Patent ID: 11920564
Assignee: SIEMENS GAMESA RENEWABLE ENERGY A/S
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F  Y | IPC F

Claim 0:
1. A method of controlling aerodynamic properties of a blade of a wind turbine, the blade comprising a predetermined number of add-on members which are actuated by a corresponding trim actuator to alter the aerodynamic properties of the blade, wherein each trim actuator is configured to hold an add-on member in a predetermined first position and a predetermined second position; wherein the method comprises:
determining a first number of add-on members which are to be held at the predetermined first position, and determining a second number of add-on members which are to be held at the predetermined second position, without receiving feedback from a sensor about positions of the first number of add-on members and the second number of add-on members; and
actuating the first number of add-on members and the second number of add-on members with a trim activation signal in a digital on/off manner so that the first number of add-on members and the second number of add-on members only transition between a fully open position and a fully closed position.