Modeling and Control of a Doubly Fed Induction Generator Using a Back-to-Back Converters in Grid Tied Wind Power System

The demand of energy is drastically increasing now days mainly in developing countries like Ethiopia. In connection, wind energy is one of the promising renewable energies sources with the most commonly used Doubly Fed Induction Generator (DFIG). The DFIG's stator is directly connected to the grid, whereas the rotor is tied via dual back-to-back Pulse Width Modulation (PWM) converters. Its active and reactive power can be controlled independently using converters as per the demand of system operators or grid code requirements. The PWM strategy has a capacity of giving higher converter output voltage by high switching frequency modulation process. Thus, this paper models the DFIG and uses PWM to control the power flow at rotor and grid sides independently. MATLAB-Simulink software is used for modeling and simulation. Finally, conclusions are drawn.