本文選題：靜止無功發(fā)生器 + 級聯(lián)　； 參考：《北京交通大學(xué)》2014年碩士論文

【摘要】：隨著電力電子技術(shù)的發(fā)展,電力電子開關(guān)器件得到廣泛的應(yīng)用。電網(wǎng)中隨之出現(xiàn)了大量的非線性負(fù)載,無功需求也越來越大。靜止無功發(fā)生器(SVG)作為新生代的無功補(bǔ)償裝置,具有響應(yīng)速度快、損耗低、儲能元件體積小和輸出電流諧波含量低等優(yōu)點(diǎn),可以有效地補(bǔ)償無功。近些年,無功補(bǔ)償裝置朝著功能綜合、高壓大容量等方向發(fā)展。增加多種工作模式也可以使SVG實(shí)現(xiàn)多種功能。級聯(lián)是設(shè)計(jì)高壓大容量無功補(bǔ)償裝置的一個(gè)重要方法。本文以國家電網(wǎng)智能電網(wǎng)研究院中電普瑞科技有限公司,"10kV/7.2Mvar級聯(lián)H橋型SVG的研制”這一項(xiàng)目為依托,研究級聯(lián)H橋型SVG的控制策略,優(yōu)化其鏈節(jié)單元生產(chǎn)過程中的測試。 本文設(shè)計(jì)的級聯(lián)H橋型SVG的控制策略主要包括電流工作模式(實(shí)現(xiàn)無功補(bǔ)償)和電壓工作模式(實(shí)現(xiàn)防止電壓跌落)兩大部分。電流工作模式中的重點(diǎn)是有功電流無功電流的解耦控制、直流電壓的三級平衡控制。 常見的級聯(lián)H橋型SVG只具有無功補(bǔ)償一個(gè)功能。但是電網(wǎng)在實(shí)際的運(yùn)行過程中,還會遇見電壓跌落的問題。如果再設(shè)計(jì)一個(gè)裝置防止電壓跌落,必然會加大成本。本文設(shè)計(jì)的級聯(lián)H橋型SVG,添加了一個(gè)電壓工作模式,使SVG兼有無功補(bǔ)償和防止電壓跌落兩個(gè)功能,有效地解決了這個(gè)問題。 常見的SVG數(shù)學(xué)模型中,有功電流、無功電流是相互耦合的,這加大了控制的難度。本文針對這個(gè)問題,將有功電流無功電流解耦,分別控制,簡化的控制策略,收到了很好的效果。 級聯(lián)H橋型SVG中,直流電容相互獨(dú)立。這雖然簡化主電路,使其省去了移相變壓器和整流電路,但同時(shí)也帶來了電容電壓的平衡控制問題。本文,針對這一問題,設(shè)計(jì)了直流電壓的三級平衡控制的方法,使直流電壓能夠維持到期望值。 本文在MATLAB/SIMULINK仿真模型和實(shí)驗(yàn)平臺上,進(jìn)行了仿真及實(shí)驗(yàn)驗(yàn)證。結(jié)果表明,SVG系統(tǒng)的防止電壓跌落功能良好,無功補(bǔ)償功能效果好和動(dòng)態(tài)響應(yīng)快。 最后,針對級聯(lián)H橋型SVG生產(chǎn)過程中鏈節(jié)單元測試實(shí)驗(yàn)復(fù)雜的問題,本文研制了鏈節(jié)單元的測試系統(tǒng),方便了實(shí)驗(yàn)操作,提升了工作效率。
[Abstract]:With the development of power electronics technology, power electronic switch devices are widely used. With the emergence of a large number of nonlinear loads in the power grid, reactive power demand is also increasing. Static Var Generator (SVG), as a new generation of reactive power compensation device, has the advantages of fast response speed, low loss, small volume of energy storage element and low harmonic content of output current, which can effectively compensate reactive power. In recent years, reactive power compensator is developing towards function synthesis, high voltage and large capacity. Adding a variety of working modes can also enable SVG to achieve a variety of functions. Cascade is an important method to design high voltage and large capacity reactive power compensator. In this paper, the control strategy of cascaded H-bridge SVG is studied based on the project of "10kV/7.2Mvar cascaded H-bridge SVG" in China Electric Power Plant Technology Co., Ltd., the State Grid Research Institute of Smart Grid, and the testing in the production process of the chain segment unit is optimized. The control strategy of cascaded H-bridge SVG designed in this paper includes two parts: current mode (reactive power compensation) and voltage mode (to prevent voltage drop). The emphasis of current mode is decoupling control of active current and reactive current, and three-stage balance control of DC voltage. The common cascaded H-bridge SVG has only one function of reactive power compensation. However, in the actual operation of the grid, it will also meet the problem of voltage drop. If a new device is designed to prevent the voltage from falling, it will inevitably increase the cost. In this paper, a voltage mode is added to the cascaded H-bridge SVG, which makes the SVG have two functions, reactive power compensation and voltage drop prevention, which can effectively solve this problem. In the common SVG mathematical model, active current and reactive current are coupled with each other, which increases the difficulty of control. In order to solve this problem, the active current and reactive current are decoupled, controlled separately and simplified, and good results are obtained. In cascaded H bridge SVG, DC capacitors are independent of each other. Although this simplifies the main circuit and saves the phase-shift transformer and rectifier circuit, it also brings about the problem of capacitor voltage balance control. In this paper, a three-stage balance control method of DC voltage is designed to maintain the DC voltage to the expected value. In this paper, the MATLAB/SIMULINK simulation model and experimental platform, simulation and experimental verification. The results show that SVG system has good function of preventing voltage drop, good effect of reactive power compensation and fast dynamic response. Finally, in order to solve the complex problem of chain node unit test in the production of cascaded H-bridge SVG, a chain unit testing system is developed in this paper, which facilitates the operation of the experiment and improves the working efficiency.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM761

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