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  本文關(guān)鍵詞：模塊化多電平變換器控制策略研究　出處：《中國礦業(yè)大學》2015年碩士論文　論文類型：學位論文

  更多相關(guān)文章： 模塊化多電平 脈沖移相 優(yōu)化排序 模塊變動選擇法 樣機研制

【摘要】：模塊化多電平變換器(Modular Multilevel Converter,MMC)因其具有公共直流母線的模塊化拓撲結(jié)構(gòu)的特點而被廣泛應用于高壓直流輸電、電能質(zhì)量治理以及電氣傳動等領(lǐng)域,因此對MMC及其控制策略的研究有著理論和工程意義。本文主要對MMC的相關(guān)控制策略進行研究,包括調(diào)制策略、子模塊電容電壓控制策略、內(nèi)部環(huán)流抑制策略,本文還設計研制了一臺MMC五電平的實驗樣機,并對本文采用的控制策略進行實驗驗證。介紹了MMC拓撲結(jié)構(gòu)與常見的子模塊結(jié)構(gòu),建立了MMC數(shù)學模型,研究了MMC運行控制規(guī)律;論述了適用于MMC的調(diào)制策略,分析了各種載波調(diào)制以及最近電平逼近調(diào)制的實現(xiàn)方法;重點研究和分析了輸出相電壓分別為五電平、九電平時載波移相調(diào)制的區(qū)別以及脈沖移相代替載波移相的可行性。從橋臂能量脈動變化規(guī)律入手,分析子模塊電容電壓波動規(guī)律,推導電容選取的原則;結(jié)合MMC拓撲結(jié)構(gòu)和工作原理,研究了一種利用自身直流母線對懸浮電容預充電的方法;對傳統(tǒng)排序法進行改進,采用一種基于雙保持因子及排序電壓上下限的優(yōu)化排序法,在保證各子模塊電容電壓均衡的前提下有效降低開關(guān)器件的開關(guān)頻率。分析了環(huán)流形成機理、環(huán)流的性質(zhì)與作用;從橋臂功率脈動的角度出發(fā)分析了影響二倍頻環(huán)流幅值的因素,推導了橋臂電感選取公式;研究了基于模塊變動選擇法的環(huán)流抑制策略,并將其與優(yōu)化排序算法相結(jié)合,達到抑制環(huán)流、均衡電容電壓、降低開關(guān)頻率的目的。從主回路和控制系統(tǒng)兩個角度研制了一臺五電平MMC實驗樣機,主回路設計包括主要器件參數(shù)設計與選型,控制系統(tǒng)設計包括控制系統(tǒng)架構(gòu)設計和程序設計;在所研制的MMC實驗樣機上對基于模塊變動選擇算法和優(yōu)化排序算法的控制策略進行實驗驗證,實驗結(jié)果表明該控制策略可以均衡子模塊電容電壓、降低開關(guān)頻率、有效減小環(huán)流幅值,驗證了上述控制策略的可行性與正確性。
[Abstract]:Modular multilevel converter with Modular Multilevel Converter. MMC) is widely used in HVDC transmission, power quality control and electrical transmission due to its modular topology of common DC bus. Therefore, the study of MMC and its control strategy has theoretical and engineering significance. This paper mainly studies the related control strategies of MMC, including modulation strategy, submodule capacitive voltage control strategy. In this paper, an experimental prototype of MMC five-level is designed and developed, and the control strategy used in this paper is verified experimentally. The topology of MMC and the common sub-module structure are introduced. The mathematical model of MMC is established and the control law of MMC is studied. The modulation strategies suitable for MMC are discussed, and the realization methods of various carrier modulation and nearest level approach modulation are analyzed. The emphasis is put on the study and analysis of the difference of the output phase voltage being five levels, the difference of the nine-electric carrier phase shift modulation and the feasibility of the pulse phase shifting instead of the carrier phase shift, starting with the variation law of the bridge arm energy pulsation. The rule of capacitance voltage fluctuation of submodule is analyzed, and the principle of capacitance selection is deduced. Based on the topology and working principle of MMC, a method of precharging levitation capacitor using DC bus is studied. The traditional sorting method is improved and an optimal sorting method based on the double hold factor and the upper and lower bound of the sort voltage is adopted. The switching frequency of the switch device is reduced effectively on the premise of ensuring the capacitor voltage equalization of each sub-module. The forming mechanism of the circulation and the nature and function of the circulation are analyzed. From the angle of the power pulsation of the bridge arm, the factors affecting the amplitude of the second harmonic circulation are analyzed, and the formula for selecting the inductance of the bridge arm is derived. The circulation suppression strategy based on modular variable selection method is studied and combined with the optimal sorting algorithm to suppress the circulation and equalize the capacitance voltage. In order to reduce the switching frequency, a five-level MMC experimental prototype is developed from the view of main circuit and control system. The main circuit design includes the design and selection of main device parameters. Control system design includes control system architecture design and program design. The experimental results show that the control strategy based on modular variable selection algorithm and optimal sorting algorithm can equalize the capacitance voltage of the sub-module on the developed MMC experimental prototype. The feasibility and correctness of the control strategy are verified by reducing the switching frequency and effectively reducing the circulation amplitude.
【學位授予單位】：中國礦業(yè)大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TM46

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