| Summary: | 碩士 === 國立臺灣科技大學 === 電機工程系 === 105 === Photovoltaic generation system (PGS) gains popularity in the market due to the advantages of free fuel consumption, low maintenance cost and environmental sustainability. For PGS, maximum power point tracking (MPPT) is one of the essential part since it can maximize the utilization of solar energy when the PGS is installed in the area with rapidly changing irradiance. There is certain amount of energy loss if MPPT system fails to instantly operate at the MPP. Consequently, it is very crucial to develop a novel MPPT method featuring fast tracking. In this thesis, a novel two-stage MPPT technique is proposed. The proposed method combines the well-known perturb and observe (P&O) method and model-based state estimation technique to ensure an accurate and high speed tracking. To validate the proposed MPPT algorithm, a 600 W prototyping circuit is also constructed. Comparing with conventional P&O method and variable step-size P&O method, the tracking speed of the presented method can be improved by 84.6 % and 76 %, respectively. In addition, the tracking energy loss can be improved by 68.48 % and 47.5 %, respectively.
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