Investigation of grid-structure interaction of wind turbine driven DFIG using FAST and Simulink

This paper presents the study of the interaction of the electrical dynamics with the structure of the wind turbine. A grid connected Doubly Fed Induction Generator (DFIG) based wind energy conversion system has been considered for the investigation. The dynamical structure of the blade and tower of the wind turbine has been modelled by using Euler-Lagrangian approach while the input mechanical power to the wind turbine and the wind loading on the turbine blades and tower was derived by the Blade Element Momentum (BEM) method considering the aerodynamic properties of the blades. The results obtained from the time-domain simulation offer a deep understanding of the combined interaction of electrical, mechanical structural and aero-dynamical aspect of wind turbine generator system and may further be used to design various control schemes. The model has been validated using NREL's simulation tool, FAST (fatigue, aerodynamics, structures and turbulence) and TurbSim. The structural and aerodynamic data of NREL's 5-MW baseline wind turbine were used for the simulation.