For a large variable speed variable pitch (VSVP) wind turbine, tower damping control is of great significance for extending the operating life and ensuring stable operation of the wind turbine. For this purpose, a feedback control method for damping of tower damper was designed. Based on the analysis and modeling of the tower's forces, the motion equation of the tower system was established, and the reason for the tower vibration was analyzed to obtain the important factors that cause the vibration. The feedback control of the tower damper was designed to suppress the tower vibration. Taking 2 MW wind turbine as an example, the simulation results show that this method can increase the damping of the tower's first-order vibration mode, ensure that the wind turbine has enough stability margin, and reduce the fatigue load of the variable pitch actuator. When the wind turbine is operating above the rated wind speed, the vibration displacement of the tower top and the tower bottom load is effectively reduced, then the life of wind turbine is increased.

Keywords： wind turbine ; vibration ; turbine tower ; damper feedback control ; modal analysis