本文選題：GIS + 特快速暫態(tài)過(guò)電壓��； 參考：《西安科技大學(xué)》2017年碩士論文

【摘要】：近年來(lái),我國(guó)大力推動(dòng)特高壓輸電工程的建設(shè),并已成功建設(shè)和運(yùn)行了一批特高壓交流和直流輸電工程。隨著特高壓輸電技術(shù)的發(fā)展,全封閉氣體絕緣變電站(Gas Insu1ated Substation,GIS)得到了廣泛的應(yīng)用,然而GIS變電站中的過(guò)電壓對(duì)GIS設(shè)備絕緣水平的選擇和系統(tǒng)安全可靠運(yùn)行有著重要影響。因此,研究GIS變電站的操作過(guò)電壓以及雷電過(guò)電壓具有十分重要的意義。本文以某1100kVGIS變電站一期主接線為研究對(duì)象對(duì)特快速暫態(tài)過(guò)電壓(VFTO)和雷電入侵波過(guò)電壓進(jìn)行了計(jì)算分析。首先,分析了 GIS中主要元件設(shè)備計(jì)算模型的建立方法以及參數(shù)的計(jì)算選取方法,基于ATP-EMTP建立了該1100kV GIS變電站的VFTO等效仿真計(jì)算模型,研究了該GIS變電站在隔離開(kāi)關(guān)不同操作方式下所產(chǎn)生的VFTO,包括幅值和頻域特性等,然后,分析了抑制VFTO的多種典型措施。最后,根據(jù)雷電波參數(shù),建立了 GIS變電站雷電侵入波過(guò)電壓等效仿真計(jì)算模型,應(yīng)用雙指數(shù)波和斜角平頂波兩種波形模擬雷電流波,對(duì)GIS變電站的雷電侵入波過(guò)電壓的特性進(jìn)行了研究,分析了避雷器MOA對(duì)雷電過(guò)電壓防護(hù)性能方面的影響。由仿真計(jì)算結(jié)果表明:各個(gè)電氣設(shè)備測(cè)定節(jié)點(diǎn)處的VFTO在不同的操作方式下的變化程度不同;在隔離開(kāi)關(guān)合閘操作情況下所產(chǎn)生的VFTO幅值低于隔離開(kāi)關(guān)分閘操作產(chǎn)生的VFTO幅值,在分閘情況下頻率振蕩分量更高;距離隔離開(kāi)關(guān)操作點(diǎn)越近,相應(yīng)的測(cè)定節(jié)點(diǎn)的VFTO幅值和頻率也越大;裝設(shè)避雷器(MOA)、分合閘電阻、鐵氧體磁環(huán)對(duì)VFTO均有一定程度的抑制作用,但這些抑制措施互有優(yōu)缺點(diǎn);采用等值斜角波模擬雷電流得到的最大過(guò)電壓值比采用雙指數(shù)波模擬得到的值要偏大,但是考慮輸電線路和桿塔因素時(shí),最大過(guò)電壓值卻較為接近;避雷器MOA對(duì)GIS各個(gè)設(shè)備上的雷電過(guò)電壓都有較好的防護(hù)性能。
[Abstract]:In recent years, China has vigorously promoted the construction of UHV transmission projects, and has successfully constructed and operated a number of UHV AC and DC transmission projects. With the development of UHV transmission technology, Gas Insu1ated Substation (GIs) has been widely used in fully enclosed gas insulated substations. However, the overvoltage in GIS substation has an important influence on the selection of insulation level of GIS equipment and the safe and reliable operation of the system. Therefore, it is of great significance to study the operating overvoltage and lightning overvoltage of GIS substation. In this paper, the transient overvoltage (VFTO) and the lightning intrusion wave overvoltage of a 1100kVGIS substation are calculated and analyzed. Firstly, the method of setting up the calculation model of the main components and equipment and the method of selecting the parameters in GIS are analyzed. Based on ATP-EMTP, the VFTO equivalent simulation model of the 1100kV GIS substation is established. In this paper, the VFTO produced by the GIS substation under different operation modes of the disconnector is studied, including amplitude and frequency domain characteristics, etc. Then, several typical measures to suppress VFTO are analyzed. Finally, according to the lightning wave parameters, the equivalent simulation model of lightning invading wave overvoltage in GIS substation is established. Two kinds of waveforms, double exponent wave and inclined flat-top wave, are used to simulate the lightning current wave. The characteristics of lightning intrusion wave overvoltage in GIS substation are studied, and the influence of lightning arrester MOA on the protection performance of lightning overvoltage is analyzed. The simulation results show that the variation of VFTO at each electrical device is different under different operation modes, and the amplitude of VFTO generated under the condition of switching off is lower than that of VFTO produced by switch opening operation. The higher the frequency oscillation component is when the switch is open, the greater the VFTO amplitude and frequency of the corresponding measured node are, the closer to the operating point of the isolator switch, the greater the VFTO amplitude and frequency of the corresponding measuring node. The installation of the arrester, the closing resistance and the ferrite magnetic ring can all inhibit the VFTO to a certain extent. However, these suppression measures have advantages and disadvantages, the maximum overvoltage value obtained by using equivalent diagonal wave to simulate lightning current is larger than that obtained by using double exponential wave simulation, but when the transmission line and tower factors are taken into account, The maximum overvoltage value is close but the lightning arrester MOA has better protection performance to the lightning overvoltage on each GIS equipment.
【學(xué)位授予單位】：西安科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TM63

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本文編號(hào)：1859409