Reduction of wind turbine tower oscillations based on individual pitch control

The use of wind power has been increasing rapidly over the last few decades and according to all predictions this trend is likely to continue. At the same time, the need for better cost effectiveness of wind power plants has stimulated growth in wind turbines´ size and rated power, thus making wind turbine structure very flexible. Therefore an advanced control system must be used to reduce structural loads and fatigue and enable optimal wind energy conversion in a wide range of wind speeds. One such control system, with emphasis on reduction of wind turbine structural oscillations, is developed in this paper.