【摘要】：隨著我國工業(yè)經(jīng)濟的不斷發(fā)展，電力系統(tǒng)超高壓電網(wǎng)也在不斷提高和改進，特別是超高壓輸電線路的高度、傳輸距離等都在不斷提高。我國幅員遼闊，有著復(fù)雜多樣的地形地貌，高壓架空輸電線路在曠野中經(jīng)受到各種各樣的考驗。雷擊故障時有發(fā)生，對我國超高壓電網(wǎng)的運行造成威脅。近年來，，隨著同塔雙回輸電線路這種輸電方式的廣泛應(yīng)用，其設(shè)計、制造、施工和運行已經(jīng)非常成熟，但是，由雷擊輸電線路造成的電網(wǎng)事故仍然不斷發(fā)生。為了制定更有效的防雷對策，減少雷擊事故的發(fā)生，需要更準(zhǔn)確的研究分析雷擊輸電線路的雷電過電壓的瞬態(tài)特性。通過仿真模擬，探索其規(guī)律，可以對新線路的防雷設(shè)計提供有價值的參考，并且對提高現(xiàn)有輸電線路雷電防護水平有著深遠的意義和工程實用價值。 本文根據(jù)輸電線路雷電反擊過電壓和雷電繞擊過電壓的產(chǎn)生機理，利用電磁暫態(tài)仿真程序PSCAD/EMTDC對500kV超高壓同塔雙回輸電線路的雷電過電壓的瞬態(tài)特性進行了仿真分析。輸電線路雷擊仿真模型的建立包括雷電流模型、輸電線路模型、桿塔模型、絕緣子閃絡(luò)模型以及避雷器模型，基于PSCAD/EMTDC雷電仿真模型分別對雷電反擊故障和雷電繞擊故障產(chǎn)生的雷電過電壓的瞬態(tài)特性進行了分析，研究了影響同塔雙回輸電線路反擊過電壓和繞擊過電壓的影響因素，并重點分析了加裝線路避雷器、不平衡絕緣的防雷措施對提高輸電線路耐雷水平的效果。最后根據(jù)某省500kV超高壓輸電線路的實際工況，對其近年來的雷擊跳閘事故進行了統(tǒng)計分析，并針對特定的反擊和繞擊故障進行了仿真模擬，提出有效的防雷策略。本文的研究成果對500kV超高壓輸電線路雷電過電壓的研究及同塔雙回輸電線路的防雷策略研究提供了有價值的參考。
[Abstract]:With the continuous development of our country's industrial economy, the ultra-high voltage power grid of power system is also continuously improved and improved, especially the height and transmission distance of ultra-high voltage transmission lines are constantly increasing. China has a vast territory and various landforms. High-voltage overhead transmission lines have been tested in the wilderness. Lightning strikes occur frequently, which threaten the operation of ultra-high voltage power grid in China. In recent years, with the wide application of double-circuit transmission line with the same tower, its design, manufacture, construction and operation have been very mature. However, the power network accidents caused by lightning strike transmission line are still occurring. In order to make more effective anti-lightning countermeasures and reduce the occurrence of lightning strike accidents, it is necessary to study and analyze the transient characteristics of lightning over-voltage of lightning-struck transmission lines more accurately. It can provide valuable reference for lightning protection design of new transmission lines through simulation and explore its regularity, and has far-reaching significance and practical value in engineering for improving lightning protection level of existing transmission lines. According to the generation mechanism of lightning over-voltage and lightning bypass overvoltage of transmission line, the transient characteristics of lightning over-voltage of 500kV ultra-high voltage and double-circuit transmission line with tower are simulated and analyzed by using electromagnetic transient simulation program PSCAD/EMTDC. The simulation model of lightning strike of transmission line includes lightning current model, transmission line model, tower model, insulator flashover model and lightning arrester model. Based on the PSCAD/EMTDC lightning simulation model, the transient characteristics of lightning overvoltage caused by lightning backlash fault and lightning bypass fault are analyzed, and the factors affecting the return back overvoltage and bypass overvoltage of the same tower double-circuit transmission line are studied. The lightning protection effect of installing line lightning arrester and unbalanced insulation to improve the lightning resistance level of transmission line is analyzed in detail. Finally, according to the actual conditions of 500kV EHV transmission lines in a province, the lightning tripping accidents in recent years are statistically analyzed, and the simulation of specific counter-attack and bypass faults is carried out, and an effective lightning protection strategy is put forward. The research results of this paper provide a valuable reference for the study of lightning overvoltage of 500 kV ultra-high voltage transmission line and the study of lightning protection strategy of double-circuit transmission line with the same tower.
【學(xué)位授予單位】：華北電力大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM863

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