Method and system for calibrating a wind vane

Patent metadata

Field	Value
Publication number	US-2019360468-A1
Application number	US-201916279191-A
Country	US
Kind code	A1
Filing date	Feb 19, 2019
Priority date	Feb 19, 2018
Publication date	Nov 28, 2019
Grant date	—

Abstract

A method and a system for calibrating a wind vane of a wind turbine, a method for monitoring a wind turbine, and a method for operating a wind turbine are provided. The method comprises: measuring a first wind speed by means of a first anemometer, a second wind speed by means of a second anemometer, and a wind direction by means of the wind vane, a multiplicity of measurement values being recorded over a defined time period; determining differences between the first wind speed and the second wind speed at least substantially at the same instants in each case; determining a model function for a relationship between measured wind directions and determined differences that correspond at least substantially to the same instants, at least one first model function being determined for a first wind-speed bin and at least one second model function (being determined for a second wind-speed bin; determining at least one intersection point value of the measured wind direction at which the first model function and the second model function intersect; and outputting the intersection point value as an installation angle of the wind vane.

First claim

What is claimed is:

1 . A method for calibrating a wind vane of a wind turbine that is arranged, together with two anemometers, on a leeward side of a rotor of the wind turbine, comprising:
measuring a first wind speed by means of a first anemometer, a second wind speed by means of a second anemometer, and a wind direction by means of the wind vane, a multiplicity of measurement values being recorded over a defined time period; determining differences between the first wind speed and the second wind speed at least substantially at the same instants in each case; determining a model function for a relationship between measured wind directions and determined differences that correspond at least substantially to the same instants, at least one first model function being determined for a first wind-speed bin and at least one second model function being determined for a second wind-speed bin; determining at least one intersection point value of the measured wind direction at which the first model function and the second model function intersect; outputting the intersection point value as an installation angle of the wind vane.

2 . A method for calibrating a wind vane of a wind turbine that is arranged, together with two anemometers, on a leeward side of a rotor of the wind turbine, comprising:
measuring a first wind speed by means of a first anemometer, a second wind speed by means of a second anemometer, and a wind direction by means of the wind vane, a multiplicity of measurement values being recorded over a defined time period; determining differences between the first wind speed and the second wind speed at least substantially at the same instants in each case; determining a model function for a relationship between measured wind directions and determined differences that correspond at least substantially to the same instants, for a wind-speed bin; determining a value of the measured wind direction at which the model function assumes a predefined difference value, in particular at least substantially zero; and outputting the determined value as an installation value of the wind vane.

3 . The method according to claim 1 , the model on which the model function is based being linear.

4 . The method according to claim 1 , the model function being determined on the basis of a compensation calculation, in particular a regression analysis.

5 . The method according to claim 1 , more than two model functions being determined, and the installation angle of the wind vane being output as a mean value from a plurality of determined intersection point values of the measured wind direction, at which respectively two model functions for different wind-speed bins intersect.

6 . The method according to claim 1 , the multiplicity of measurement values generated by the first anemometer being corrected with a first correction function, for the purpose of measuring the first wind speed, and/or the multiplicity of measurement values generated by the second anemometer being corrected with a second correction function, for the purpose of measuring the second wind speed.

7 . A method for monitoring a wind turbine having a wind vane that, together with two anemometers, is arranged on a leeward side of a rotor of the wind turbine, comprising:
cyclically executing the method according to claim 1 ; determining a calibration quality on the basis of a time progression of the cyclically output installation angle.

8 . A method for operating a wind turbine having a nacelle, arranged on a tower, a rotor and a wind vane that is arranged, together with two anemometers, on a leeward side of the rotor, which comprises:
ascertaining an installation angle by means of a method according to claim 1 ; adjusting the wind vane on the basis of the output installation angle; and aligning the nacelle on the basis of wind directions measured by means of the adjusted wind vane.

9 . Computer program, which comprises instructions that, when they are executed by a computer, cause the latter to execute the steps of a method according to claim 1 .

10 . Computer-readable medium, on which a computer program according to claim 9 is stored.

11 . A system for calibrating a wind vane of a wind turbine having a wind vane for measuring a wind direction, a first anemometer for measuring a first wind speed, a second anemometer for measuring a second wind speed, and a control facility, the wind vane, the first anemometer and the second anemometer being arranged on the leeward side of a rotor of the wind turbine, and the control facility having:
means or recording a multiplicity of measurement values of the first and second anemometers and of the wind vane over a predefined time period; means for determining differences between the first wind speed and the second wind speed at respectively at least substantially the same instants; means for determining a first model function for a relationship between wind directions, measured by means of the wind vane, and determined differences that correspond, at least substantially, to the same instants, for a first wind-speed bin; means for determining a second model function for a relationship between wind directions, measured by means of the wind vane, and determined differences that correspond, at least substantially, to the same instants, for a second wind-speed bin; means for determining at least one intersection point value of the measured wind direction at which the first model function and the second model function intersect; and an interface, which is configured to output the at least one determined intersection point value as an installation angle of the wind vane.

12 . The system according to claim 11 , the first anemometer and the second anemometer being arranged, together with the wind vane, in a plane perpendicular to the rotor axis of the rotor.

13 . The system according to claim 11 , the first anemometer and the second anemometer being arranged at a distance from each other, and the first anemometer and the second anemometer being arranged with an offset in the horizontal direction, preferably in a plane, further preferably equidistantly in relation to the wind vane.

14 . The system according to claim 11 , the first anemometer being realized so as to be structurally identical to the second anemometer.

Assignees

• Senvion Gmbh

Inventors

• Mittelmeier Niko

Classifications

• G01P21/00

  Testing or calibrating of apparatus or devices covered by the preceding groups · CPC title

• F05B2200/12

  Subtraction · CPC title

• F05B2270/802

  Calibration thereof · CPC title

• F03D7/0204

  for orientation in relation to wind direction · CPC title

• F05B2270/321

  Wind directions · CPC title