Motor load reduction in a wind power plant

摘要

A wind power plant is characterized in that a measurement device (18) is provided for the determination of the load on an electric motor (13, 14), wherein the control device (16, 17) reduces the load on the motor (13, 14) by reducing the rotational speed of the rotor (11), by changing the blade angle of the at least one rotor blade (12, 12′) and/or by reducing the output of the wind power plant (10) when a preselectable first load limit of the electric motor (13, 14) is exceeded.

主权项

1. A wind power plant comprising:
a rotor including at least one angle-adjustable rotor blade, an electric asynchronous motor for movement of a nacelle that is carried by a tower of the wind power plant, wherein the rotor is mounted to the nacelle; a control device that controls the electric asynchronous motor; a measurement device for determining a load of the electric asynchronous motor; a motor protection switch integrated with the electric asynchronous motor, wherein the motor protection switch selectively generates a motor protection switch signal when a trigger characteristic line of the motor protection switch is exceeded; and a safety shutdown device that receives the motor protection switch signal from the motor protection switch, wherein the safety shutdown device shuts down the wind power plant upon receipt of the motor protection switch signal, wherein the control device reduces a torsion of the tower when the load exceeds a preselectable first load limit of the electric asynchronous motor by at least one of reducing a rotational speed of the rotor, changing a blade angle of the at least one angle-adjustable rotor blade and reducing a power of the wind power plant, wherein the preselectable first load limit is a characteristic line of values that is less than the trigger characteristic line of the motor protection switch.