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The wind turbines used for power generation should enable to produce maximum power, making best use of available energy in the wind. A specific known terminology: Maximum Power Point Tracking (MPPT) must be introduced to obtain maximum energy efficiency. The strategy from this command is to control the electromagnetic torque to adjust the speed mechanics to maximize the electrical power generated. There are two families from control structures, the strategy from maximizing the power with and without velocity control. The aim of this paper is to evaluate the performances of two types of MPPT controllers mentioned on an 7.5kW test bench containing a DFIG and we interested to compare this two strategies from maximizing the power extracted for a wind generation system with a horizontal axis. The corresponding simulation model are described in section III. The studied MPPT controllers are presented results are given, analyzed and discussed in part IV. Finally, in last part, extracts some conclusions on this paper. [ABSTRACT FROM AUTHOR]

Conversion system of wind energy has become a focal point in the search for renewable energy sources. This article then exhibits a study of the overall operation of a wind generator to provide a constant power or variable the consumer demand while providing services system. In order to provide system services, we consider a variable speed wind turbine coupled to a double-fed induction generator (DFIG) combined with energy storage system. We consider the Flywheel Energy Storage System (FESS) based on fuzzy logic controlled by IM. Due to the use of power converters, the double fed induction generator and the storage system are electrically coupled by a DC bus. Simulation results showing the benefits of using energy storage. [ABSTRACT FROM AUTHOR]