Patent ID: 8206105
Filing Date: 2012-06-26
Classification: F03D,F05B,Y02E

Abstract:
1. A control method that controls load reduction for a wind turbine rotor with rotor blades comprising an aerodynamic active element responsive to a control signal for modifying a setting of the respective element, the method comprising: detecting the loads acting on the rotor blades in relation to the azimuth of the rotor; establishing control signals based on a PI-control system, correcting the angle of the complex number by a phase correction factor; and providing the aerodynamic active elements with the respective control signal, wherein the input to the PI-control system is a complex load vector; wherein the number of complex vector components of the complex load vector corresponds to the number of rotor blades, wherein the amplitude of a vector component defines the magnitude of the load acting on the respective blade and the angle of the vector component defines the phase of the load with respect to the azimuth of the rotor, and wherein the load vector is multiplied with the phase correction factor prior to being input to the PI-control system.