本文選題：沖擊電暈 + 輸電線路　； 參考：《北京交通大學(xué)》2014年碩士論文

【摘要】：輸電線路的可靠運(yùn)行是輸電線路運(yùn)行過程中需要考慮的重要因素,而造成輸電線路故障的主要原因是雷擊。它除了可以導(dǎo)致輸電線路故障,造成損失之外,雷電侵入波將會(huì)對變電站電氣設(shè)備造成危害。因此建立準(zhǔn)確的輸電線路仿真計(jì)算模型對研究線路耐雷性能、變電站雷電侵入波過電壓防護(hù)及其采取有效的防雷保護(hù)措施具有重要的學(xué)術(shù)意義和工程實(shí)用價(jià)值。 雷電過電壓波在輸電線路上傳播的過程中發(fā)生衰減和變形,主要原因是受到?jīng)_擊電暈和由于集膚效應(yīng)引起的參數(shù)隨頻率變化特性的影響。本文在分析參考大量文獻(xiàn)的基礎(chǔ)上,對沖擊電暈的伏庫特性和頻率參數(shù)進(jìn)行建模分析。文中采用分段擬合的方法,用壓控型動(dòng)態(tài)電容來近似表征沖擊電暈特性。對于參數(shù)頻變特性,采用若干個(gè)由電阻和電感組成的二端口來擬合,無需進(jìn)行頻域和時(shí)域的相互轉(zhuǎn)換,可較大幅度地簡化了計(jì)算�；赑SCAD軟件,分別建立更加準(zhǔn)確的沖擊電暈和頻率參數(shù)的仿真模型,此外,還在軟件中建立輸電桿塔模型、絕緣子仿真模型、接地電阻模型以及過電壓侵入變電站的模型。 文本利用在軟件中建立的整體的仿真模型,以雙指數(shù)標(biāo)準(zhǔn)雷電波和衰減振蕩波為基礎(chǔ),分別仿真在考慮沖擊電暈和頻率參數(shù)下和不考慮兩者因素下的波形,并進(jìn)行對比；計(jì)算不同影響因素下的耐雷水平,并探究影響系統(tǒng)耐雷水平的因素。衰減振蕩雷電波下的仿真波形與已有文獻(xiàn)中試驗(yàn)數(shù)據(jù)對比以驗(yàn)證其正確性。
[Abstract]:The reliable operation of transmission line is an important factor to be considered in the course of transmission line operation, and the main cause of transmission line fault is lightning strike. In addition to the failure of transmission line and the damage caused by lightning, the lightning intrusion wave will cause harm to substation electrical equipment. Therefore, it is of great academic significance and practical value to establish an accurate simulation calculation model of transmission lines for studying the lightning resistance performance of transmission lines, protecting the over-voltage of lightning intrusive waves in substations and taking effective lightning protection measures. The attenuation and deformation of lightning overvoltage wave in the transmission line are mainly due to the effect of shock corona and the variation of parameters with frequency due to skin effect. Based on the analysis of a large number of references, the characteristics and frequency parameters of the shock corona are modeled and analyzed in this paper. In this paper, the method of piecewise fitting is used to approximate the characteristics of shock corona by using voltage-controlled dynamic capacitance. For the frequency change characteristics of the parameters, several two-ports composed of resistors and inductors are used to fit the parameters, and the calculation can be greatly simplified without the need for the interconversion between frequency domain and time domain. Based on PSCAD software, more accurate simulation models of impulse corona and frequency parameters are established respectively. In addition, transmission tower model, insulator simulation model, grounding resistance model and overvoltage intrusive substation model are also established in the software. Using the whole simulation model established in the software, based on the double exponential standard lightning wave and attenuated oscillation wave, the paper simulates the waveform under the consideration of shock corona and frequency parameters and does not consider the two factors, and compares them. Calculate the lightning resistance level under different influence factors, and explore the factors that affect the lightning resistance level of the system. The simulation waveform under attenuated and oscillating lightning wave is compared with the experimental data in previous literatures to verify its correctness.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM862

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