Method for stabilising a rotor of a wind turbine
AssigneeVestas Wind Systems A/S
InventorAnders Druedahl Thurlow
Life of this patent
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Abstract
The present invention relates to a method for stabilizing a rotor of a wind turbine during a time period following an abnormal grid event, the method comprising the steps of detecting an occurrence of the abnormal grid event, reducing an allowable rotor thrust from a first thrust limit to a second thrust limit, detecting that the abnormal grid event has ended, and maintaining the second thrust limit a selected time period after the abnormal grid event has ended. The present invention further relates to a wind turbine controller and a computer program product for performing this method.
Claims9
A method for stabilizing a rotor of a wind turbine, the method comprising:
- detecting, by a controller of a wind turbine, an occurrence of a low voltage event;
- setting, by the controller, a maximum allowable thrust of a rotor of the wind turbine in response to detecting the occurrence of the low voltage event;
- in response to detecting that the low voltage event ended, starting, by the controller, a timer;
- maintaining, by the controller, the set maximum allowable thrust of the rotor until the timer has expired;
- and
- increasing the set maximum allowable thrust of the rotor after the timer has expired.
A control system for stabilizing a rotor of a wind turbine, the control system comprising:
- a voltage detector;
- and
- a controller for:
- detecting, based on the voltage detector, an occurrence of a low voltage event;
- setting a maximum allowable thrust of a rotor of a wind turbine during at least part of the low voltage event;
- detecting that the low voltage event ended;
- starting, in response to detecting that the low voltage event ended, a timer;
- maintaining the set maximum allowable thrust of the rotor until the timer has expired;
- and
- increasing the set maximum allowable thrust of the rotor after the timer has expired.
A computer program product comprising a non-transitory computer readable medium storing instructions that, when executed by a microprocessor of a control system of a wind turbine, cause the microprocessor to perform an operation comprising:
- detecting an occurrence of a low voltage event;
- setting a maximum allowable thrust of a rotor of the wind turbine in response to detecting the occurrence of the low voltage event;
- in response to detecting that the low voltage event ended, starting a timer;
- maintaining the set maximum allowable thrust of the rotor until the timer has expired;
- and
- increasing the set maximum allowable thrust of the rotor after the timer has expired.
Dependencies are inferred from the claim text.