近年來因為能源的短缺與環保問題受到各國的重視，因此尋找新能源取代石化能源成為時勢所趨。太陽光電能兼具環保及源源不絕的優勢，為最主要的且也是最有效益的再生能源之一。
本論文利用太陽能電池，配合太陽能最大功率追蹤技術，與市電經過功率因數修正器後以直流並聯方式，達到節能之目的。所使用的最大功率追蹤演算法為增量電導法，比起常用的擾動觀察法更能準確的追蹤最大功率點，但因為功率因數修正器具有穩壓的功能，與最大功率追蹤器並聯後會影響所追蹤的最大功率點位置。因此本論文在最大功率追蹤器後再串聯一級DC/DC轉換器，使得太陽能電池的最大功率能夠完全輸出給後級。經由實作電路的實驗數據及波形，可以證明本系統可準確的將最大功率輸出給後級負載，並達到節省能源的目的。

Recently, due to global concern of energy shortage and environmental issues, it becomes urgent to seek a substitute for fossil fuel. Solar energy, which is natural and inexhaustible, is one of the most important and effective renewable energy resources.
This thesis fulfills a DC power source by paralleling a photovoltaic (PV) system with maximum power point tracking (MPPT) technique to a power factor corrector fed by the utility. The incremental conductance method, which is more accurate than the perturbation and observation method, is adopted to achieve MPPT. However, since the DC output voltage of the power factor corrector is regulated, the MPPT circuit might malfunction when parallel connected. Therefore, a converter is added following the MPPT circuit to realize the maximum transfer of solar energy. All the objectives stated above have been verified by experimental results on a prototype system.

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