Method for controlling a wind turbine

A method for controlling a wind turbine that has a generator that is controlled via a converter in a boost operation, in which an electrical power that is fed into an electrical transmission network is increased by a generative deceleration of the generator, the method comprising:

• using a control to determine a set point value for a generator torque (N*) depending on an actual value of a rotational speed (nmeas);
• applying the determined set point value for the generator torque (N*) to a generator via a limiter with a predefinable upper and lower limit (Nup, Nlow);
• determining the set point value for the generator torque (N*boost) in boost operation that leads to an increased fed-in electrical power (Pinc) in response to a boost signal (flagboost);
• and
• limiting a temporal change of the set point value for the generator torque (dN*/dt) in a recovery operation in response to a recovery signal (flagrec), and further comprising a control with at least one of a P element and a PI element with the recovery signal (flagreco) set that is configured to determine a maximum permissible temporal change of the set point value for the generator torque (dN*/dt) using the temporal change of the rotational speed (dnmeas/dt).

A method for controlling a wind turbine that has a generator that is controlled via a converter in a boost operation, in which an electrical power that is fed into an electrical transmission network is increased by a generative deceleration of the generator, the method comprising:

• using a control to determine a set point value for a generator torque (N*) depending on an actual value of a rotational speed (nmeas);
• applying the determined set point value for the generator torque (N*) to a generator via a limiter with a predefinable upper and lower limit (Nup, Nlow);
• determining the set point value for the generator torque (N*boost) in boost operation that leads to an increased fed-in electrical power (Pinc) in response to a boost signal (flagboost);
• and
• limiting a temporal change of the set point value for the generator torque (dN*/dt) in a recovery operation in response to a recovery signal (flagrec),
• wherein the boost signal (flagboost) is reset when one of a predetermined period of time (Tboost) has elapsed since the boost signal (flagboost) has occurred and the actual value of the frequency (fmeas) in the electrical transmission network is greater than a second predetermined frequency value (freset), and wherein the second predetermined frequency value (freset) is greater than a first predetermined frequency value (ftrigger).