Patent ID: 7952217
Filing Date: 2011-05-31
Classification: F03D,F05B,Y02E

Abstract:
1. A wind turbine comprising: a rotor including one or more pitchable blades, a registrant for registering an idling power producing situation of said wind turbine in relation to a utility grid, a detector for detecting edgewise oscillations in one or more of said blades, and a controller for controlling the pitch angle of one or more of said blades, the controller including a timer for giving of an alarm signal if the size of said edgewise oscillations has not dropped below a predefined level within a predefined period of time, wherein said controller is adapted for changing the pitch angle of one or more of said blades when said registrant registers that said wind turbine is operating in an idling power producing situation and said detector detects edgewise oscillations in one or more of said blades, hereby damping or eliminating said edgewise oscillations.