الفهرس 
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Abstract
Interest in renewable energy sources and their integration into the electricity grid has grown over the past several years. In fact, the production of wind energy has received a lot of attention. The annual growth of grid-connected wind turbines raises various challenges for power grids. Improving the control of Wind Turbines (WT) has a very important mission in ensuring their excellent performance. Due to these factors, the study covered in this thesis aims to enhance the effectiveness of the controllers installed in grid-connected wind turbines so that they can fulfil grid requirements.
In this study, two different control strategies are presented and compared to the performance of the conventional Proportional-Integral (PI) controllers of the Grid Side Converter (GSC) and the Rotor Side Converter (RSC) installed in the Doubly Fed Induction Generator (DFIG). The first control strategy involves applying several optimization techniques to the installed PI controllers, including Local Unimodal Sampling (LUS), Harmony Search Algorithm (HSA), and Equilibrium Optimization (EO). The second control strategy involves replacing the PI controllers with Fuzzy Logic Controllers (FLC).
The results are obtained by performing simulation analyses using MATLAB/Simulink software. The ability to regulate the output active power under a varied wind speed profile serves as the primary comparative criterion. First, the results of the unoptimized PI controllers are compared with those resulting from the use of the different optimization techniques. Results demonstrate how effective EO is at enhancing system performance. After that, the FLC is used instead of the PI controller. The FLC results and the EO results are compared. The FLC shows its superiority in providing a wide scope of control under rapid variations in wind speed.
A robustness test is conducted by evaluating how the various control techniques respond to various wind speed profiles and challenging operational circumstances, including: No fault condition, One-line to ground fault, Two-line to ground fault, and Three-line to ground fault. Under various fault circumstances and with various wind speed profiles, the FLC exhibits the best dynamic performance.