發(fā)布時(shí)間：2018-01-16 07:02

  本文關(guān)鍵詞：電網(wǎng)不平衡時(shí)模塊化多電平換流器的控制研究　出處：《合肥工業(yè)大學(xué)》2015年碩士論文　論文類(lèi)型：學(xué)位論文

  更多相關(guān)文章： 模塊化多電平換流器 電壓平衡 電網(wǎng)不平衡 分層式控制系統(tǒng) 實(shí)驗(yàn)平臺(tái)

【摘要】：近年來(lái),隨著電力電子技術(shù)的發(fā)展,高壓大功率電力電子設(shè)備被廣泛應(yīng)用于電力系統(tǒng)中的柔性交流輸電、高壓直流輸電、靜止無(wú)功補(bǔ)償?shù)葓?chǎng)合,其能夠有效地提高系統(tǒng)電能質(zhì)量和輸配電系統(tǒng)效率。隨著新能源的快速發(fā)展,柔性直流輸電技術(shù)將會(huì)在我國(guó)未來(lái)電網(wǎng)的發(fā)展中起到十分關(guān)鍵的作用。在柔性直流輸電工程中,多電平換流器由于其輸出波形諧波含量低、功率器件電壓應(yīng)力低等優(yōu)點(diǎn),被越來(lái)越多地應(yīng)用于高壓大功率領(lǐng)域中。在眾多多電平拓?fù)渲?模塊化多電平拓?fù)?MMC)由于具有模塊化易擴(kuò)展、良好的冗余特性、輸出諧波低、功率器件開(kāi)關(guān)頻率低等優(yōu)點(diǎn),使之成為近年來(lái)的研究熱點(diǎn)。本文首先對(duì)MMC的拓?fù)浣Y(jié)構(gòu)及工作原理進(jìn)行了分析,分析推導(dǎo)了MMC正常工作時(shí)上下橋臂電壓,輸出交流電壓及上下橋臂電流,環(huán)流和交流輸出電流之間的關(guān)系。對(duì)目前常用的調(diào)制策略、電容電壓平衡技術(shù)做了全面的闡述,詳細(xì)分析了載波層疊PWM調(diào)制、載波移相PWM調(diào)制和NLM調(diào)制等MMC調(diào)制策略,并構(gòu)造了橋臂能量和控制器及橋臂能量差控制器來(lái)控制子模塊電容電壓的平衡。本文接著研究了電網(wǎng)不平衡條件下MMC的控制策略。對(duì)三相MMC的一相建立了等效電路模型并進(jìn)行了數(shù)學(xué)分析,分析了電網(wǎng)不平衡時(shí)MMC的工作特性,然后研究了電網(wǎng)不平衡時(shí)MMC的控制策略,主要對(duì)比分析了三種控制方法：基于dq同步旋轉(zhuǎn)坐標(biāo)系的控制方法、基于PR調(diào)節(jié)器的控制方法、基于準(zhǔn)PR調(diào)節(jié)器的控制方法,并搭建了MATLAB/Simulink仿真模型進(jìn)行驗(yàn)證。最后設(shè)計(jì)并搭建了基于分層思想的三相MMC實(shí)驗(yàn)平臺(tái),具體包括：MMC硬件系統(tǒng)設(shè)計(jì)和軟件控制系統(tǒng)設(shè)計(jì)。其中硬件系統(tǒng)設(shè)計(jì)包括主電路設(shè)計(jì)及主控制器(DSP)、橋臂控制器(FPGA)、子模塊控制器(CPLD)的設(shè)計(jì),DSP、FPGA、 CPLD構(gòu)成了MMC的三層控制系統(tǒng)。軟件控制系統(tǒng)設(shè)計(jì)包括上述三層控制器的軟件設(shè)計(jì)。在此實(shí)驗(yàn)平臺(tái)的基礎(chǔ)上,進(jìn)行了基于直接調(diào)制法和子模塊電容電壓排序法的開(kāi)環(huán)實(shí)驗(yàn),實(shí)驗(yàn)結(jié)果表明了方案的可行性。
[Abstract]:In recent years, with the development of power electronics technology, high-voltage high-power power electronic equipment is widely used in the power system of flexible AC transmission, high-voltage direct current transmission, static reactive power compensation and other occasions. It can effectively improve the system power quality and transmission and distribution system efficiency. With the rapid development of new energy. Flexible direct current transmission technology will play a very important role in the future development of power grid in China. In the flexible direct current transmission project, the multilevel converter has low harmonic content due to its output waveform. Power devices with low voltage stress are more and more used in high-voltage and high-power fields. Among many multilevel topologies, modularized multilevel topology (MMCs) is easy to expand because of its modularization. Good redundancy, low output harmonics and low switching frequency of power devices make it a hot research topic in recent years. Firstly, the topology and working principle of MMC are analyzed in this paper. The relationship between upper and lower arm voltage, output AC voltage, upper and lower arm current, circulation and AC output current during normal operation of MMC is analyzed and deduced. The capacitive voltage balance technology is described in detail, and the strategies of carrier stacked PWM modulation, carrier phase-shifted PWM modulation and NLM modulation are analyzed in detail. The bridge arm energy and controller and the bridge arm energy difference controller are constructed to control the capacitor voltage balance of the submodule. Then, the control strategy of MMC under the unbalanced power grid is studied. The one-phase construction of the three-phase MMC is established. The equivalent circuit model and mathematical analysis are carried out. This paper analyzes the working characteristics of MMC when the power network is unbalanced, and then studies the control strategy of MMC when the power network is unbalanced. Three control methods are compared and analyzed: the control method based on DQ synchronous rotating coordinate system. The control method based on PR regulator and the control method based on quasi-PR regulator. Finally, a three-phase MMC experimental platform based on layered theory is designed and built. The hardware system design includes the main circuit design and the main controller DSPG, the bridge arm controller and the FPGA. the hardware system design includes the hardware system design and the software control system design of the MMC, including the main circuit design and the main controller DSPG, the bridge arm controller. The design of submodule controller (CPLD) is based on DSP FPGA. CPLD is the three-layer control system of MMC. The software control system design includes the software design of the three-layer controller mentioned above. On the basis of this experimental platform. The open loop experiment based on direct modulation method and capacitor voltage sort method of sub-module is carried out. The experimental results show the feasibility of the scheme.
【學(xué)位授予單位】：合肥工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TM46

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