| Summary: | 碩士 === 清雲科技大學 === 電機工程研究所 === 95 === A grid connected PV system, which consists of PV modules, a maximum power point tracking (MPPT) controlled boost converter to let the PV module operate at MPPs with respect to different insolation changes and a current controlled full bridge inverter with LCL filter to inject sinusoidal current into utility, is proposed in this thesis. The MPPT control method is derived from incremental conductance (InCond) method and the tracking and regulation behaviors to keep the PV module operated at MPP. As a result, the designed MPPT can track insolation change quickly than the integrated InCond and perturbation & observation (P&O) method via the same hardware implementation. Then, the generated DC energy of the PV modules is converted to injected sinusoidal current into utility through the grid connected inverter. This inverter has an inner current control loop to let inductor current track its referent sinusoidal current closely and an outer voltage controller to generate the injected current command with respect to insolation intensity. Furthermore, an insolation simulator was built to generate various insolation patterns through microprocessor. With the help of the insolation simulator, the limitation of the nature environment is removed and can do all the experiments in side the libratory. Finally, some simulations and experimental results are provided to demonstrate the effectiveness of the designed grid connected PV system.
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