La machine asynchrone à double alimentation

Abstract

During the last few years the wind energy conversion system based on Doubly Fed Induction Generator (DFIG) know an impressive growth especially in plants in the MW range because of the several advantages compared to other competing wind energy conversion systems. This manuscript treats the modeling, the control and the simulation of a wind energy conversion system driven DFIG on a 1.5MW. The turbine through a gear box drive the DFIG connected directly to the grid by its stator, but also by back-to-back converter placed between the rotor and the grid. The different components of the conversion chain are modeled. The Power Extraction Technique (MPPT) adjusts the speed of the turbine to the wind speed to maximize power. The wind turbine based DFIG control comprises both the rotor side converter (MSC) and grid side converter (GSC) controllers. The vector control (VC) based on flux stator oriented control, the direct power control (DPC) based on selecting the appropriate rotor voltage vectors and the errors of the active and reactive power, and the combined (VC-DPC) proposed between the VC and DPC for the control of MSC to decoupled active and reactive stator power control exchanged between the machine stator and the grid. The GSC whose main role is to keep the DC link voltage constant, guarantee sinusoidal grid current and the reactive power is set to 0, in order to have a unit power factor in the grid side, the GSC is controlled by the DPC, the control of the generator speed is assured by PI and IP controllers. Simulation results of the complete wind energy conversion chain based on 1.5 MW DFIG with the various strategies used in hypo and hyper synchronous mode using Matlab/Simulink are presented, discussed and demonstrate the effectiveness of the proposed control strategy during variations of wind speed, active and reactive power, robustness, against the machine parameter variations, the dynamic response and power ripple.