【摘要】：隨著當今社會的快速發(fā)展，，能源環(huán)境危機問題越來越突出。煤炭、石油和天然氣等非可再生能源已經(jīng)不能滿足人類可持續(xù)發(fā)展的需要，而在眾多可再生能源中，太陽能具有可持續(xù)利用、無污染、成本低廉的優(yōu)點。太陽能發(fā)電是太陽能利用的主要形式，而逆變器是太陽能發(fā)電系統(tǒng)的核心裝置。逆變器的拓撲結構和控制策略對發(fā)電質(zhì)量有著決定性的作用。 近年來多電平逆變器成為眾多學者的研究熱點，因為多電平逆變器具有輸出電壓變化率小、輸出電壓電流諧波畸變小、開關器件頻率低損耗小和輸出共模電壓小等優(yōu)點，這些優(yōu)點使得多電平逆變器在光伏發(fā)電系統(tǒng)中擁有廣闊的應用空間。 本論文首先介紹了太陽能電池的特性、光伏發(fā)電技術和多電平逆變器的發(fā)展及應用等。分析了幾種常見的多電平逆變器的拓撲結構的特點和幾種常用的多電平逆變器的PWM調(diào)制策略的特點。對一種基于二極管的二進制級聯(lián)疊加式多電平逆變器進行改進使其應用于光伏并網(wǎng)中，把單相多電平空間矢量調(diào)制策略應用于基于二極管的二進制級聯(lián)疊加式多電平逆變器的并網(wǎng)策略中，并在MATLAB/SIMULINK中搭建電路模型進行了的仿真驗證。 提出了一種適用于光伏發(fā)電領域的一種新型不對稱三電平三相逆變器拓撲結構，對其工作原理進行了分析，然后以逆變器輸出電壓的諧波畸變率和開關器件的損耗為依據(jù)分析比較了多電平逆變器的PWM調(diào)制策略，研究了電容電壓變化時對逆變器輸出線電壓的影響，并在MATLAB/SIMULINK中建立電路系統(tǒng)模型進行了仿真驗證。 其次，以型號TMS320F28335的DSP芯片為核心處理器設計了新型不對稱三電平三相逆變器的驗證性硬件電路，并對逆變器的硬件系統(tǒng)進行了介紹。 最后對全文所做工作進行了總結和展望。
[Abstract]:With the rapid development of today's society, the problem of energy and environment crisis becomes more and more prominent. Non-renewable energy such as coal, oil and natural gas can not meet the needs of human sustainable development. In many renewable energy sources, solar energy has the advantages of sustainable utilization, no pollution and low cost. Solar power generation is the main form of solar energy utilization, and inverter is the core device of solar power generation system. The topology and control strategy of inverter play a decisive role in the quality of power generation. In recent years, multilevel inverter has become the research hotspot of many scholars, because multilevel inverter has the advantages of low output voltage change rate, low output voltage and current harmonic distortion, low switching device frequency loss and low output common-mode voltage, etc. These advantages make multilevel inverter have wide application space in photovoltaic power generation system. Firstly, the characteristics of solar cells, the development and application of photovoltaic technology and multilevel inverter are introduced. The characteristics of several common topology structures of multilevel inverters and the PWM modulation strategies of several commonly used multilevel inverters are analyzed in this paper. A diode-based binary cascade cascaded multilevel inverter is improved to be used in photovoltaic grid connection. The single-phase multilevel space vector modulation strategy is applied to the grid-connected strategy of diode-based cascaded multilevel inverter, and the circuit model in MATLAB/SIMULINK is simulated and verified. A new type of asymmetric three-level three-phase inverter topology suitable for photovoltaic power generation is proposed, and its working principle is analyzed. Based on the harmonic distortion rate of the output voltage of the inverter and the loss of the switching device, the PWM modulation strategy of the multi-level inverter is analyzed and compared, and the influence of the capacitance voltage on the output line voltage of the inverter is studied. The circuit system model is established in MATLAB/SIMULINK and verified by simulation. Secondly, the verification hardware circuit of the novel asymmetrical three-level three-phase inverter is designed based on the DSP chip of the model TMS320F28335, and the hardware system of the inverter is introduced. Finally, the paper summarizes and looks forward to the work done in this paper.
【學位授予單位】：鄭州大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM464

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