本文選題：直流輸電 + 單極運(yùn)行　； 參考：《華北電力大學(xué)》2014年碩士論文

【摘要】：特高壓直流輸電具有“大容量、遠(yuǎn)距離”輸電的優(yōu)點(diǎn),依托特高壓直流輸電,構(gòu)建西部大型能源基地外送通道,能有效緩解我國能源資源與負(fù)荷中心逆向分布的矛盾,促進(jìn)國家霧霾治理、節(jié)能減排可持續(xù)發(fā)展戰(zhàn)略的實(shí)現(xiàn)。然而,特高壓直流輸電單極運(yùn)行時(shí)產(chǎn)生的地電流會引發(fā)變壓器直流偏磁,此時(shí)變壓器鐵芯高度磁飽和,漏磁增加,變壓器會出現(xiàn)振動加劇、噪音增大、局部過熱、諧波激增等現(xiàn)象,影響變壓器的安全穩(wěn)定運(yùn)行。因此,特高壓直流輸電引起變壓器直流偏磁及其抑制措施方面的研究,具有重要的理論意義和重大的工程實(shí)用價(jià)值。本文以錦屏～蘇南±800kV特高壓直流輸電工程為背景,圍繞直流偏磁電流的產(chǎn)生、變壓器直流偏磁的機(jī)理及影響和變壓器中性點(diǎn)串接小電阻抑制直流偏磁展開研究。 本文根據(jù)蘇州電網(wǎng)結(jié)構(gòu)參數(shù)建立了電網(wǎng)拓?fù)淠Ｐ?根據(jù)蘇州地區(qū)的地質(zhì)情況建立了土壤分層模型,采用電力系統(tǒng)接地分析軟件CDEGS對蘇州換流站單極大地回線運(yùn)行方式下附近變電站地電位和直流分布情況進(jìn)行了計(jì)算分析。 本文從變壓器的理論模型出發(fā),研究分析了變壓器直流偏磁情況下勵(lì)磁電流和諧波分量的變化情況。結(jié)合錦屏～蘇南±800kV特高壓直流輸電工程單極運(yùn)行調(diào)試,分析了直流偏磁對蘇州電網(wǎng)部分變電站變壓器的影響。 本文分析了幾種常見的直流偏磁抑制方法,并針對蘇州電網(wǎng)直流偏磁情況提出了變壓器中性點(diǎn)串接小電阻抑制直流偏磁的方案,對500kV木瀆變主變中性點(diǎn)串接小電阻抑制直流偏磁的的方案進(jìn)行了可行性研究,對應(yīng)用效果進(jìn)行了評估。
[Abstract]:UHV DC transmission has the advantages of "large capacity, long distance" transmission. Relying on UHVDC transmission, the construction of the western large energy base external transmission channel can effectively alleviate the contradiction between the reverse distribution of energy resources and load center in China. Promote national haze governance, energy conservation and emission reduction sustainable development strategy to achieve. However, the earth current generated by the unipolar operation of UHVDC transmission will lead to DC bias of transformer. At this time, the transformer core is highly magnetically saturated, the leakage of magnetic flux increases, the vibration of the transformer increases, the noise increases, and the local overheating occurs. Harmonic surge and other phenomena affect the safe and stable operation of transformers. Therefore, the research on DC bias of transformer caused by UHVDC transmission and its suppression measures has important theoretical significance and great engineering practical value. With the background of Jinping ~ Sunan 鹵800kV UHV HVDC transmission project, this paper studies the generation of DC bias current, the mechanism and influence of transformer DC bias, and the suppression of DC bias by series small resistance of transformer neutral point. According to the structural parameters of Suzhou power network, the topology model of power network is established in this paper, and the soil stratification model is established according to the geological conditions in Suzhou area. The ground potential and DC distribution of substations in Suzhou converter station under the operation mode of unipolar earth loop are calculated and analyzed by using the power system grounding analysis software CDEGS. Based on the theoretical model of transformer, the variation of excitation current and harmonic component under DC bias of transformer is studied and analyzed in this paper. Combined with unipolar operation debugging of Jinping ~ Sunan 鹵800kV UHVDC transmission project, the influence of DC bias on transformer in some substations of Suzhou power network is analyzed. In this paper, several common methods of DC bias suppression are analyzed, and a scheme of transformer neutral-point series connection with small resistance to suppress DC bias is put forward in view of the DC bias of Suzhou power network. In this paper, the feasibility of the scheme of 500kV Mudu main transformer series connected with small resistance to restrain DC bias magnetic field is studied, and the application effect is evaluated.
【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】：2014
【分類號】：TM712

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本文編號：1781391