الفهرس 
Control of WECS using doubly- fed induction generator
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Abstract
As well-known that the traditional sources of electrical energy are the fossil fuels which cause environmental damages. This fact, limited reserves and the price of fossil fuels which increases dramatically are the reasons for the global interest in renewable energy resources. Over the last two decades, there has been a large penetration of renewable energy generation into the power supply network. The world trend now is to decrease the dependency on the conventional generation of electric power and increase the utilization of sustainable energy resources like wind, biomass, solar power, hydro- electric, etc. in the electric grid. The need for integration of such kind of energy resource into the power system is to make it possible to decrease the environmental impact of conventional power plants. The wind energy market has grown rapidly in the last few years. The global installed capacity of wind power was increased exponentially from approximately 17.4 GW in 2000 to around 432.883 GW by the end of 2015. The main advantage of DFIG system for WECS is that it offers separate real and reactive power controller, like a synchronous generator, even though the ability to run asynchronously. Another advantage is that the back-to-back power converter doesn{u2019}t have to handle the system rated power, it just handles a fraction of the total generator power depending on the selected speed range. The typical speed range of this system is ±30% around the synchronous speed. This thesis provides the complete design of DFIG-based WECS. This system is consisted of three parts the GSC, PMSM for wind emulation and the RSC which drive the DFIG. The performance of the system has been studied in the simulation and the experimental work using different types of controllers (PI-controller, MRAC and L1 adaptive controller)