發(fā)布時(shí)間：2018-03-16 03:25

  本文選題：特高壓　切入點(diǎn)：空載線路　出處：《廣西大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：特高壓輸電線路由于其參數(shù)、系統(tǒng)容量等特點(diǎn)使得其過電壓比超高壓線路更加嚴(yán)重。另外,其絕緣子等設(shè)備能夠承受的過電壓水平較低,易造成絕緣子的擊穿或設(shè)備損壞,給電力系統(tǒng)造成巨大的經(jīng)濟(jì)損失。故開展特高壓輸電系統(tǒng)過電壓的研究,采用有效措施,降低系統(tǒng)的過電壓水平將是構(gòu)建1000kV特高壓電網(wǎng)的重要課題之一。 本文以我國首條1000kV特高壓交流輸電線路為背景,從理論上分析了特高壓輸電線路在空載狀態(tài)下合閘操作過電壓的產(chǎn)生機(jī)理、影響合閘過電壓倍數(shù)的各種因素及常用的限壓措施。通過建立輸電線路的等效模型,并采用改進(jìn)歐拉法對(duì)合閘過電壓進(jìn)行數(shù)值計(jì)算,具體的求解計(jì)算過程借助VB6.0軟件編程完成,得出過電壓倍數(shù)。最后通過電磁暫態(tài)分析程序EMTP對(duì)合閘過電壓進(jìn)行仿真分析,以驗(yàn)證數(shù)值計(jì)算在思路、推導(dǎo)、求解等過程中的正確性與可行性。 結(jié)果表明,在電源電壓為峰值時(shí)進(jìn)行合閘,過電壓倍數(shù)高達(dá)2.5倍；在線路殘壓最大且極性相反時(shí)合閘,過電壓倍數(shù)高達(dá)2.6倍；三相不同期合閘時(shí),過電壓倍數(shù)達(dá)到3倍以上。另外,在線路中部安裝補(bǔ)償度約為20%-40%的串聯(lián)補(bǔ)償電容器、在線路首末兩端均安裝補(bǔ)償度約80%以上的并聯(lián)電抗器、在斷路器上安裝兩級(jí)并聯(lián)電阻、沿線安裝避雷器等措施均可使合閘過電壓倍數(shù)降低,達(dá)到特高壓輸電線路對(duì)過電壓倍數(shù)的要求。 本文成果進(jìn)一步豐富了特高壓輸電線路空載合閘過電壓的基礎(chǔ)理論和分析方法,對(duì)特高壓輸電技術(shù)領(lǐng)域的科學(xué)研究與工程設(shè)計(jì)具有重要意義。
[Abstract]:UHV transmission line because of its parameters, system capacity characteristics make the overvoltage is more serious than EHV line. In addition, the insulator and other equipment to withstand voltage level is low, easy to cause insulator breakdown or damage to the equipment, causing huge economic losses to the power system. Therefore, to carry out research on UHV transmission system. The voltage, the effective measures to reduce the voltage level of the system will be one of the important tasks of constructing the 1000kV UHV power grid.
Based on the background of China's first UHV AC transmission line 1000kV, from the theoretical analysis of the UHV transmission line in the state of no-load closing operation over-voltage generation mechanism, pressure measure of various factors affecting the switching overvoltage multiples and common limit. By establishing the equivalent model of transmission line, and by using the improved Euler numerical the calculation of the switching overvoltage, the specific calculation process using VB6.0 software programming, the overvoltage. The electromagnetic transient analysis program EMTP for switching overvoltage simulation analysis is carried out to verify the numerical calculation in ideas, derivation, feasibility and correctness of the solving process.
The results show that the closing of the supply voltage is peak, overvoltage multiples of up to 2.5 times; in the closing line and maximum residual voltage of opposite polarity, voltage ratio as high as 2.6 times; three phase switching overvoltage, reached more than 3 times. In addition, the central line is about compensation installation the series compensation capacitor 20%-40%, compensation degree and more than 80% shunt reactors are installed on the line ends, install two level shunt resistance on the circuit breaker, arrester installed along with other measures can make the switching overvoltage ratio decreased, reaching on UHV transmission line overvoltage requirements.
The results of this paper further enrich the basic theory and analysis method of over voltage of no load switching on UHV transmission lines, which is of great significance for the scientific research and engineering design of UHV transmission technology.

【學(xué)位授予單位】：廣西大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM723

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本文編號(hào)：1618133