本文關(guān)鍵詞：基于模塊化多電平結(jié)構(gòu)高壓變頻器控制系統(tǒng)研究　出處：《湖南大學(xué)》2015年碩士論文　論文類(lèi)型：學(xué)位論文

  更多相關(guān)文章： 模塊化多電平變流器 電容電壓平衡控制 四象限運(yùn)行 高壓變頻器 低頻

【摘要】：能源問(wèn)題已經(jīng)成為一個(gè)全球性的重大問(wèn)題,節(jié)能減排我國(guó)現(xiàn)階段發(fā)展的一個(gè)重大方向。高壓變頻器是工業(yè)領(lǐng)域節(jié)能的重要手段,其所應(yīng)用的多電平技術(shù)也已成為高壓大功率傳動(dòng)領(lǐng)域的主流技術(shù),主要有以下三種拓?fù)?二極管鉗位型、飛跨電容型以及H橋功率單元級(jí)聯(lián)型結(jié)構(gòu)。目前,這幾種結(jié)構(gòu)的多電平技術(shù)雖然比較成熟,但仍存在不少問(wèn)題,且對(duì)于高性能的高壓變頻器系統(tǒng),其應(yīng)用將受到限制。因此,本文提出將模塊化多電平變流器(Modular Multilevel Converter,MMC)的拓?fù)浣Y(jié)構(gòu)應(yīng)用到傳動(dòng)領(lǐng)域,構(gòu)成新型的高性能高壓變頻系統(tǒng)。首先,本文對(duì)模塊化多電平變換器的拓?fù)浣Y(jié)構(gòu)和工作原理做出基本介紹,對(duì)其適用在傳動(dòng)領(lǐng)域的基本特點(diǎn)進(jìn)行分析,從整體上給出主拓?fù)鋱D,包括與電網(wǎng)相連的MMC整流器、與交流異步電動(dòng)機(jī)相連的MMC逆變器以及直流母線端,并重點(diǎn)介紹半橋型子模塊結(jié)構(gòu)的工作狀態(tài)及運(yùn)行方式,同時(shí)對(duì)在此基礎(chǔ)上的幾種電氣模型進(jìn)行比較分析。同時(shí),對(duì)常用的調(diào)制策略進(jìn)行介紹,并對(duì)啟動(dòng)時(shí)整流側(cè)和逆變側(cè)的預(yù)充電做出系統(tǒng)闡述。本文的控制整體分為兩部分:整流側(cè)的控制和逆變側(cè)的控制。整流側(cè)連接電網(wǎng),起到實(shí)現(xiàn)單位輸入功率因數(shù)控制、減少諧波污染和穩(wěn)定直流側(cè)母線電壓的作用。因此,文章從MMC整流器出發(fā),在模塊化多電平電氣模型的基礎(chǔ)上進(jìn)一步對(duì)MMC整流器建立數(shù)學(xué)模型,以此為依據(jù),分析系統(tǒng)相間環(huán)流產(chǎn)生原因、存在方式和具體數(shù)學(xué)關(guān)系,表明環(huán)流的存在并不影響MMC外部特性,但會(huì)對(duì)增大橋臂損耗,并給出具體環(huán)流抑制措施。本文重點(diǎn)對(duì)電壓均衡問(wèn)題進(jìn)行分析,基于載波移相調(diào)制策略闡述模塊化多電平變流器電壓平衡控制過(guò)程,并經(jīng)過(guò)仿真驗(yàn)證其可行性,得到穩(wěn)定的直流電壓。最后,本文將MMC逆變器與異步電機(jī)結(jié)合,采用按轉(zhuǎn)子磁鏈定向的矢量控制對(duì)電機(jī)進(jìn)行調(diào)速�？紤]到傳動(dòng)領(lǐng)域電機(jī)多數(shù)運(yùn)行在低頻工況,本文對(duì)MMC模型低頻情況進(jìn)行探討,提出一種低頻控制方案,并通過(guò)仿真驗(yàn)證理論分析的正確性和方法的可行性。
[Abstract]:Energy problem has become a major global problem, energy conservation and emission reduction of our country at the present stage of a major direction. High voltage inverter is an important means of energy saving in the industrial field. The multi-level technology has also become the mainstream technology in the field of high voltage and high power transmission. There are mainly three kinds of topology: diode clamp, fly capacitor and H bridge power unit cascaded structure. At present, the multilevel technology of these structures is quite mature, but there are still many problems, and the application of high-performance multilevel inverter system will be limited. Therefore, this paper proposes to apply the topology of Modular Multilevel Converter (MMC) to the transmission field, and form a new high-performance HV frequency conversion system. First of all, the topological structure and working principle of modular multilevel converter make the basic introduction, applicable to the basic characteristics in the field of transmission is analyzed, from a given main topology on the whole, including the MMC MMC rectifier inverter and AC asynchronous motor, and connected to the DC bus terminal connected to the grid, and focuses on working condition and operation mode of half bridge sub modules, and several electrical model on the basis of comparative analysis. At the same time, the commonly used modulation strategies are introduced, and the pre charging of the rectifier side and the inverter side is systematically expounded. The overall control of this paper is divided into two parts: control of the rectifier side and the control of the inverter side. The rectifier connects the power grid to realize the unit input power factor control, reduce the harmonic pollution and stabilize the DC bus voltage. Therefore, this article from the MMC rectifier of basic multilevel electrical model in the module on the further establishment of the mathematical model of MMC rectifier, on this basis, analysis of system phase existence and the mathematical relationship between the specific circulation causes, that circulation is the influence of the external characteristics of MMC, but will increase the leg loss, and give the specific measures to suppress circulation. This paper focuses on voltage balancing problem. Based on carrier phase shift modulation strategy, the voltage balance control process of modular multilevel converter is expounded, and its feasibility is verified through simulation, and a stable DC voltage is obtained. Finally, this paper combines the MMC inverter with the asynchronous motor, and uses the vector control of the rotor flux orientation to speed the motor. Considering that most of the motors in the transmission field operate at low frequency, this paper discusses the low frequency of the MMC model, proposes a low frequency control scheme, and verifies the correctness of the theoretical analysis and the feasibility of the method through simulation.
【學(xué)位授予單位】：湖南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TM921.51;TM46

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