Simulation and Modeling of a Three-Phase Two- Stage Grid Connected Photovoltaic System
نویسندگان
چکیده
Grid connected photovoltaic (PV) systems feed electricity directly to the electrical network operating parallel to the conventional source. This paper deals with the design and simulation of a three phase inverter in MATLAB SIMULINK environment which can be a part of photovoltaic grid connected systems. This paper at first presents a control algorithm for a three-phase gridconnected photovoltaic system in which an inverter designed for grid-connected photovoltaic arrays can synchronize a sinusoidal current output with a voltage grid. The main points discussed here are the MPP tracking algorithm, the synchronization of the inverter and the connection to the grid. Tracking the dc voltage and current allows MPP calculation which gives the inverter to function efficiently. We apply the MPP equations to the PV array model and watch the inverter input and output. In order to synchronize the simulated inverter to the grid the waveforms from the grid are applied to the pulse width modulation (PWM) input and drive appropriately the inverter’s IGBT’s. A MATLAB/SIMULINK based simulation model is developed for the system. Simulation results are presented to show the overall system performance.
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