| Summary: | 碩士 === 明新科技大學 === 電機工程研究所 === 97 === Due to the characteristic of photovoltaic (PV) modules with nonlinear voltage-current relation and variation of the maximum power point (MPP) with respect to irradiation and temperature, a maximum power point tracking (MPPT) techniques is commonly used in PV systems to maximize the power drown from PV systems under varying atmospheric conditions. Among the MPPT techniques, perturb and observe (P&O) MPPT algorithm is the most commonly used method due to its ease of implementation. However, a drawback of the conventional P&O MPPT technique is that, at steady state, the operating point oscillates around the MPP giving rise to the waste of some amount of available energy; moreover, it is well known that the P&O algorithm can be confused during those time intervals characterized by rapidly changing atmospheric conditions. In this thesis, a study on the P&O algorithm for PV systems is presented to limit the negative effects associated to the above drawbacks. Simulation and experiment results are included to verify the validity and reliability of the extended P&O algorithms.
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