【摘要】：在電力系統(tǒng)運(yùn)行中,架空線是連接各個變電站和重要用戶之間必不可少的基礎(chǔ)設(shè)施。雷電襲擊架空線引發(fā)線路上電壓迅速升高從而產(chǎn)生雷電過電壓,導(dǎo)致了跳閘事故的發(fā)生,嚴(yán)重影響電力系統(tǒng)的安全可靠運(yùn)行。因此建立更加有效準(zhǔn)確的架空線端口模型,不僅能夠在電磁暫態(tài)計算中廣泛的應(yīng)用,也能更進(jìn)一步研究輸電線路的防雷保護(hù)。本文基于分?jǐn)?shù)階微積分理論,綜合考慮導(dǎo)線本身及土壤電參數(shù)的頻變特性,建立更為準(zhǔn)確、有效且簡潔的架空線端口分?jǐn)?shù)階模型,并對其數(shù)值計算方法進(jìn)行深入研究。首先,使用分?jǐn)?shù)階矢量匹配技術(shù)對架空線的特征阻抗進(jìn)行擬合,基于遞歸卷積法得到了等值電流源的時域模型,建立考慮頻變特性架空線端口分?jǐn)?shù)階模型。其次,針對所提架空線端口分?jǐn)?shù)階模型,采用分?jǐn)?shù)階對應(yīng)的差分方法,得到了適用于所提分?jǐn)?shù)階模型的數(shù)值計算方法,基于相模變換理論,分別對各個模量的特征阻抗使用分?jǐn)?shù)階矢量匹配擬合,實現(xiàn)了三相架空線端口雷電過電壓的計算,并通過MATLAB語言和EMTP-ATP軟件驗證了本文所提模型和算法的準(zhǔn)確性和有效性。最后結(jié)合桿塔數(shù)值計算模型,計算了220kV同塔雙回架空輸電線路的雷電過電壓。
[Abstract]:In the operation of power system, overhead line is the essential infrastructure between substation and important users. Lightning attacks on overhead lines lead to a rapid rise in the voltage on the line, resulting in lightning overvoltage, resulting in tripping accidents, which seriously affect the safe and reliable operation of the power system. Therefore, the establishment of a more effective and accurate model of overhead line ports can not only be widely used in electromagnetic transient calculation, but also can further study the lightning protection of transmission lines. Based on fractional calculus theory and considering the frequency variation characteristics of conductors and soil electrical parameters, a more accurate, effective and succinct fractional order model of overhead line ports is established in this paper, and its numerical calculation method is deeply studied. Firstly, the fractional vector matching technique is used to fit the characteristic impedance of overhead line. Based on the recursive convolution method, the time domain model of equivalent current source is obtained, and the fractional order model of overhead line port considering frequency variation is established. Secondly, according to the proposed fractional order model of overhead line port, a numerical calculation method suitable for the proposed fractional order model is obtained by using the fractional order corresponding difference method, which is based on the phase mode transformation theory. The characteristic impedance of each modulus is fitted by fractional vector matching to realize the calculation of lightning overvoltage at the three-phase overhead line port. The accuracy and validity of the proposed model and algorithm are verified by MATLAB and EMTP-ATP software. Finally, the lightning overvoltage of 220kV double-circuit overhead transmission line with the same tower is calculated based on the numerical calculation model of the 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】：2017
【分類號】：TM75;TM863

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 申文;劉亞東;盛戈v，

本文編號：2165022