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  本文選題：光伏并網(wǎng)逆變器 + 兩級結構��； 參考：《遼寧工業(yè)大學》2014年碩士論文

【摘要】：隨著化石能源的日益匱乏，電力供應的緊張，生態(tài)環(huán)境的惡化，可再生能源的利用勢在必行。太陽能作為綠色新能源得到廣泛應用，光伏發(fā)電成為太陽能利用的重要方式。而光伏并網(wǎng)逆變器又是并網(wǎng)光伏發(fā)電系統(tǒng)的關鍵部件，因此對其研究顯得越來越重要。 本文研究了光伏并網(wǎng)逆變器的目的和意義，介紹國內(nèi)外研究現(xiàn)狀，給出了光伏并網(wǎng)的要求。研究了光伏發(fā)電系統(tǒng)結構和電路拓撲，比較分析各種常用變換電路的優(yōu)缺點，結合本文系統(tǒng)中小功率的特點，采用典型的兩級式非隔離結構，前級DC/DC變換器選用Boost電路，，后級DC/AC變換器采用全橋電路。重點分析了光伏電池工作原理和等效模型，得出了輸出特性曲線，然后討論了常見的MPPT控制方法，針對擾動觀察法出現(xiàn)誤判現(xiàn)象給出一種基于功率預測的優(yōu)化改進算法。 重點研究了并網(wǎng)控制技術，選用電流電壓雙閉環(huán)控制策略并用MATLAB進行了仿真。針對PI控制不能消除交流量穩(wěn)態(tài)誤差，給出雙閉環(huán)與重復控制復合的控制策略，使光伏系統(tǒng)既有PI控制的快速響應特性又有重復控制優(yōu)越的穩(wěn)態(tài)性能，實現(xiàn)無靜差。
[Abstract]:With the increasing shortage of fossil energy, the shortage of electricity supply and the deterioration of ecological environment, the utilization of renewable energy is imperative.Solar energy as a new green energy is widely used, photovoltaic power generation has become an important way of solar energy utilization.Photovoltaic grid-connected inverter is the key component of grid-connected photovoltaic power generation system, so it is more and more important to study it.In this paper, the purpose and significance of photovoltaic grid-connected inverter are studied, the research status at home and abroad is introduced, and the requirements of photovoltaic grid-connected inverter are given.The structure and circuit topology of photovoltaic power generation system are studied. The advantages and disadvantages of various common conversion circuits are compared and analyzed. Combined with the characteristics of small power in this paper, the typical two-stage non-isolated structure is adopted, and the Boost circuit is used in the former DC/DC converter.The full bridge circuit is used in the rear stage DC/AC converter.The working principle and equivalent model of photovoltaic cell are analyzed emphatically, the output characteristic curve is obtained, then the common MPPT control method is discussed, and an optimized and improved algorithm based on power prediction is proposed to deal with the misjudgment of disturbance observation method.The grid-connected control technology is studied emphatically. The current and voltage double closed loop control strategy is selected and simulated by MATLAB.In view of the fact that Pi control can not eliminate the steady-state error of AC quantity, a compound control strategy of double closed loop and repetitive control is proposed, which makes photovoltaic system have both the fast response characteristics of Pi control and the excellent steady-state performance of repetitive control, so that there is no static error.
【學位授予單位】：遼寧工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM464;TM615

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