本文選題：光伏并網(wǎng)逆變器 + 兩級(jí)結(jié)構(gòu)　； 參考：《遼寧工業(yè)大學(xué)》2014年碩士論文

【摘要】：隨著化石能源的日益匱乏，電力供應(yīng)的緊張，生態(tài)環(huán)境的惡化，可再生能源的利用勢(shì)在必行。太陽(yáng)能作為綠色新能源得到廣泛應(yīng)用，光伏發(fā)電成為太陽(yáng)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(guān)鍵部件，因此對(duì)其研究顯得越來(lái)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(guó)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(jié)構(gòu)和電路拓?fù)�，比較分析各種常用變換電路的優(yōu)缺點(diǎn)，結(jié)合本文系統(tǒng)中小功率的特點(diǎn)，采用典型的兩級(jí)式非隔離結(jié)構(gòu)，前級(jí)DC/DC變換器選用Boost電路，，后級(jí)DC/AC變換器采用全橋電路。重點(diǎn)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(duì)擾動(dòng)觀察法出現(xiàn)誤判現(xiàn)象給出一種基于功率預(yù)測(cè)的優(yōu)化改進(jìn)算法。 重點(diǎn)研究了并網(wǎng)控制技術(shù)，選用電流電壓雙閉環(huán)控制策略并用MATLAB進(jìn)行了仿真。針對(duì)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(fù)控制復(fù)合的控制策略，使光伏系統(tǒng)既有PI控制的快速響應(yīng)特性又有重復(fù)控制優(yōu)越的穩(wěn)態(tài)性能，實(shí)現(xiàn)無(wú)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(xué)位授予單位】：遼寧工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM464;TM615

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