Patent ID: 7911072

Claim:
A method for controlling a wind turbine connected to a utility grid, the method comprising: operating the wind turbine with operational settings in a first state; in response to a fault event in the utility grid, controlling one or more rotor blades of the wind turbine or power generated by the wind turbine to the utility grid to change the operational settings of the wind turbine from the first state to a second state that avoids overspeeding of a rotor of the wind turbine; measuring values of mechanical oscillations of the wind turbine or loads of the wind turbine; and in response to the utility grid recovering from the fault event, controlling the one or more rotor blades of the wind turbine or the power generated by the wind turbine to the utility grid by reapplying thrust in counter phase to the mechanical oscillations or the loads of the wind turbine to compensate for the mechanical oscillations of the wind turbine or the loads of the wind turbine as the operational settings of the wind turbine are changed from the second state.