Method and control system for controlling a pitch angle of a rotor blade and wind turbine and method for operating a wind turbine

摘要

The invention relates to a method and a control system (16) for controlling an angle of attack of a rotor blade (6) and to a wind energy plant (2) and to a method for operating a wind energy plant (2). The method is characterized in that during the braking process, a time-dependent setpoint speed (S) as a reference variable of a speed controller (18) of the wind turbine (2) is specified, the speed of the rotor (4) of the wind turbine (2) is specified, the Speed of the rotor (4) of the wind turbine (2) is controlled by the speed controller (18), which changes the angle of attack of the rotor blade (6) for controlling the speed.