Patent ID: 8487462
Filing Date: 2013-07-16
Classification: F03D,F05B,Y02E

Abstract:
1. 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; in response to the operational settings reaching the second state, operating the wind turbine with the operational settings in the second state during the fault event; and in response to the utility grid recovering from the fault event, 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 in dependency of a fixed control value as the operating settings of the wind turbine are changed from the second state.