本文選題：差異化防雷 + 繞擊多參數(shù)幾何模型��； 參考：《三峽大學(xué)》2016年碩士論文

【摘要】：隨著我國(guó)高壓電網(wǎng)的快速發(fā)展,輸電線路的電壓等級(jí)越來越高,輸送容量的不斷提升,電網(wǎng)安全運(yùn)行在系統(tǒng)中的重要性也越來越高。此外,桿塔高度和線路走廊的尺寸也隨之增大,引雷半徑自然也增加,電網(wǎng)遭受自然雷害的機(jī)率更大。目前,電網(wǎng)中暴露出的弱抗雷擊風(fēng)險(xiǎn)能力已對(duì)電網(wǎng)的安全運(yùn)行構(gòu)成威脅。因此,精確、全面的輸電線路防雷性能評(píng)估方法對(duì)線路設(shè)計(jì)和針對(duì)性地采取防雷措施具有極其重要的指導(dǎo)意義,是減少雷害事故,保證電網(wǎng)安全供電,為建設(shè)堅(jiān)強(qiáng)電網(wǎng)提供有力保障的理論基礎(chǔ)。繞擊是輸電線路防雷性能評(píng)估中的關(guān)鍵環(huán)節(jié)之一,本文針對(duì)目前差異化繞擊耐雷性能分析中存在的部分關(guān)鍵問題進(jìn)行了分析和研究,并以此為基礎(chǔ),搭建了考慮多項(xiàng)參數(shù)共同影響下的輸電線路繞擊差異化耐雷性能評(píng)估模型,主要研究?jī)?nèi)容包括:1)基于傳統(tǒng)的電氣幾何模型(EGM),建立輸電線路的二維幾何坐標(biāo)系,對(duì)傳統(tǒng)模型的雷電先導(dǎo)入射角、擊距以及暴露距離進(jìn)行修改,得到改進(jìn)的電氣幾何模型,從而推導(dǎo)了基于幾何坐標(biāo)的最大擊距和暴露距離計(jì)算公式,構(gòu)建出一套考慮多參數(shù)的繞擊跳閘率計(jì)算模型,并以國(guó)外某345kV輸電線路為例,利用該模型計(jì)算該線路繞擊跳閘率,將計(jì)算結(jié)果與運(yùn)行經(jīng)驗(yàn)值、傳統(tǒng)方法計(jì)算值進(jìn)行了對(duì)比分析,驗(yàn)證了模型的合理性,且誤差相對(duì)于傳統(tǒng)電氣幾何模型降低了56.15%。2)針對(duì)地面落雷密度經(jīng)典網(wǎng)格統(tǒng)計(jì)法存在的“噪點(diǎn)”問題,引入中值濾波理論及其算法,得到了改進(jìn)的地面落雷密度網(wǎng)格統(tǒng)計(jì)法。利用該統(tǒng)計(jì)方法對(duì)模擬地面落雷密度統(tǒng)計(jì)分布圖的獲取進(jìn)行了嘗試,并將一次三階、二次三階濾波統(tǒng)計(jì)結(jié)果與經(jīng)典網(wǎng)格法統(tǒng)計(jì)值進(jìn)行對(duì)比分析,驗(yàn)證了濾波的有效性;獲取中值濾波地面落雷密度統(tǒng)計(jì)值后,通過線路走廊網(wǎng)格法估計(jì)輸電線路走廊地面落雷密度值,采用研究得到的繞擊耐雷性能多參數(shù)幾何模型,對(duì)輸電線路沿線逐基桿塔進(jìn)行繞擊跳閘率計(jì)算,研究并建立了輸電線路差異化繞擊耐雷性能評(píng)估模型。3)基于前文成果,研制開發(fā)了輸電線路雷擊風(fēng)險(xiǎn)評(píng)估系統(tǒng),該系統(tǒng)能夠?qū)崿F(xiàn)線路防雷水平的準(zhǔn)確計(jì)算,明確雷擊薄弱點(diǎn),為線路防雷工作的開展提供決策依據(jù);以三門峽地區(qū)110kV朱明線為例,應(yīng)用該評(píng)估模型對(duì)具體輸電線路進(jìn)行了繞擊耐雷性能的評(píng)估,并將評(píng)估結(jié)果與實(shí)際運(yùn)行數(shù)據(jù)進(jìn)行對(duì)比分析,驗(yàn)證了該評(píng)估模型的工程適用性。
[Abstract]:With the rapid development of high voltage power grid in our country, the voltage level of transmission line is higher and higher, and the transmission capacity is increasing, the importance of safe operation of power network in the system is becoming more and more important. In addition, the height of the tower and the size of the corridor also increase, the lightning radius increases naturally, and the power grid is more likely to suffer from natural lightning damage. At present, the ability of weak lightning exposure in the power grid has posed a threat to the safe operation of the power grid. Therefore, accurate and comprehensive assessment method of lightning protection performance of transmission lines has an extremely important guiding significance for line design and targeted lightning protection measures, which is to reduce lightning accidents and ensure the safe power supply of power grid. To build a strong power grid to provide a theoretical basis for the protection. Wound strike is one of the key links in the lightning protection performance evaluation of transmission lines. This paper analyzes and studies some key problems existing in the analysis of lightning resistance performance of differential wound strike at present, and based on this analysis, The performance evaluation model of differential lightning resistance for transmission lines under the influence of several parameters is built. The main research contents include: 1) based on the traditional electrical geometry model, the two-dimensional geometric coordinate system of transmission line is established. An improved electrical geometric model is obtained by modifying the incident angle, strike distance and exposure distance of the lightning pilot in the traditional model, and the formulas for calculating the maximum strike distance and exposure distance based on geometric coordinates are derived. A multi-parameter calculation model of tripping rate is established. Taking a 345kV transmission line abroad as an example, the model is used to calculate the tripping rate of the line. The calculated results are compared with the operating experience value and the traditional calculation value. The rationality of the model is verified, and the error is reduced by 56.15. 2 compared with the traditional electrical geometry model. Aiming at the "noise point" problem existing in the classical grid statistical method of ground lightning density, the median filtering theory and its algorithm are introduced. An improved grid statistical method of ground drop density is obtained. The statistical method is used to obtain the statistical distribution map of simulated ground lightning density, and the statistical results of the first third order and the second third order filter are compared with those of the classical grid method, and the validity of the filter is verified. After obtaining the statistical value of ground lightning drop density of median filter, the ground lightning drop density value of transmission line corridor is estimated by the method of line corridor grid, and the multi-parameter geometric model of lightning resistance performance is adopted. Based on the previous results, a lightning risk assessment system for transmission lines is developed based on the calculation of the tripping rate of transmission line towers, and the study and establishment of the lightning performance evaluation model. The system can accurately calculate the lightning protection level of the line, identify the weak points of the lightning strike, and provide the decision basis for the development of the lightning protection work of the line, taking 110kV Zhu Ming line in Sanmenxia area as an example, The evaluation model is used to evaluate the lightning resistance performance of specific transmission lines, and the engineering applicability of the evaluation model is verified by comparing the evaluation results with the actual operation data.
【學(xué)位授予單位】：三峽大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：TM863

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本文編號(hào)：2002346