| Summary: | 博士 === 國立臺灣大學 === 電機工程學研究所 === 90 === Analysis and implementation of a grid connected residential photovoltaic inverter are provided in this work. The PV inverter equipped with solar panels can be viewed as a dispersed generation unit. The rated output power is 4kW, which satisfies general residential electricity consumption. The power circuit of the PV inverter is composed of two stages — the dc/dc boost converter and the full-bridge inverter. This kind of design allows flexible combinations of solar modules. The control circuit is based on a microprocessor.
There are mainly three design goals of a grid connected PV inverter: Maximum power point tracking of solar panels, output current control of the inverter, and islanding phenomenon detection. They are implemented respectively by perturb-and-observe method, deadbeat current control, and automatic phase shift method. This work focuses especially on the delay effect caused by digital control. The predictive current observer based control algorithm successfully solves the problem. The automatic phase shift method, on the other hand, reduces the non-detection possibility of conventional islanding detection techniques. Simulation and experimental results are provided for verification.
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