Wind turbine stabilization

A system for stabilizing an offshore horizontal axis wind turbine having a tower, the system comprising:

• at least one sensor for generating sensor signals representing detected movements of the tower;
• one or more gyroscopes, each gyroscope having three mutually perpendicular axes;
• a spinning axis, an input axis and an output axis, and a flywheel rotatable about the spinning axis, wherein the one or more gyroscopes comprises a first gyroscope;
• one or more gyroscope actuators for each of the one or more gyroscopes, wherein the one or more gyroscope actuators comprises a first gyroscope actuator for the first gyroscope, the first gyroscope actuator being arranged with the first gyroscope in such a way that this first gyroscope actuator can apply a torque about the input axis of the first gyroscope;
• wherein the one or more gyroscope actuators comprises a second gyroscope actuator arranged with the first gyroscope in such a way that this second gyroscope actuator can apply a torque about the output axis of the first gyroscope;
• and
• a control unit for receiving the sensor signals representing detected movements of the tower, and for providing the first gyroscope actuator with suitable control signals for the first gyroscope actuator to apply a torque about the related first gyroscope input axis, the torque about the input axis producing a torque about the output axis of the first gyroscope that at least partly dampens the detected movements of the tower and
• providing the second gyroscope actuator with suitable control signals for the second gyroscope actuator to apply a torque about the output axis of the first gyroscope, the torque about the output axis of the first gyroscope causing a torque about the input axis of the first gyroscope that at least partly dampens the detected movements of the tower;
• wherein the control unit is adapted to alternatively provide, depending on the detected movements of the tower, the suitable control signals to the first gyroscope actuator or to the second gyroscope actuator of the first gyroscope.