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.
