الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
Electrical energy is one of the crucial inputs for social-economic development. The rate at which the electrical energy is being consumed by a nation often reflects the level of prosperity that it could achieve. Due to finite of the fossil fuels, the environmental pollutions and the increasing of the energy demand day by day, the utilization of the renewable energy are imperative necessity. Among the renewable power sources, wind power has recently experienced a rapid growth around the world, and it is on track to supply 20% of global electricity demand by 2020. Renewable energy sources including wind power generation introduce a well feasible solution to distributed power generation where electric grids aren’t available. At present, scenario of wind power generation is considered as one of the most promising applications of renewable energy generation lies in the development of continuous power supply for remote village that lack an economically feasible means of connecting to the main electric grid. Mostly of the used generators as the wind is variable and has unpredictable nature. The doubly-fed induction generator (DFIG) is the most important for getting that energy. It has the ability to improve efficiency, reduce cost and losses, correct the power factor, give a variable speed and control of both active and reactive power. In this thesis, the main objectives are to build a detailed mathematical model in MATLAB/SIMULINK for a single diagram of doubly-fed induction generatorwind energy conversion system (DFIG-WECS). The system consists of six1.5MW wind turbines which export power to120 kV grid through a 30 km, 25 kV feeder. Also, presents a complete comparative analysis of proportional integral (PI), proportional integral derivative (PID) designed using ziegler nichols (Z-N) method, fuzzy controller one by one and hybrid fuzzy logic PID Controller (HFLC+PID) during different applications such as voltage dip and three phases to ground fault. Finally, the particle swarm optimization technique is implemented to tune all controller`s gains. This study aims to control the output power supplied to the grid. Controllers are used in rotor side converter (RSC) to control the rotor active power and reactive power and controllers in grid side converter (GSC) to control dc link voltage to maintain it constant and control active power and reactive power connected of the grid. It is concluded from the simulation results that the optimized controllers are more effective for enhancing the system performance of wind farm connected to grid during different disturbances compared with conventional controllers.