【摘要】：為實(shí)現(xiàn)電動機(jī)的高效節(jié)能運(yùn)行，多電平變換器已經(jīng)被廣泛應(yīng)用到電氣傳動領(lǐng)域，模塊化多電平變換器（Modular Multilevel Converter, MMC）作為多電平變換器的一種，因其模塊化程度高、電壓等級易于擴(kuò)充等優(yōu)點(diǎn)，成為近年來研究的熱點(diǎn)。本文以MMC作為研究對象，圍繞MMC載波移相調(diào)制策略、子模塊電容電壓控制策略、低頻運(yùn)行控制策略以及實(shí)驗(yàn)樣機(jī)研制進(jìn)行了研究。 介紹了MMC的拓?fù)浣Y(jié)構(gòu)以及工作原理，分析了適用于MMC的五電平和九電平兩種載波移相調(diào)制策略，在相同硬件條件下，九電平載波移相調(diào)制策略諧波特性更好；分析了它勵和自勵兩種子模塊電容預(yù)充電控制策略的具體實(shí)現(xiàn)方法；研究了子模塊電容電壓均衡控制策略；借助Matlab/Simulink進(jìn)行了仿真研究，仿真結(jié)果表明所分析的MMC載波移相調(diào)制策略和子模塊電容電壓控制策略正確可行。 對MMC進(jìn)行數(shù)學(xué)建模，，根據(jù)數(shù)學(xué)模型，分析了MMC低頻運(yùn)行特性，分析結(jié)果表明子模塊電容電壓的波動與輸出電流幅值成正比，與輸出頻率成反比；為抑制低頻工況子模塊電容電壓的波動，通過疊加高頻零序電壓和相間環(huán)流來提升橋臂能量的波動頻率，進(jìn)而抑制了電容電壓的波動；對帶阻感負(fù)載固定調(diào)制度運(yùn)行和帶電機(jī)負(fù)載全速段運(yùn)行兩種工況分別進(jìn)行了仿真研究，仿真結(jié)果表明所分析的低頻運(yùn)行控制策略正確可行。 從主回路和控制系統(tǒng)兩個角度進(jìn)行MMC實(shí)驗(yàn)樣機(jī)的設(shè)計(jì)，設(shè)計(jì)了主回路器件參數(shù)以及子模塊硬件結(jié)構(gòu)，設(shè)計(jì)了基于主控制器+輔助控制器+子模塊控制器的控制系統(tǒng)架構(gòu)，并對各級控制器的軟件進(jìn)行了設(shè)計(jì)。采用所研制實(shí)驗(yàn)樣機(jī)對MMC進(jìn)行了實(shí)驗(yàn)驗(yàn)證，實(shí)驗(yàn)結(jié)果表明所分析的載波移相調(diào)制策略、子模塊電容電壓控制策略以及低頻運(yùn)行控制策略正確可行。
[Abstract]:In order to realize the efficient and energy-saving operation of motor, multilevel converter has been widely used in the field of electrical transmission. As a kind of multilevel converter, modular multilevel converter (Modular Multilevel Converter, MMC), because of its high degree of modularization, has been widely used in the field of electrical transmission. The voltage level is easy to expand and so on, which has become a hot research topic in recent years. Taking MMC as the research object, this paper focuses on MMC carrier phase-shift modulation strategy, capacitor voltage control strategy of sub-module, low-frequency operation control strategy and experimental prototype development. This paper introduces the topology and working principle of MMC, analyzes two kinds of carrier phase-shifted modulation strategies, five-level and nine-level, which are suitable for MMC. Under the same hardware condition, the nine-level carrier phase-shift modulation strategy has better harmonic characteristics. The realization method of capacitor pre-charging control strategy for two sub-modules is analyzed, and the control strategy of capacitor voltage equalization for sub-modules is studied. With the help of Matlab/Simulink, the simulation results show that the MMC carrier phase-shift modulation strategy and the capacitor voltage control strategy of sub-module are correct and feasible. According to the mathematical model of MMC, the operating characteristics of MMC at low frequency are analyzed. The results show that the fluctuation of capacitance voltage in sub-module is proportional to the amplitude of output current and inversely proportional to the output frequency. In order to restrain the fluctuation of capacitance voltage of sub-module in low frequency condition, the fluctuation frequency of bridge arm energy is increased by adding high frequency zero sequence voltage and interphase circulation, and then the fluctuation of capacitance voltage is restrained. The simulation results show that the control strategy of low frequency operation is correct and feasible for the fixed regulation operation with resistance induction load and the full speed operation at full speed section of the load with motor. The simulation results show that the control strategy for low frequency operation is correct and feasible. The experimental prototype of MMC is designed from the view of main loop and control system. The parameters of main circuit and the hardware structure of sub-module are designed, and the control system architecture based on main controller assistant controller sub-module controller is designed. At the same time, the software of all kinds of controllers is designed. The experimental results show that the carrier phase-shift modulation strategy, capacitor voltage control strategy of sub-module and low-frequency operation control strategy are correct and feasible.
【學(xué)位授予單位】：中國礦業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM46

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