Research On Single-phase Grid Connected Photovoltaic Converter Based On Isolated Cuk Circuit

In this thesis, the method to implement the Single-Phase Grid ConnectedPhotovoltaic Converter, which is used for Low-Power-Level system, is studied.By comparison of different topologies, select Isolated-Cuk converter plus thevoltage-type full-bridge inverter for the system. After selected the topologyparameters by calculation and simulation, the system platform was built. Finally，an active-clamp circle was added into the system to improve system efficiency.First of all，analyze and compare the various PV topologies, and clarify thereasons for the choice of this topology. Select the topology parameters bycalculation and simulation. Accomplished the auxiliary circuit and built thehardware platform.By comparison of different control methods, select and accomplish the maincontrol system. Analyze and select a variety of Maximum Power Point Trackingand Islanding Detection methods. Build the software platform include controlsystem, MPPT, Islanding Detection, sampling and protection system.At last, complete the system loss analysis and select an active-clamp circleto improve system efficiency. Finish the calculation and simulation of thesoft-switching system. Finally, accomplish the debugging of the system, and theexperimental results were analyzed.