本文關(guān)鍵詞：特高壓交流系統(tǒng)過電壓若干問題研究　出處：《浙江大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 特高壓 單相接地故障過電壓 限制方法 特快速暫態(tài)過電壓 VFTO波前陡度 架空線 特高壓GIS變電站 特高壓發(fā)電廠

【摘要】：從2009年第一條特高壓?jiǎn)位亟涣鬏旊娋�路成功投入運(yùn)行至今以來,我國(guó)在特高壓交流輸電方面的運(yùn)行經(jīng)驗(yàn)越來越豐富。但是,特高壓交流系統(tǒng)仍存在部分過電壓的相關(guān)問題,尤其是針對(duì)遠(yuǎn)距離的特高壓交流輸電線路。本文主要對(duì)特高壓交流系統(tǒng)單相接地故障過電壓和特快速暫態(tài)過電壓的相關(guān)問題開展研究。 對(duì)于特高壓交流長(zhǎng)距離輸電線路,單相接地故障過電壓不容忽視。本文首先基于系統(tǒng)電源阻抗特性對(duì)該過電壓的影響規(guī)律,提出了綜合考慮該過電壓的各影響因素后求取該過電壓最大值的方法。在此基礎(chǔ)之上,對(duì)特高壓交流長(zhǎng)距離輸電線路的單相接地故障過電壓的限制方法進(jìn)行了探討,結(jié)果表明采用MOA和高抗聯(lián)合限制該過電壓的措施是一種技術(shù)上可行、經(jīng)濟(jì)上占優(yōu)的方法。其次,應(yīng)用該限制過電壓的方法,在保證整條線路沿線過電壓不超過限制水平的前提下,對(duì)分3-5段的長(zhǎng)距離輸電線路合理的分段方式進(jìn)行了研究。結(jié)果表明,對(duì)于分3-5段的線路,整條線路總長(zhǎng)度分別不超過1300km、1400km和1600km時(shí),過電壓不會(huì)超過限制水平,且單段線路的最大長(zhǎng)度分別可達(dá)500km、400km和400km。 陡波前、高幅值的VFTO會(huì)對(duì)特高壓GIS系統(tǒng)中GIS設(shè)備和變壓器構(gòu)成威脅。本文首先通過試驗(yàn)和仿真就架設(shè)于GIS出線套管與主變出線套管之間的架空線對(duì)入侵特高壓變壓器的VFTO波前陡度的限制效果進(jìn)行了研究,探究了該段架空線長(zhǎng)度與入侵主變的VFTO波前陡度之間的定量關(guān)系。結(jié)果表明,10-25m長(zhǎng)的架空線能夠很好的保護(hù)主變縱絕緣：當(dāng)架空線長(zhǎng)度在10m左右時(shí),架空線能夠非常明顯的削弱到達(dá)主變端口的VFTO波前陡度；當(dāng)架空線長(zhǎng)度達(dá)到25m時(shí),對(duì)于一般的特高壓GIS變電站以及發(fā)電廠,到達(dá)變壓器的VFTO波前陡度不會(huì)超出限制水平。此外,對(duì)比了特高壓GIS變電站與特高壓發(fā)電廠中VFTO特性的差異,可為工程實(shí)踐提供借鑒。
[Abstract]:Since the first UHV single circuit AC transmission line was successfully put into operation in 2009, our country has more and more experience in UHV AC transmission. Some overvoltage problems still exist in UHV AC system. Especially for long-distance UHV AC transmission lines, this paper mainly studies the overvoltage of single-phase grounding fault and the ultra-fast transient overvoltage of UHV AC system. For UHV AC long distance transmission lines, the over-voltage of single-phase grounding fault can not be ignored. Firstly, based on the influence of the system power impedance characteristics on the over-voltage. A method for finding the maximum value of the overvoltage is proposed after considering all the influencing factors of the overvoltage. The method of limiting the over-voltage of single-phase grounding fault in UHV AC long distance transmission line is discussed. The results show that the method of combining MOA with high resistance to limit the over-voltage is technically feasible. Secondly, the method of limiting overvoltage is applied to ensure that the overvoltage along the whole line does not exceed the limit level. The reasonable segmental mode of long distance transmission lines with 3-5 segments is studied. The results show that the total length of the whole transmission line is not more than 1300 km for the line with 3-5 segment. At 1400km and 1600km, the overvoltage will not exceed the limit level, and the maximum length of the single section of the line can be up to 500km2 400km and 400km, respectively. Steep front. High amplitude VFTO will pose a threat to GIS equipment and transformer in UHV GIS system. In this paper, the overhead line between GIS outlet bushing and main transformer output bushing is first put up by test and simulation. The effect of limiting VFTO wavefront steepness of UHV transformer is studied. The quantitative relationship between the length of the overhead line and the VFTO wavefront steepness of the main intrusion transformer is investigated. The overhead wire with 10-25m length can protect the longitudinal insulation of the main transformer well: when the length of the overhead line is about 10m, the overhead wire can obviously weaken the VFTO wavefront steepness to the main transformer port; For general UHV GIS substations and power plants, when the length of overhead line reaches 25m, the front gradient of VFTO to the transformer will not exceed the limit level. The differences of VFTO characteristics between UHV GIS substations and UHV power plants are compared, which can be used for reference in engineering practice.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM862

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