Method and system for determining an alignment correction function

Patent metadata

Field	Value
Publication number	US-2019323482-A1
Application number	US-201916279194-A
Country	US
Kind code	A1
Filing date	Feb 19, 2019
Priority date	Feb 19, 2018
Publication date	Oct 24, 2019
Grant date	—

Abstract

The present invention relates to a method for determining a correction function for a wind turbine, to a method and a system for determining an alignment correction function for a nacelle of a wind turbine, and to a method for operating a wind turbine. A power measure of the wind turbine, a leeward wind direction, and a leeward wind speed are measured, a multiplicity of measurement values being recorded over a defined time period in each case. The measurement values of the power measure and of the leeward wind direction are assigned to measurement values of the leeward wind speed, corrected by means of a correction function, that are grouped into at least one wind-speed bin, on the basis of instants at which the measurement values were recorded. A model function is determined and outputted for a relationship between the power measure and the leeward wind direction for the at least one wind-speed bin, and an alignment correction function is determined for a target alignment of the nacelle relative to the measured leeward wind direction, on the basis of the model function.

First claim

What is claimed is:

1 . A method for determining a correction function for a wind turbine , by means of which a windward wind speed can be determined on the basis of leeward wind speed measured by a leeward-side anemometer of the wind turbine, windward and leeward relating to a rotor of the wind turbine, comprising:
measuring a windward wind speed, a leeward wind speed, and a leeward wind direction, a multiplicity of measurement values being recorded in a defined time period in each case; and determining the correction function on the basis of the recorded measurement values by means of a model, the recorded measurement values being related to each other in the model, and the correction function assigning a windward wind speed to a leeward wind speed in dependence on a leeward wind direction; and outputting the determined correction function.

2 . The method according to claim 1 , the model being a multilinear regression model.

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

4 . The method according to claim 1 , the windward wind speed being determined by means of a sensor device, which is configured as a Lidar instrument, Sodar instrument, or reference anemometer.

5 . The method according to claim 4 , the sensor device being arranged on the windward side and separately from the wind turbine, in particular on an adjacent wind turbine.

6 . A method for determining an alignment correction function for a nacelle of a wind turbine that is arranged on a tower, the wind turbine having at least one anemometer arranged on a leeward side of a rotor of the wind turbine, and a wind vane arranged on the leeward side of the rotor, the method comprising:
measuring a power measure of the wind turbine, a leeward wind direction by means of the wind vane and a leeward wind speed by means of the at least one anemometer, a multiplicity of measurement values being recorded over a defined time period in each case; assigning measurement values of the power measure and of the leeward wind direction to measurement values of the leeward wind speed that are grouped into at least one wind-speed bin, on the basis of instants at which the measurement values were recorded, the measurement values of the leeward wind speed being corrected by means of a correction function determined according to a method according to claim 1 ; determining a model function for a relationship between the power measure and the leeward wind direction for the at least one wind-speed bin; determining an alignment correction function for a target alignment of the nacelle relative to the measured leeward wind direction, on the basis of the model function, the alignment correction function fulfilling a predefined criterion in respect of the determined model function for the at least one wind-speed bin; and outputting the determined alignment correction function.

7 . The method according to claim 6 , the criterion being a maximization of the model function.

8 . The method according to claim 6 , the power measure being a rotor rotational speed of the rotor or a generator rotational speed of a generator of the wind turbine.

9 . The method according to claim 6 , the model function being determined for a plurality of wind-speed bins, and the output alignment correction function forming an operating characteristic for the target alignment of the nacelle relative to the measured leeward wind direction.

10 . A method for operating a wind turbine that has a nacelle arranged on a tower, a rotor and an anemometer, the anemometer being arranged leeward of the rotor, the method comprising:
determining a leeward wind speed by means of the anemometer; and aligning the nacelle by use of an alignment correction function, in particular an operating characteristic, determined according to the method according to claim 6 , with the determined leeward wind speed being taken into account.

11 . A 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 .

12 . A computer-readable medium, on which a computer program according to claim 11 is stored.

13 . A system for determining an alignment correction function for a nacelle of a wind turbine that is arranged on a tower and has at least one anemometer, a wind vane and a control facility, the at least one anemometer and the wind vane being arranged on a leeward side of a rotor of the wind turbine, and the control facility having:
means for recording a multiplicity of measurement values of a leeward wind speed determined by means of the anemometer, of a leeward wind direction determined by means of the wind vane, and of a power measure of the wind turbine, over a defined time period; means for assigning measurement values of the power measure and of the leeward wind direction to measurement values of the leeward wind speed that are grouped into at least one wind-speed bin, on the basis of instants at which the measurement values were recorded, the measurement values of the leeward wind speed being corrected by means of a correction function; means for determining a model function for a relationship between the power measure and the leeward wind direction for the at least one wind-speed bin; means for determining an alignment correction function for a target alignment of the nacelle relative to the measured leeward wind direction, on the basis of the model function, the alignment correction function fulfilling a predefined criterion in respect of the determined model function for the at least one wind-speed bin; and interface for outputting the determined alignment correction function.

Assignees

• Senvion Gmbh

Inventors

• Mittelmeier Niko

Classifications

• F05B2270/321

  Wind directions · CPC title

• F05B2270/32

  Wind speeds · CPC title

• F03D17/00 Primary

  Monitoring or testing of wind motors, e.g. diagnostics (testing during commissioning of wind motors F03D13/30) · CPC title

• F03D7/0204 Primary

  for orientation in relation to wind direction · CPC title

• F05B2260/84

  Modelling or simulation · CPC title