高增益電力轉換器應用於獨立型太陽能發電系統

Abstract

本研究提出了一種新型的高增益電力轉換器，旨在應用於獨立型太陽能發電系統。在太陽能發電系統中，電力電子轉換器和最大功率點追蹤技術是該系統的兩個關鍵要素。由於傳統太陽能板的發電輸出電壓較低，因此需要透過串聯的方式來提高電壓水平。然而，這也導致當太陽能板發生遮蔭現象時，輸出功率會急劇下降，進而影響整體系統轉換效率的問題。首先，本研究提出的高增益電力轉換器能夠接受太陽能板的輸入電壓範圍為20V-40V。所提出的電力轉換器將在低責任週期下操作，將輸入電壓轉換為380V的直流電，轉換效率達到80%以上。此外，所提出的轉換器與爬山演算法最大功率追蹤算法結合運用，以實現系統的最大發電效能，其中最大功率點效能達99%。其次，本系統可將太陽能板以並聯的方式連接，以改善太陽能板串聯產生遮蔭問題，進而提升系統效能。最後，本研究使用MATLAB進行模擬和實測驗證，證明所提出的電力轉換器的效能優於傳統的升壓式轉換器。This study proposes a new type of high-gain power converter intended for use in stand-alone solar power generation systems. In solar power generation systems, power electronic converters and maximum power point tracking technology are two key elements of the system. Since the power output voltage of traditional solar panels is low, it is necessary to increase the voltage level through series connection. However, this also leads to the problem that when the solar panel is shaded, the output power will drop sharply, thus affecting the overall system conversion efficiency. First, the high-gain power converter proposed in this study can accept the input voltage range of the solar panel from 20V-40V. The proposed power converter will operate at low duty cycles, converting the input voltage to 380V DC with a conversion efficiency of over 80%. In addition, the proposed converter is combined with the hill-climbing algorithm maximum power tracking algorithm to achieve the maximum power generation efficiency of the system, with the maximum power point efficiency reaching 99%. Secondly, this system can connect solar panels in parallel to improve the shading problem caused by series connection of solar panels, thereby improving system efficiency. Finally, this study uses MATLAB for simulation and actual measurement verification to prove that the performance of the proposed power converter is better than the traditional boost converter.