| Summary: | 碩士 === 國立成功大學 === 電機工程學系 === 102 === In this thesis, a photovoltaic (PV) gird-connected micro-inverter controlled by power factor correction (PFC) controller is implemented. The PFC controller is adopted to control output sinusoidal current of an inverter. Besides, the maximum power point tracking control circuit can retrieve the maximum power form PV modules. The duality between the PFC circuit and the inverter circuit is first presented. Accordingly, the PFC design rules is applied in the inverter circuit. However, the flyback inverter controlled by boundary conduction mode PFC IC will cause a high third harmonic component from the analysis. Hence, the third harmonic injection method is adopted by simulation software to improve the output current total harmonic distortion. Finally, a 300W grid-connected flyback micro-inverter with boundary conduction mode control based on L6561 PFC controller is implemented to verify the feasibility. Input voltage is 20V to 40V and the peak power is 300 W from PV simulator, and the output voltage is 220Vac/60Hz. The highest efficiency of the micro-inverter is 92.8%.
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