本文選題：微型逆變器 + 拓撲結(jié)構(gòu)　； 參考：《長安大學》2014年碩士論文

【摘要】：傳統(tǒng)的光伏發(fā)電系統(tǒng)是將光伏面板串、并聯(lián)連接后由集中式逆變器將直流電轉(zhuǎn)化為交流電，這種系統(tǒng)由于每塊電池板存在著差異性和陰影遮擋等問題而導(dǎo)致發(fā)電效率不高和熱斑等問題，為了解決上述問題，將每塊光伏面板都與一個逆變器相連接，，這樣就可以對每塊面板進行最大功率點跟蹤控制，從而大幅度提高整體效率，這種逆變器功率等級較低，稱之為微型逆變器。 本文首先介紹了微型逆變器的應(yīng)用特點、性能要求及幾種關(guān)鍵技術(shù)，然后對比研究了推挽串聯(lián)諧振式電壓型和推挽式電流型、反激式電壓型和反激式電流型，分析了它們的工作原理及各自的優(yōu)缺點，并對反激式和推挽式結(jié)構(gòu)在功率解耦方面進行了討論研究，為解決上述拓撲存在的問題，提出交錯反激式和雙向反激式微型逆變器拓撲結(jié)構(gòu)，并分析了各自的優(yōu)缺點。隨后對提高微型逆變器效率的方法進行了分析，具體介紹了軟開關(guān)技術(shù)和SiC功率器件的應(yīng)用，其中通過計算了解了軟開關(guān)的工作狀態(tài)，然后通過SiC功率器件和Si功率器件耗損的對比，得出了SiC器件能夠提高效率的結(jié)論。最后利用Pspice仿真軟件對采用交錯反激式結(jié)構(gòu)和雙反激結(jié)構(gòu)及SiC功率器替換Si器件后件進行仿真，仿真結(jié)果理論計算和實際相對。
[Abstract]:The traditional photovoltaic power generation system is to connect the PV panel string in parallel and convert DC to AC from the centralized inverter.In order to solve the above problems, each PV panel is connected to an inverter because of the difference of each panel and the problems of shadow occlusion and so on, which lead to the low efficiency and heat spot of power generation, so as to solve the above problems, each photovoltaic panel is connected to an inverter.In this way, the maximum power point tracking control can be carried out on each panel, which greatly improves the overall efficiency. This inverter has a lower power level and is called a miniature inverter.In this paper, the application characteristics, performance requirements and several key technologies of micro inverter are introduced, then the push-pull series resonant voltage mode and push-pull current mode, flyback voltage mode and flyback current mode are compared and studied.Their working principles and their advantages and disadvantages are analyzed, and the power decoupling of flyback and push-pull structures is discussed.The topology of interleaved flyback and bidirectional flyback micro inverters is proposed, and their advantages and disadvantages are analyzed.Then the method of improving the efficiency of micro inverter is analyzed. The soft switching technology and the application of SiC power device are introduced in detail.Then, by comparing the consumption of SiC power device with Si power device, it is concluded that SiC device can improve the efficiency.Finally, the interleaved flyback structure and double flyback structure and SiC power device replacing Si device are simulated by Pspice simulation software. The simulation results are compared with the actual results.
【學位授予單位】：長安大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM464

【共引文獻】

相關(guān)博士學位論文 前1條

1 鄭偉;光伏并網(wǎng)逆變器辨識建模方法及應(yīng)用[D];重慶大學;2014年

相關(guān)碩士學位論文 前10條

1 李勇芝;光伏并網(wǎng)微逆變器狀態(tài)監(jiān)測系統(tǒng)的設(shè)計與實現(xiàn)[D];西南交通大學;2012年

2 黃紅橋;單級式光伏并網(wǎng)微型逆變器研究[D];中南大學;2012年

3 余俊宏;單相Z源并網(wǎng)逆變器的研究[D];上海交通大學;2012年

4 陸寅;500W光伏獨立/并網(wǎng)雙模逆變器的研究[D];安徽大學;2013年

5 孫瑩瑩;電流型全橋單級PFC變換器無源無損緩沖技術(shù)研究[D];哈爾濱工業(yè)大學;2013年

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