本文關(guān)鍵詞： 特高壓 分布電容電流 電流差動保護(hù) 時域補(bǔ)償 自適應(yīng)　出處：《廣西大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：1000kV特高壓交流輸電線路在實(shí)現(xiàn)電力資源的優(yōu)化配置,推動電力科技自主創(chuàng)新和新能源的高效率開發(fā),促進(jìn)居住環(huán)境的可持續(xù)發(fā)展等方面具有重要的作用。然而特高壓交流輸電線路上巨大的分布電容電流對分相電流縱聯(lián)差動保護(hù)產(chǎn)生嚴(yán)重的影響,使其靈敏性和安全性不能滿足特高壓線路保護(hù)的要求。因此,對這一問題進(jìn)行深入和詳細(xì)的研究,并提出解決該問題的方法具有一定實(shí)踐意義。首先,本文詳細(xì)分析了特高壓交流輸電線路的物理特征和數(shù)學(xué)模型、線路保護(hù)的配置及原則、分布電容電流的數(shù)學(xué)計(jì)算公式,并建立了1000kV特高壓交流輸電線路的PSCAD/EMTDC模型,仿真研究了不同電壓等級的分布電容電流大小。其次,理論分析了特高壓輸電線路巨大的分布電容電流對全電流縱聯(lián)差動保護(hù)、故障分量電流縱聯(lián)差動保護(hù)和零序電流差動保護(hù)的影響,同時建立了三種保護(hù)的EMTDC仿真模型,分別仿真研究了線路保護(hù)在不同故障地點(diǎn)、不同過渡電阻、不同電源相角差以及不同合閘等情況下受分布電容電流影響情況。最后,針對分布電容電流對電流差動保護(hù)產(chǎn)生嚴(yán)重影響的問題,分析對比了高壓并聯(lián)電抗器補(bǔ)償法、相量補(bǔ)償法和時域補(bǔ)償法的優(yōu)缺點(diǎn),并對其存在的補(bǔ)償誤差大的問題,本文提出了自適應(yīng)時域補(bǔ)償方法并進(jìn)行了理論分析。通過EMTDC仿真研究表明,該方法能夠很好地提高補(bǔ)償精度和電流差動保護(hù)的靈敏度。
[Abstract]:1000kV UHV AC transmission lines are realizing the optimal allocation of power resources and promoting the independent innovation of power science and technology and the high efficiency development of new energy sources. Promoting the sustainable development of living environment plays an important role. However, the huge distributed capacitance current on UHV AC transmission lines has a serious impact on the differential protection of phase separation current. So that the sensitivity and safety can not meet the requirements of UHV line protection. Therefore, it is of certain practical significance to study this problem in depth and in detail, and to put forward the method to solve the problem. In this paper, the physical characteristics and mathematical model of UHV AC transmission line, the configuration and principle of line protection, and the mathematical calculation formula of distributed capacitance current are analyzed in detail. The PSCAD/EMTDC model of 1000kV UHV AC transmission line is established and the distributed capacitance current of different voltage levels is simulated. Secondly. The influence of the huge distributed capacitance current on the full-current longitudinal differential protection, the fault component current longitudinal differential protection and the zero-sequence current differential protection is theoretically analyzed. At the same time, the EMTDC simulation models of three kinds of protection are established, and the line protection in different fault locations and different transition resistance are simulated and studied respectively. Different power source phase angle difference and different switching conditions are affected by the distributed capacitance current. Finally, the distributed capacitance current has a serious impact on the current differential protection. The advantages and disadvantages of high voltage parallel reactor compensation method, phasor compensation method and time domain compensation method are analyzed and compared. In this paper, an adaptive time-domain compensation method is proposed and its theoretical analysis is carried out. The EMTDC simulation results show that the proposed method can improve the compensation accuracy and the sensitivity of the current differential protection.
【學(xué)位授予單位】：廣西大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM773

【參考文獻(xiàn)】

相關(guān)期刊論文 前1條

1 薛士敏;賀家李;李永麗;;特高壓輸電線路負(fù)序方向縱聯(lián)保護(hù)[J];電力系統(tǒng)自動化;2007年18期

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本文編號：1489454