【摘要】：MMC(Modular Multi-level Converter)是一種新型的柔性直流輸電拓?fù)浣Y(jié)構(gòu)。柔性直流輸電的拓?fù)浣Y(jié)構(gòu)從原始的兩電平、三電平變換器,發(fā)展到近些年流行起來(lái)的模塊化多電平變換器,它具有良好的輸出電能質(zhì)量、適應(yīng)高電壓應(yīng)用、冗余特性等優(yōu)點(diǎn)成為柔性直流輸電的研究熱點(diǎn)。本文以MMC在逆變方面應(yīng)用為主要研究方向,圍繞模塊化多電平逆變器的控制技術(shù)中涉及的調(diào)制技術(shù)、電容電壓平衡策略等展開研究,分析了它的拓?fù)浣Y(jié)構(gòu)、工作方式、數(shù)學(xué)模型、調(diào)制算法以及控制算法,并進(jìn)行了仿真和實(shí)驗(yàn)驗(yàn)證。首先介紹了模塊化多電平換流器組成結(jié)構(gòu)和基本工作原理,對(duì)模塊化多電平換流器創(chuàng)建了數(shù)學(xué)模型,適當(dāng)?shù)貙㈦娐返刃ё兓?給出了三相等效電路圖和單相等效圖,建立了以開關(guān)函數(shù)為基礎(chǔ)的公式,更加清晰地闡述了 MMC多電平換流器的工作機(jī)理。其次,針對(duì)MMC的結(jié)構(gòu)特點(diǎn),以MATLAB/Simulink為數(shù)學(xué)工具對(duì)基于載波移相調(diào)制技術(shù)的電容電壓平衡算法建立了仿真模型。對(duì)載波移相技術(shù)進(jìn)行了詳細(xì)分析,通過(guò)采用橋臂電壓均衡控制和子模塊均衡控制完成了對(duì)電容電壓的平衡控制,仿真結(jié)果表明等效開關(guān)頻率與子模塊數(shù)成正比關(guān)系,采取基于載波移相調(diào)制技術(shù)的電容電壓平衡算法,使電容電壓保持穩(wěn)定,波動(dòng)系數(shù)和輸出電壓諧波成分減小。最后,根據(jù)仿真數(shù)據(jù)和現(xiàn)有條件搭建了一個(gè)基于DSP的仿真控制平臺(tái),包括主電路、驅(qū)動(dòng)電路、電壓電流采樣調(diào)理電路等電路。通過(guò)對(duì)硬軟件的設(shè)計(jì)和調(diào)試,最后給出了上橋臂電容電壓波形,實(shí)驗(yàn)波形表明電壓的波動(dòng)系數(shù)在合理范圍以內(nèi),證明了控制策略能夠?qū)﹄娙莘�(wěn)壓同時(shí)保證了系統(tǒng)正常工作。
[Abstract]:MMC (Modular Multi-level Converter) is a new type of flexible DC transmission topology. The topology of flexible DC transmission has developed from the original two-level and three-level converters to the popular modular multilevel converters in recent years. It has good output power quality and is suitable for high voltage applications. The advantages of redundancy have become the research focus of flexible DC transmission. In this paper, the application of MMC in inverter is the main research direction. The modulation technology and capacitive voltage balance strategy involved in the control technology of modularized multilevel inverter are studied, and its topology and working mode are analyzed. The mathematical model, modulation algorithm and control algorithm are verified by simulation and experiment. Firstly, the structure and basic working principle of modularized multilevel converter are introduced. The mathematical model of modularized multilevel converter is established, and the equivalent circuit diagram of three-phase and single-phase equivalent circuit is given. The formula based on switch function is established, and the working mechanism of MMC multilevel converter is explained more clearly. Secondly, according to the structural characteristics of MMC, the simulation model of capacitor voltage balance algorithm based on carrier phase shift modulation is established with MATLAB/Simulink as a mathematical tool. The carrier phase shift technology is analyzed in detail. The capacitor voltage balance control is accomplished by using the bridge arm voltage equalization control and the sub-module equalization control. The simulation results show that the equivalent switching frequency is proportional to the number of sub-modules. The capacitive voltage balance algorithm based on carrier phase shift modulation technique is adopted to stabilize the capacitance voltage and reduce the fluctuation coefficient and the harmonic components of the output voltage. Finally, according to the simulation data and existing conditions, a simulation control platform based on DSP is built, including main circuit, driving circuit, voltage and current sampling conditioning circuit and so on. Through the design and debugging of hardware and software, the voltage waveform of the upper arm capacitor is given. The experimental waveform shows that the fluctuation coefficient of the voltage is within a reasonable range. It is proved that the control strategy can stabilize the capacitor voltage and ensure the normal operation of the system.
【學(xué)位授予單位】：西安科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TM46

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