【摘要】：同桿多回線具有輸電走廊窄、占地面積小、節(jié)省投資、建設(shè)速度快等優(yōu)點(diǎn),在我國(guó)受到了越來越多的應(yīng)用。而隨著電網(wǎng)規(guī)模的不斷擴(kuò)大,單向重合閘等設(shè)備的應(yīng)用,復(fù)雜故障發(fā)生的概率也越來越高。二相回路法能夠解耦線路,使得故障計(jì)算更加簡(jiǎn)單,所以針對(duì)同桿多回線復(fù)雜故障計(jì)算的二相回路法研究具有現(xiàn)實(shí)意義。二相回路法目前只被應(yīng)用于解耦同桿雙回線,計(jì)算同桿雙回線簡(jiǎn)單故障,所以研究同桿多回線復(fù)雜故障計(jì)算的二相回路法十分必要。本文首先介紹了二相回路法的原理,對(duì)其解耦同桿雙回線形成獨(dú)立回路的過程進(jìn)行了分析,進(jìn)而將二相回路法進(jìn)行改進(jìn),得到了改進(jìn)后的各序二相回路分量和二相回路,將其推廣到了同桿多回線中,使它能夠解耦同桿多回線路,并且列出了利用改進(jìn)的二相回路法計(jì)算同桿多回線簡(jiǎn)單故障的步驟。然后本文對(duì)兩端口網(wǎng)絡(luò)法的原理進(jìn)行了介紹,將改進(jìn)后的二相回路法與兩端口網(wǎng)絡(luò)法結(jié)合,得到了二相回路坐標(biāo)下的兩端口網(wǎng)絡(luò)法,接著進(jìn)行深入分析,將其推廣到了多端口網(wǎng)絡(luò)法中,列出各故障端口電壓方程,得到了二相回路坐標(biāo)下的多端口網(wǎng)絡(luò)法。隨后列出了利用二相回路法計(jì)算同桿多回線復(fù)雜故障的步驟,使其能夠計(jì)算同桿多回線任意重?cái)?shù)的復(fù)雜故障,這樣也就得到了同桿多回線復(fù)雜故障計(jì)算的二相回路法的原理。最后本文建立了一個(gè)同桿三回線輸電系統(tǒng),在PSCAD/EMTDC中搭建模型,對(duì)一個(gè)具體的同桿三回線雙重故障列出了利用改進(jìn)的二相回路法計(jì)算和通過PSCAD/EMTDC仿真分析的過程,并且改變了線路參數(shù),綜合比較了三種線路參數(shù)下多種同桿三回線雙重故障的算例數(shù)據(jù),證明了本文同桿多回線復(fù)雜故障計(jì)算的二相回路法的研究是正確的。
[Abstract]:With the advantages of narrow transmission corridor, small area, low investment and fast construction speed, the same pole multi-circuit line has been applied more and more in our country. With the expansion of power grid and the application of unidirectional reclosure, the probability of complex faults is higher and higher. The two-phase circuit method can decouple the circuit and make the fault calculation simpler, so it is of practical significance to study the two-phase loop method for the complex fault calculation of the same rod multi-circuit line. The two-phase loop method is only used to decouple the double-circuit line of the same rod and calculate the simple fault of the double-circuit line of the same rod, so it is necessary to study the two-phase loop method for the complex fault calculation of the multi-circuit line of the same rod. In this paper, the principle of the two-phase loop method is introduced, and the process of forming an independent loop by decoupling the double-loop of the same rod is analyzed. Then, the two-phase loop method is improved, and the components and the two-phase loop of the improved two-phase loop are obtained. The method is extended to the same pole multicircuit line, which can decouple the same pole multicircuit line, and the steps of calculating the simple fault of the same pole multicircuit line by using the improved two-phase loop method are listed. Then, this paper introduces the principle of two-port network method, combines the improved two-phase loop method with two-port network method, and obtains the two-port network method under the two-phase loop coordinate, then carries on the thorough analysis. It is extended to the multi-port network method, and the voltage equations of each fault port are listed, and the multi-port network method under the two-phase loop coordinates is obtained. Then the steps of calculating the complex faults of the same rod multicircuit line by using the two-phase loop method are listed, so that it can calculate the complex faults with arbitrary multiplicity of the same rod multi-circuit line, and the principle of the two-phase circuit method for the calculation of the complex faults of the same rod multi-circuit line is obtained. Finally, this paper establishes a three-circuit transmission system with the same rod, builds a model in PSCAD/EMTDC, and lists the process of calculating and analyzing by using the improved two-phase loop method and PSCAD/EMTDC simulation analysis for a specific double fault of the same three-circuit line. And the line parameters are changed, and the calculation data of multiple double faults of the same rod three-circuit line under three kinds of line parameters are compared synthetically. It is proved that the two-phase loop method for the complex fault calculation of the same rod multi-circuit line in this paper is correct.
【學(xué)位授予單位】：鄭州大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TM75

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相關(guān)期刊論文 前10條

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本文編號(hào)：2168290