【摘要】：特高壓直流輸電線路承擔(dān)著遠(yuǎn)距離大容量的輸電任務(wù),在電網(wǎng)中占有非常重要的地位�！�500kV直流輸電線路的運(yùn)行經(jīng)驗(yàn)表明,雷擊是造成直流輸電線路閃絡(luò)的最主要的因素。因此線路的防雷保護(hù)對(duì)特高壓直流輸電線路的安全運(yùn)行至關(guān)重要。由于輸電線路沿線不同的地形條件、導(dǎo)線參數(shù)、桿塔設(shè)計(jì)等都會(huì)對(duì)直流輸電線路的雷電性能造成影響,因此有必要對(duì)特高壓直流輸電線路的耐雷性能進(jìn)行有針對(duì)性的研究。對(duì)雷電活動(dòng)參數(shù)的統(tǒng)計(jì)和分析,得到雷電流幅值概率分布函數(shù)和地閃密度,在此基礎(chǔ)上得到雷電閃絡(luò)率的改進(jìn)計(jì)算方法。提出綜合考慮特高壓直流輸電線路地形地貌、周圍植被情況及天氣條件外界影響因素的桿塔風(fēng)險(xiǎn)評(píng)估方法。采用AHP層次分析法評(píng)估特高壓直流輸電線路桿塔區(qū)段的雷擊閃絡(luò)風(fēng)險(xiǎn)。研究了特高壓直流輸電線路的防雷接地措施。通過分析,選定防雷接地措施,進(jìn)行接地裝置設(shè)計(jì)。同時(shí),通過對(duì)新型接地型式的分析應(yīng)用,選出適合的防雷接地措施。
[Abstract]:Ultra-high voltage direct current (UHVDC) transmission lines assume the task of long distance and large capacity transmission and occupy a very important position in the power network. The operation experience of 鹵500kV HVDC transmission lines shows that lightning strike is the most important factor causing the flashover of HVDC transmission lines. Therefore, lightning protection is very important to the safe operation of UHVDC transmission line. The lightning performance of HVDC transmission lines is affected by different terrain conditions, wire parameters and tower design, so it is necessary to study the lightning resistance performance of UHV HVDC transmission lines. Based on the statistics and analysis of lightning activity parameters, the probability distribution function of lightning current amplitude and the ground flashover density are obtained, and the improved calculation method of lightning flashover rate is obtained. A risk assessment method for pole tower is proposed, which takes into account the topography and landform of UHVDC transmission line, the surrounding vegetation and the external factors of weather conditions. The lightning flashover risk of UHVDC transmission line tower section is evaluated by AHP analytic hierarchy process (AHP). Lightning grounding measures for UHV HVDC transmission lines are studied. Through analysis, the lightning grounding measures are selected and the grounding device is designed. At the same time, through the analysis and application of the new type of grounding, the suitable lightning protection measures are selected.
【學(xué)位授予單位】：華北電力大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TM75;TM863

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相關(guān)期刊論文 前10條

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本文編號(hào)：2326278