinds of risk indexes are considered synthetically. The lightning stroke risk assessment model of transmission line is established to realize the differentiated lightning stroke risk assessment of transmission lines. The main work is as follows:. In this paper, a hierarchical evaluation structure from tower to tower to transmission line is proposed, and a risk evaluation parameter system is established, which consists of four parts: lightning tripping rate, lightning tripping risk, lightning tripping risk and transmission line risk. (2) based on the actual lightning activity, the monitoring data of lightning location system in a given area are screened, and the probability distribution function of lightning current amplitude is fitted by data analysis software, and the GPD model of ground flicker density is obtained. Based on the analysis of the factors affecting the lightning resistance of the tower, the physical relation and the functional relationship between the lightning resistance level of the tower and the lightning resistance level of the tower are obtained, and the distribution law of lightning parameters and the lightning resistance level of the tower are analyzed based on the analysis of the lightning resistance level of the tower, and the relationship between the lightning resistance level of the tower and the lightning resistance level of the tower is obtained. An improved method for calculating the lightning tripping rate is presented. The calculated result of the lightning tripping rate is closer to the actual statistical value. (3) taking the pole tower as the basic unit of lightning stroke risk assessment of transmission lines, considering the terrain, geomorphology and climate conditions of the transmission line area, the lightning tripping risk of each base tower is evaluated. Based on the improved Analytic hierarchy process (AHP), the lightning tripping risk weight of the tower section is determined, and the transmission line risk assessment model is established, which can be used to determine the weak section of the transmission line. 4 the results of lightning risk assessment for three 110kV / 220kV / 500kV transmission lines show that this method is more accurate than the risk assessment method using only lightning tripping rate as the evaluation index of transmission lines, and it can realize the risk assessment from pole tower, pole tower section to the whole line, and is more applicable.
【學位授予單位】：重慶大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM863

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