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Wind Turbine MPPT Strategy with DFIG Vector Control

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This paper deals with modelling, simulation and analysis of a wind turbine operating at variable speed. The overall system functioning and its control are illustrated by the transient and the permanent power control responses of the Doubly Feed Induction Generator (DFIG).In this structure, the DFIG stator is connected directly to the electrical network which imposes its voltage and angular frequency ωr. The tree phases wound rotor accessed is also connected to the power line through two converters in order to reversibly transit the rotor powers and adjust the rotor angular frequency. In this way it is possible to operate the generator in a large speed range around the synchronous speed and in both hypo-synchronous and hyper synchronous modes while providing MPPT for each wind speed profile. The rotor side converters are dimensioned for lower powers nominal thus reducing their cost. This paper discusses the case where the blade pitch angle is kept constant and it is equal to zero. This study includes the speed range where the MPPT algorithm could be used. Simulations have been performed in the case of a DFIG having a synchronism speed equal to 1500 tr/min, the obtained results show that the maximum power point is reached for a wind speed close to 11 m/s.
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MPPT; P&O Algorithm; DFIG; Wind Turbine; PWM Inverter; PARK Transformation; Power Coefficient; MATLAB Simulink

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