Method for determining a wind speed in the region of a wind turbine, and a wind turbine for performing the method

Patent metadata

Field	Value
Publication number	US-12203449-B2
Application number	US-202017623422-A
Country	US
Kind code	B2
Filing date	Jul 1, 2020
Priority date	Jul 4, 2019
Publication date	Jan 21, 2025
Grant date	Jan 21, 2025

Abstract

A method of determining a corrected wind speed in the region of a wind turbine including the steps of measuring a wind speed in the region of a wind turbine, determining a force exerted on at least one rotor blade by the wind, determining a wind speed difference value which is dependent on the determined force and determining a corrected wind speed by correcting the measured wind speed in dependence on the wind speed difference value.
A wind turbine for carrying out the method.

First claim

The invention claimed is:

1. A method of determining a corrected wind speed of a wind turbine, the method comprising:
measuring a wind speed in a region of the wind turbine, wherein measuring the wind speed includes:
measuring the wind speed at a first distance windward of the wind turbine or at a first position

determining a force exerted on at least one rotor blade from wind,
establishing a second distance at the windward side of the wind turbine or a second position at which the corrected wind speed is to be determined, wherein:
the second distance is a windward distance, or
the second position is in a region outside a near field region of the wind turbine,

determining a wind speed difference value, wherein the wind speed difference value depends on:
the determined force,
the first distance or the first position, and
the second distance or the second position, and

determining the corrected wind speed by correcting the measured wind speed in dependence on the wind speed difference value.

2. The method as claimed in claim 1 wherein the first distance is defined as a distance within the near field region of the wind turbine or the first position is defined as a position which is within the near field region.

3. The method as claimed in claim 2 , wherein the first distance is a distance from the wind turbine chosen from at least one of the following:
40 meters,
60 meters,
90 meters,
between 0 and 40 meters,
between 40 and 60 meters, or
between 60 and 90 meters.

4. The method as claimed in claim 1 wherein measuring the wind speed comprises using a lidar system to measure the wind speed.

5. The method as claimed in claim 1 wherein determining the corrected wind speed outside the near field region comprises using a table or function with the corrected wind speed and the corresponding measured wind speed.

6. The method as claimed in claim 1 wherein the wind speed difference value is determined in dependence on the determined force being converted into the wind speed difference value by at least one stored function or at least one stored table.

7. The method as claimed in claim 1 wherein determining the wind speed difference value further depends on the rotary speed and/or blade position.

8. The method as claimed in claim 1 wherein correcting the measured wind speed depends on the wind speed difference value being subtracted from or added to the measured wind speed.

9. The method as claimed in claim 1 wherein determining the force exerted on at least one rotor blade by the wind comprises using measurement values from at least one sensor arranged in or at at least one rotor blade, wherein the at least one sensor is a measuring device for detecting, extending, or compressing deformations.

10. The method as claimed in claim 9 further comprising:
the at least one sensor for determining a force exerted on at least one rotor blade by the wind is calibrated before determining the force, and
rotating the at least one rotor blade by moving the rotor blade to a plurality of different positions, and
repeating the steps of determining the force, determining the wind speed difference value, and determining a corrected wind speed at each position of the plurality of different positions.

11. The method as claimed in claim 10 , wherein the different positions include at least one position chosen from a 3 o'clock position, a 6 o'clock position, or a 9 o'clock position.

12. The method as claimed in claim 9 , wherein the at least one sensor includes at least one or more sensors chosen from a strain gauge, a pressure sensor, an optical pressure sensor, or a camera.

13. The method as claimed in claim 1 comprising setting a torque by setting an exciter current of a generator of the wind turbine in dependence on the determined wind speed.

14. The wind turbine comprising a circuitry and one or more sensors to carry out the method as claimed in claim 1 .

15. The wind turbine as claimed in claim 14 wherein the one or more sensors includes a lidar system for measuring the wind speed and at least one sensor arranged in or on the at least one rotor blade for determining the force exerted on the at least one rotor blade by the wind.

16. The method as claimed in claim 1 wherein the near field region is defined as a region within a radius around the wind turbine, wherein the radius corresponds to a diameter of the rotor of the wind turbine.

17. The method as claimed in claim 1 wherein the near field region is defined as a region within a radius around the wind turbine, wherein the radius is at least two times the diameter of the rotor of the wind turbine.

Assignees

• Wobben Properties Gmbh

Inventors

• Seifert Benjamin

Classifications

• F05B2270/328

  Blade pitch angle · CPC title

• F05B2270/32

  Wind speeds · CPC title

• F03D7/028

  controlling wind motor output power · CPC title

• F03D7/0224 Primary

  Adjusting blade pitch · CPC title

• Y02E10/72

  Wind turbines with rotation axis in wind direction · CPC title