Dynamic behaviour of a multi-MW wind turbine

The paper presents an investigation into the effects of wind and grid conditions on the dynamic behaviours and the interactions between the electrical, mechanical and control components of a 3MW variable-speed wind turbine. All the components of the drivetrain have been modelled with sufficiently high fidelity, and it has been shown that extreme wind and grid conditions, such wind turbulence and grid voltage sag, can have significant effects on the conditions exhibited by the gearbox, for example. Furthermore, it has also been shown, that despite the fact that the turbine is connected to the grid through a full power converters, a grid voltage sag can expose the mechanical components of the drivetrain to load reversals and oscillations.