【摘要】：在電力系統(tǒng)中,無(wú)功補(bǔ)償與無(wú)功平衡對(duì)于提高全網(wǎng)經(jīng)濟(jì)效益和改善供電質(zhì)量至關(guān)重要。因此,新型無(wú)功補(bǔ)償裝置的研制與應(yīng)用顯然已成為電力系統(tǒng)中的重要研究課題。近年來(lái)新型無(wú)功補(bǔ)償裝置發(fā)展迅速,種類也日益增多。電網(wǎng)中現(xiàn)有的無(wú)功補(bǔ)償裝置主要包括同步調(diào)相機(jī)、晶閘管投切電容器(TSC)、晶閘管控制電抗器(TCR)、靜止無(wú)功發(fā)生器(STATCOM)等。同步調(diào)相機(jī)由于其響應(yīng)速度慢、運(yùn)行維護(hù)困難等諸多缺點(diǎn),目前已很少使用。晶閘管投切電容器無(wú)法實(shí)現(xiàn)無(wú)功功率的連續(xù)可調(diào)。晶閘管控制電抗器響應(yīng)速度快、控制靈活,但由于晶閘管耐壓水平的局限性,使得其在高壓大容量場(chǎng)合的應(yīng)用受到了限制,并且TCR在工作過程中會(huì)產(chǎn)生大量的諧波電流,需要加裝濾波裝置。靜止無(wú)功發(fā)生器響應(yīng)速度快、控制靈活、占地面積小,但其價(jià)格昂貴、維護(hù)困難,在超(特)高壓電網(wǎng)中并沒有得到廣泛的應(yīng)用。磁閥式可控電抗器是一種通過改變控制回路直流勵(lì)磁電流的大小,進(jìn)而改變鐵心的磁飽和程度,達(dá)到平滑調(diào)節(jié)無(wú)功容量輸出的新型無(wú)功補(bǔ)償裝置。這種可控電抗器具有電壓范圍廣、響應(yīng)速度快、諧波含量低等優(yōu)點(diǎn),對(duì)于提高電網(wǎng)的輸電能力、調(diào)節(jié)電網(wǎng)電壓、補(bǔ)償無(wú)功功率以及限制操作過電壓都具有無(wú)與倫比的應(yīng)用潛力。首先,本文概述了磁閥式可控電抗器的發(fā)展歷史、研究現(xiàn)狀及其應(yīng)用前景,并簡(jiǎn)要介紹了磁閥式可控電抗器的基本結(jié)構(gòu)、工作原理和數(shù)學(xué)模型,同時(shí)指出了磁閥式可控電抗器的諸多優(yōu)點(diǎn)。其次,本文詳細(xì)給出了干式磁閥式可控電抗器的設(shè)計(jì)計(jì)算公式,推導(dǎo)了在不同飽和度下磁閥式可控電抗器工作電流的解析表達(dá)式,并利用Matlab編程仿真分析了磁閥參數(shù)對(duì)工作電流畸變率的影響。再次,本文利用Ansoft軟件建立了10kV磁閥式可控電抗器的二維有限元模型,分析了不同工況下工作繞組電流的諧波含量,并與解析法得出的各次諧波含量進(jìn)行對(duì)比,驗(yàn)證了解析法計(jì)算結(jié)果的正確性。最后,本文利用Matlab GUI工具開發(fā)了一套干式磁閥式可控電抗器的設(shè)計(jì)計(jì)算軟件。該軟件集參數(shù)設(shè)置和計(jì)算仿真于一體,軟件界面友好,并能實(shí)現(xiàn)工作電流諧波分析,設(shè)計(jì)精度滿足工程要求。本文的工作將為干式磁閥式可控電抗器的設(shè)計(jì)打下堅(jiān)實(shí)的基礎(chǔ)。
[Abstract]:In power system, reactive power compensation and reactive power balance are very important to improve the economic benefit and the quality of power supply. Therefore, the development and application of a new type of reactive power compensator has become an important research topic in power system. In recent years, the new type of reactive power compensator is developing rapidly and the variety is increasing day by day. The existing reactive power compensation devices mainly include synchronous regulator, thyristor switched capacitor, (TSC), thyristor control reactor, (TCR), static var generator, etc. Synchronous camera is rarely used because of its slow response speed, difficult operation and maintenance. Thyristor switching capacitors can not achieve continuous adjustable reactive power. Thyristor control reactor has fast response speed and flexible control. However, because of the limitation of thyristor voltage level, its application in high voltage and large capacity situation is limited, and TCR will produce a lot of harmonic current in the working process. Filter devices need to be installed. Static Var Generator (SVG) is fast in response, flexible in control and small in area, but it is expensive and difficult to maintain, so it has not been widely used in ultra-high voltage (UHV) power system. Magnetic valve controllable reactor is a new type of reactive power compensation device which can adjust the output of reactive power capacity smoothly by changing the magnitude of DC excitation current in the control circuit and then changing the magnetic saturation degree of the core. This controllable reactor has the advantages of wide voltage range, fast response speed and low harmonic content. It has unparalleled application potential for improving power transmission capacity, regulating network voltage, compensating reactive power and limiting operating overvoltage. Firstly, this paper summarizes the development history, research status and application prospect of magnetic valve controllable reactor, and briefly introduces the basic structure, working principle and mathematical model of magnetic valve controllable reactor. At the same time, the advantages of magnetic valve controlled reactor are pointed out. Secondly, the design and calculation formula of the dry magnetic valve controllable reactor is given in detail, and the analytical expression of the working current of the magnetic valve controllable reactor under different saturation is derived. The effect of magnetic valve parameters on the working current distortion rate is analyzed by Matlab programming. Thirdly, the two-dimensional finite element model of 10kV magnetic valve controllable reactor is established by using Ansoft software. The harmonic content of working winding current under different working conditions is analyzed and compared with the harmonic content obtained by analytical method. The correctness of the analytical method is verified. Finally, a design and calculation software of dry magnetic valve controlled reactor is developed by using Matlab GUI tool. The software integrates parameter setting and calculation and simulation. The interface of the software is friendly, and the harmonic analysis of working current can be realized, and the design precision can meet the requirements of engineering. The work of this paper will lay a solid foundation for the design of dry magnetic valve controlled reactor.
【學(xué)位授予單位】：山東大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TM47

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本文編號(hào)：2390513