Two Stage Three-Phase Grid-Connected Hybrid Photovoltaic-Wind System

This paper aims to present the design and the control structure of a grid-connected hybrid system consisting of the photovoltaic and the wind generation subsystems. To obtain the maximum power from the subsystems during the varying climatic conditions Maximum Power Point Tracking method is used. The generation system is interfaced with the grid through an inverter. The control strategy implemented in the system regulates the DC-link voltage, controls the power fed into the grid and maintains a constant grid voltage. The control mechanism is implemented in the rotating d-q reference frame. A phase-locked loop has been used for grid synchronization. Grid synchronization is an important task that has to be performed to enable both the systems exchange the AC power. The modeling and simulation of the proposed system is done in MATLAB/Simulink.