Patent ID: 11939959
Assignee: VESTAS WIND SYSTEMS A/S
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F  Y | IPC F

Claim 12:
13. A wind turbine comprising a control system and a rotor with one or more pitch adjustable rotor blades, the control system comprising one or more controller units arranged to:
store pitch angles for each of the pitch adjustable rotor blades, the pitch angles being sequentially sampled continuously across at least a fraction of a revolution of the rotor for each rotor blade;
generate a stored pitch angle signal for the one or more pitch adjustable rotor blades from the stored pitch angles;
determine at least one periodic component of the stored pitch angle signal;
generate a rotor stop signal to stop the rotor; and
in response to generating the rotor stop signal, control the pitch adjustable rotor blades towards a feathering position using a pitch control signal containing the at least one periodic component.