الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
Wind energy is considered as one of the clean and renewable energy sources that can be used in the extraction of electric energy. This draws attention to increase the usage of such energy for electricity generation. The operation of Wind Energy Conversion System (WECS) introduces power quality challenges. These challenges motivate many researchers to overcome these power quality issues especially total harmonic distortion. In this work, the impact of connecting wind farms with different conversion systems on the quality of the produced power was studied. In the first part of the thesis, the power quality criteria will be presented focusing on the harmonics emissions, then the international standard IEEE519-2014, IEC 61400-21 and the national Egyptian wind farm grid connection code are presented. The Second part discusses wind energy conversion systems in details. The various types of wind turbines are studied. The different technologies of the commonly used generators in converting rotational energy of the wind to electrical power energy are also discussed showing the merits and demerits of each. Then, some optimization techniques were introduced, selecting the Particle Swarm Optimization technique (PSO) as one of the most important and frequent used technique. This technique is used in our work for optimizing the controllers’ gains.
After that, the static compensation devices are clarified as one of the modern power conditional devices. These devices are able to perform voltage and reactive power regulation in order to enhance the performance of wind farms and compensate reactive power consumption from the grid. In this work, two of them are evaluated and compared, namely Static Synchronous Compensator (STATCOM) and Static Var Compensator (SVC).
WECS has been modeled in MATLAB/Simulink, with the use of Doubly Fed Induction Generator (DFIG) and Synchronous Generator (SG) as two alternative scenarios recently used and with the modeling of the whole power grid as groups of step-up transformers, feeding lines and bus bars. Their response is studied together with the case when static compensation devices are implemented as compensation techniques.
The major contributions of this thesis are: (i) providing comprehensive comparative study for different types of generators in WECS, (ii) application of PSO technique in controllers’ gains tuning and (iii)The compensation devices are optimally used to study their effect on the total harmonic distortion index measured at the point of grid connection.