Siemens Aktiengesellschaft

Ole Kjaer

Per Egedal

Henrik Stiesdal

Soeren Oemann Lind

Martin Winther-Jensen

Mogens Lund

It is described a method for controlling the rotational speed of a rotor of a wind turbine in particular at high wind speeds. The described method comprises (a) determining a rotor acceleration value, wherein the rotor acceleration value is caused by a temporal change of the rotational speed of the rotor, and (b) controlling the rotational speed of the rotor as a function of the rotor acceleration value. It is further described a control system for controlling the rotational speed of a rotor of a wind turbine, a wind turbine being equipped with such a control system and to a computer program, which is adapted for controlling and/or for carrying out the mentioned rotational speed control method.

Rotational speed control of a wind turbine based on rotor acceleration

In one aspect, a system for triggering an emergency system of a wind turbine is described. The system comprises a sensor for sensing an acceleration value of a portion of the rotor of the wind turbine, an estimation unit coupled to the sensor, wherein the estimation unit is adapted for receiving the acceleration value from the sensor and for estimating a rotor rotational speed value of the rotor of the wind turbine based on the acceleration value, and a triggering unit coupled to the estimation unit, wherein the triggering unit is adapted for receiving the rotor rotational speed value and for triggering the emergency system, when the rotor rotational speed value exceeds a predefined limit value. Further described are a method for triggering an emergency system of a wind turbine, a wind turbine, a computer program and a computer-readable medium, which are all adapted for carrying out the triggering method.

System for triggering an emergency system of a wind turbine

A rotational speed controlling device for a wind turbine is provided. The controlling device includes a first input node for receiving a first signal, indicative of an actual rotational speed of the rotor, a second input node for receiving a second signal, indicative of a reference rotational speed for the rotor, a detection unit for detecting a defective operational state in which the wind turbine is impeded to export electrical power to an electricity network, a control unit for providing a reference signal for a characteristic operational parameter of the wind turbine based on the first signal and the second signal, and a pulse generator adapted to send a kick pulse to an integral control element of the control unit in response to the detection of the defective operational state. The characteristic operational parameter is indicative of the rotational speed of the rotor.

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Grindsted, Denmark

Ole Kjaer