Abstract: A method for control of a wind power installation which is connected to an electrical supply network and which has a rotor with rotor blades which are adjustable in terms of their blade angle, is able to be operated at a variable speed and is prepared for generating an installation power from wind, wherein a blade angle control is provided for adjusting the blade angles, a closed-loop speed control is provided for closed-loop control of the speed, a closed-loop power control is provided for limiting the installation power, and the wind power installation is able to be operated at an operating point which can be specified, wherein the operating point is characterized at least by the speed and the installation power comprises operating the wind power installation at a first operating point with a first blade angle, checking for a curtailment request, where a reduction in the speed and/or installation power is requested, and if there is a curtailment request, determining a new operating point as the target opera

Abstract: Method for controlling a wind power installation (100) which has rotor blades (108) whose blade angle is adjustable and which can be operated at a variable speed using speed control, wherein the speed control is prepared to control the speed to a variable target speed value, comprising the steps of evaluating a test criterion for predicting an emerging overspeed, predicting an overspeed (nU) on the basis of the at least one test criterion, and changing the speed control if an overspeed (nU) has been predicted. Proposed are techniques that avoid an excessive increase in the rotor speed even in the event of strong wind speed increases. In particular, proposed are techniques that avoid reaching an overspeed that leads to shutdown, but without increasing the operating loads too much.