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Optimization and Control of a Wind Energy Conversion System (WECS) Based on a Dual-Fed Induction Generator (DFIG) to Improve Wind Turbine Efficiency

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This study is focused on the optimization and the control of a wind energy conversion system (WENS) by using Matlab/Simulink. It is based on a dual-fed induction generator (DFIG) connected to the fixed grid frequency through a back-to-back converter. The main objective is to develop a numerical model to extract the maximum energy power during the operation of the wind system, by presenting different strategies for controlling the electrical and the mechanical parameters of the wind-generated system. The Pitch Command has been used to control and limit the aerodynamic power in strong wind. The Maximum Power Point Tracking “MPPT” strategy consists of extracting the maximum power from the wind turbine and injecting it into the grid. The control of the Grid Side Converter (GSC) and the Rotor Side Converter (RSC) enables the adjustment of the reactive and active power according to the instructions determined by the grid manager. Vector control by orientation of stator flux of the generator has been applied to the independently control the reactive and active power between the network and the machine. The results of this research reveal the relevance of optimizing energy transfer in a wind power system. It proves that the control strategies used have a significant impact on the energy efficiency of the wind-generated system used.
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Wind Energy Conversion System (WENS); Dual-Fed Induction Generator (DFIG); Vector Control; Control Pitch; Maximum Power Point Tracking (MPPT)

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