الفهرس 
CHAPTER ONE INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
The fast growth of wind generation has led to concern about the effect of wind power on the stability of the electric grid. As the amount of wind power is increasing drastically in the coming years, maintaining power system stability. Thus, grid faults will be more important to be analyzed in order to ensure power supply reliability.
This thesis deals with negative impacts of the grid faults in the Doubly Fed Induction Generators (DFIG) based wind turbines systems include the stator and rotor over currents, DC-link over voltage, electromagnetic torque oscillations, active and reactive power fluctuations at the grid connection point, potentially leading to destabilization of the electric grid. The study proposes a comprehensive study about the performance analysis of a 1.5 MW DFIG-based wind turbine in order to stay connected to the grid under the symmetrical and asymmetrical grid faults.
In this concern, the study discusses and compares the simulations of two proposed protection schemes to limit the negative impacts of the grid connected faults. The investigated protection schemes are simple in construction and cost efficient. The performance of the DFIG is highly improved during the grid faults, and can be very effective to stabilize a grid connected wind turbine. The simulation results confirmed the effectiveness of these schemes.