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US 11,220,996 B2Granted
Control method for a wind turbine
AssigneeVestas Wind Systems A/S
InventorJohnny Nielsen
Life of this patent
Estimating the term…
Abstract
A wind turbine includes at least one wind speed sensor, a number of pitch-adjustable rotor blades, and a control system for changing the pitch of the rotor blades and/or a generator torque. The the control system determines at time intervals an error parameter as the difference between an estimated wind speed and a measured wind speed as measured by the wind speed sensor. Then, based on a number of pre-defined wind speed intervals, a group of error parameters is obtained over time for each wind speed interval. For each wind speed interval and for each group of error parameters a wind speed offset is determined based on the average of the error parameters within the group which wind speed offsets are used in adjusting the measured wind speed.
Claims15
A method of controlling a wind turbine, the wind turbine comprising at least one wind speed sensor, a plurality of pitch-adjustable rotor blades, and a control system for changing at least one of a pitch of the plurality of rotor blades or a generator torque, the method comprising:
- obtaining a plurality of wind speed intervals;
- determining, for a first wind speed interval of the plurality of wind speed intervals, a first plurality of differences, wherein each of the first plurality of differences is between (i) a respective first wind speed measured by the at least one wind speed sensor and falling within the first wind speed interval and (ii) a respective first estimated wind speed that is estimated at a time corresponding to when the respective first wind speed was measured;
- determining, for a second wind speed interval of the plurality of wind speed intervals, a second plurality of differences, wherein each of the second plurality of differences is between (i) a respective second wind speed measured by the at least one wind speed sensor and falling within the second wind speed interval and (ii) a respective second estimated wind speed that is estimated at a time corresponding to when the respective second wind speed was measured;
- averaging the first plurality of differences to produce a first wind speed offset for the first wind speed interval;
- averaging the second plurality of differences to produce a second wind speed offset for the second wind speed interval;
- upon determining that a third wind speed measured by the at least one wind speed sensor falls within the first wind speed interval, adjusting the third wind speed based on the first wind speed offset rather than the second wind speed offset to correct for a disturbance disruption to the third wind speed caused by rotation of the plurality of rotor blades and to produce an adjusted wind speed;
- determining a control parameter of the wind turbine as a function of the adjusted wind speed;
- and
- controlling the wind turbine according to the control parameter.
6 more elements
A control system for a wind turbine comprising at least one wind speed sensor and a plurality of pitch-adjustable rotor blades, the control system being configured to:
- obtain a plurality of wind speed intervals;
- determine, for a first wind speed interval of the plurality of wind speed intervals, a first plurality of differences, wherein each of the first plurality of differences is between a respective first wind speed measured by the at least one wind speed sensor and falling within the first wind speed interval and (ii) a respective first estimated wind speed that is estimated at a time corresponding to when the respective first wind speed was measured;
- determine, for a second wind speed interval of the plurality of wind speed intervals, a second plurality of differences, wherein each of the second plurality of differences is between (i) a respective second wind speed measured by the at least one wind speed sensor and falling within the second wind speed interval and (ii) a respective second estimated wind speed that is estimated at a time corresponding to when the respective second wind speed was measured;
- average the first plurality of differences to produce a first wind speed offset for the first wind speed interval;
- average the second plurality of differences to produce a second wind speed offset for the second wind speed interval;
- upon determining that a third wind speed measured by the at least one wind speed sensor falls within the first wind speed interval, adjust the third wind speed based on the first wind speed offset rather than the second wind speed offset to correct for a disturbance to the third wind speed caused by rotation of the plurality of rotor blades and to produce an adjusted wind speed;
- determine a control parameter of the wind turbine as a function of the adjusted wind speed;
- and
- control the wind turbine according to the control parameter.
6 more elements
A wind turbine, comprising:
- a tower;
- a nacelle disposed on the tower;
- a rotor extending from the nacelle;
- a plurality of pitch-adjustable rotor blades connected to the rotor;
- a wind speed sensor;
- and
- a control system configured to:
- obtain a plurality of wind speed intervals;
- determine, for a first wind speed interval of the plurality of wind speed intervals, a first plurality of differences, wherein each of the first plurality of differences is between (i) a respective first wind speed measured by the wind speed sensor and falling within the first wind speed interval and (ii) a respective first estimated wind speed that is estimated at a time corresponding to when the respective first wind speed was measured;
- determine, for a second wind speed interval of the plurality of wind speed intervals, a second plurality of differences, wherein each of the second plurality of differences is between (i) a respective second wind speed measured by the wind speed sensor and falling within the second wind speed interval and (ii) a respective second estimated wind speed that is estimated at a time corresponding to when the respective second wind speed was measured;
- average the first plurality of differences to produce a first wind speed offset for the first wind speed interval;
- average the second plurality of differences to produce a second wind speed offset for the second wind speed interval;
- upon determining that a third wind speed measured by the wind speed sensor falls within the first wind speed interval, adjust the third wind speed based on the first wind speed offset rather than the second wind speed offset to correct for a disturbance to the third wind speed caused by rotation of the plurality of rotor blades and to produce an adjusted wind speed;
- determine a control parameter of the wind turbine as a function of the adjusted wind speed;
- and
- control the wind turbine according to the control parameter.
13 more elements
Dependencies are inferred from the claim text.