Method and system for controlling a wind turbine to manage edgewise blade vibrations
AssigneeVestas Wind Systems A/S
InventorsThomas Hedegaard BACHMANN, Anders Steen NIELSEN
Life of this patent
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Abstract
A method of controlling a wind turbine for the avoidance of edgewise vibrations. The method comprises the steps of determining a whirling mode frequency of a rotor blade of the wind turbine; determining a rotational frequency of the rotor blade corresponding to the speed of the rotor blade; determining a threshold value for the whirling mode frequency based on the rotational frequency; and, reducing the speed of the rotor blade if the whirling mode frequency substantially equals or is less than the threshold value.
Claims20
A method of controlling a wind turbine for the avoidance of edgewise vibrations, the method comprising:
- determining a whirling mode frequency of a rotor blade of the wind turbine;
- determining a rotational frequency of the rotor blade corresponding to a speed of the rotor blade;
- determining a threshold value for the whirling mode frequency based on the rotational frequency;
- and,
- reducing the speed of the rotor blade if the whirling mode frequency substantially equals or is less than the threshold value.
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A controller for a wind turbine control system, comprising:
- a memory module comprising a set of program code instructions;
- and
- a processor which, when executing the set of program code instructions, implements an operation of controlling a wind turbine for the avoidance of edgewise vibrations, the operation comprising:
- determining a whirling mode frequency of a rotor blade of the wind turbine;
- determining a rotational frequency of the rotor blade corresponding to a speed of the rotor blade;
- determining a threshold value for the whirling mode frequency based on the rotational frequency;
- and
- reducing the speed of the rotor blade if the whirling mode frequency substantially equals or is less than the threshold value.
A wind turbine, comprising:
- a tower;
- a nacelle disposed on the tower;
- a rotor extending from the nacelle and having a plurality of rotor blades disposed on a distal end;
- and
- a controller, comprising:
- a memory module comprising a set of program code instructions;
- and
- a processor which, when executing the set of program code instructions, implements an operation of controlling the wind turbine for the avoidance of edgewise vibrations, the operation comprising:
- determining a whirling mode frequency of a rotor blade of the plurality of rotor blades;
- determining a rotational frequency of the rotor blade corresponding to a speed of the rotor blade;
- determining a threshold value for the whirling mode frequency based on the rotational frequency;
- and
- reducing the speed of the rotor blade if the whirling mode frequency substantially equals or is less than the threshold value.
A computer program product downloadable from a communication network and/or stored on a machine readable medium comprising program code instructions for implementing an operation of controlling a wind turbine for the avoidance of edgewise vibrations, the operation comprising:
- determining a whirling mode frequency of a rotor blade of the plurality of rotor blades;
- determining a rotational frequency of the rotor blade corresponding to a speed of the rotor blade;
- determining a threshold value for the whirling mode frequency based on the rotational frequency;
- and
- reducing the speed of the rotor blade if the whirling mode frequency substantially equals or is less than the threshold value.
Dependencies are inferred from the claim text.