【摘要】：論文針對(duì)對(duì)稱雙芯移相變壓器以及混合式有載分接開關(guān),從移相變壓器對(duì)有載分接開關(guān)的外圍技術(shù)參數(shù)要求和混合式有載分接開關(guān)內(nèi)晶閘管無源觸發(fā)熄弧原理及工作過程開展了新型混合式有載分接開關(guān)在移相變壓器中應(yīng)用的關(guān)鍵問題研究。本文的主要工作和創(chuàng)新成果如下:1、提出了雙芯移相變壓器等效電路模型,研究了雙芯移相變壓器在不同運(yùn)行工況(超前、滯后運(yùn)行方式、不同負(fù)載電流、不同負(fù)載電壓與負(fù)載電流的相角差)下的運(yùn)行特性。該模型的建立以及不同工況下運(yùn)行特性的分析對(duì)有載分接開關(guān)最大級(jí)電壓的計(jì)算、移相變壓器的研發(fā)設(shè)計(jì)及制定相應(yīng)的調(diào)控潮流策略等有重要的指導(dǎo)意義。2、提出了雙芯移相變壓器有載分接開關(guān)最大級(jí)電壓計(jì)算方法,并依據(jù)實(shí)例通過與MATLAB/SIMULINK仿真模型的計(jì)算結(jié)果對(duì)比,驗(yàn)證了所提最大級(jí)電壓計(jì)算方法的可行性和準(zhǔn)確性。該方法不依賴于系統(tǒng)潮流計(jì)算的結(jié)果,避免了復(fù)雜的電網(wǎng)潮流分析,沒有因?yàn)閺?fù)雜的負(fù)荷變化增加計(jì)算難度,便于相關(guān)工程設(shè)計(jì)人員的使用,彌補(bǔ)了現(xiàn)有方法繁瑣、不可靠的缺點(diǎn)。3、對(duì)混合式有載分接開關(guān)晶閘管無源觸發(fā)熄弧原理及切換開關(guān)工作過程進(jìn)行了仿真和試驗(yàn)研究。研究表明:(1)混合式有載分接開關(guān)中晶閘管輔助熄弧效果顯著、可靠性高,滿足移相變壓器對(duì)開關(guān)工作性能的要求;(2)當(dāng)開斷電流在過零點(diǎn)附近時(shí),晶閘管存在不能成功觸發(fā)的情況,但并不影響開關(guān)的開斷性能;(3)在晶閘管導(dǎo)通后電流過零自然關(guān)斷時(shí)會(huì)形成過沖電壓,通過加裝氧化鋅避雷器的防護(hù)措施可以有效抑制過沖電壓的形成,形成對(duì)晶閘管的可靠保護(hù)。
[Abstract]:In this paper, a symmetrical dual-core phase-shifting transformer and a hybrid on-load tap switch are introduced. Based on the peripheral technical parameters of the on-load tap switch of the phase-shift transformer and the principle and working process of the thyristor passive trigger extinguishing arc in the hybrid on-load tap switch, a new type of hybrid on-load tap switch is developed in the phase shift transformer. Research on the key problems of application. The main work and innovative achievements of this paper are as follows: 1. The equivalent circuit model of dual core phase shift transformer is proposed, and the dual core phase shift transformer is studied in different operating conditions (lead, lag operation mode, different load current). Operating characteristics under different load voltage and load current phase angle difference. The establishment of the model and the analysis of the operating characteristics under different operating conditions are of great significance for the calculation of the maximum stage voltage of the on-load tap switch, the R & D design of the phase-shift transformer and the formulation of the corresponding power flow control strategy. A method for calculating the maximum voltage of the loaded tap switch of a dual-core phase-shift transformer is proposed. The feasibility and accuracy of the proposed method are verified by comparing the calculation results with the MATLAB/SIMULINK simulation model. The method does not depend on the result of the system power flow calculation, avoids the complex power flow analysis, does not increase the calculation difficulty because of the complex load change, is convenient for the related engineering designer to use, and makes up for the existing method to be tedious. Third, the principle of passive trigger quenching of thyristor with hybrid on-load tap switch and the working process of switching switch are simulated and tested. The results show that: (1) the thyristor auxiliary arc extinguishing effect is remarkable and the reliability is high in the hybrid on-load tap switch, which meets the requirements of the switching performance of the phase-shifting transformer; (2) when the on-off current is near the zero crossing point, the thyristor can not be triggered successfully, but it does not affect the switching performance; (3) overshoot voltage will be formed when the current is turned off naturally after the thyristor is switched on. The overshoot voltage can be effectively restrained by adding zinc oxide arrester and the reliable protection of thyristor can be formed.
【學(xué)位授予單位】：華北電力大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TM41

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本文編號(hào)：2361958