A Doubly Fed Induction Generator for wind stand-alone power applications (Simulation and experimental validation)

The developed strategy presented in this paper deals with a modeling and control of a Doubly Fed Induction Generator (DFIG) for stand-alone power applications. In fact, the magnitude and frequency of the DFIG stator output voltage are controlled under variable mechanical speed. This task is ensured via the control of d and q components of the rotor flux by means of a back-to-back PWM converter connected to the rotor side of the DFIG. The Permanent Magnet Synchronous Machine (PMSM) is coupled mechanically to the wind turbine and supplies a required power to the PWM converter in order to regulate the DC bus voltage to the desired value. A theoretical system analysis with a complete simulation of the overall Wind Energy Conversion System (WECS) is carried out to prove the performances of the control strategy. Finally, experimental validation has been carried out on a 1kW wind system laboratory test-bench and experimental results have been given to confirm the control scheme.