Control system for a wind power plant

• US 6,850,821 B2
• Filed: 01/28/2003
• Issued: 02/01/2005
• Est. Priority Date: 03/09/2000
• Status: Expired due to Term

• Current Assignee: General Electric Company
• Original Assignee: General Electric Company
• Inventors: Weitkamp, Roland
• Primary Examiner(s): Bahta, Kidest
• Application Number:
  US10/354,054
• Publication Number:
  US 20030127862A1
• Time in Patent Office: 735 Days
• Field of Search: 700/174, 700/108, 700/21, 700/286, 700/291, 700/245, 700/297, 416/19, 416/139, 114/102, 322/32, 322/22, 322/25, 290/55, 290/44
• US Class Current: 700/286
• CPC Class Codes: F03D 7/0276 controlling rotor speed, e.g. variable speed
• CPC Class Codes: F03D 7/0292 to reduce fatigue
• CPC Class Codes: F03D 7/042 by means of an electrical or electronic controller
• CPC Class Codes: F03D 7/043 characterised by the type of control logic
• CPC Class Codes: F03D 7/048 controlling wind farms
• CPC Class Codes: F05B 2260/821 Parameter estimation or prediction
• CPC Class Codes: F05B 2270/1016 in variable speed operation
• CPC Class Codes: F05B 2270/20 to optimise the performance of a machine
• CPC Class Codes: F05B 2270/32 Wind speeds
• CPC Class Codes: F05B 2270/322 the detection or prediction of a wind gust
• CPC Class Codes: F05B 2270/331 Mechanical loads
• CPC Class Codes: F05B 2270/332 Maximum loads or fatigue criteria
• CPC Class Codes: F05B 2270/504 electronic means, e.g. electronic tubes, transistors or IC's within an electronic circuit
• CPC Class Codes: Y02E 10/72 Wind turbines with rotation axis in wind direction

Abstract

A control system for a wind power plant that includes a damage module and a control module. The damage module compares existing stress conditions on one or more component parts of the wind power plant to current energy generating costs. The control module alters electric power generated by the wind power plant based upon the comparison.

Claims

1. A control system for a wind power plant, comprising:

a damage module operable to compare existing stress conditions on one or more component parts of the wind power plant to current energy generating costs; and

a control module operable to alter electric power generated by the wind power plant based upon the comparison.

2. The control system of claim 1, further comprising:

a cost of energy module operable to provide the current energy generating costs based upon financing data for the wind power plant and current charges for power delivery.

3. The control system of claim 1, further comprising:

a stress module operable to determine existing stress conditions on one or more component parts of the wind power plant and to provide data on existing stress conditions on the one or more component parts of the wind power plant to the damage module.

4. The control system of claim 3, wherein the stress module compares existing stress on a first component to designed allowable stresses to provide the stress data to the damage module.

5. The control system of claim 3, wherein the stress module determines existing stress conditions on a first component based upon local meteorological conditions.

6. The control system of claim 1, wherein the control module changes blade pitch of one or more turbine blades of the wind power plant to alter the electrical power generated by the wind power plant.

7. The control system of claim 6, wherein change to the blade pitch occurs in a direction of a feathered pitch.

8. The control system of claim 1, wherein the control module alters rotor speed of the wind power plant to alter the electrical power generated by the wind power plant.

9. The control system of claim 1, further comprising:

a second control module to anticipatorily reduce loading of the wind power plant based upon receiving data of neighboring wind power plants located upstream relative to a wind direction.

10. The control system of claim 1, wherein the damage module determines the damage to the one or more components based upon actual spectra.

11. A method, comprising:

comparing existing stress conditions on one or more component parts of a wind power plant based upon local meteorological conditions to energy generating costs at that time; and

controlling blade pitch of one or more turbine blades of the wind power plant based upon the comparison.

12. The method of claim 11, further comprising:

detecting a direction of a wind; and

anticipatorily reducing loading of the wind power plant based upon receiving data from one or more neighboring wind power plants located upstream relative to the direction of the wind.

13. The method of claim 11, further comprising:

determining the energy generating costs at that time based upon financing data for the wind power plant and current charges for power delivery.

14. The method of claim 11, further comprising:

determining the existing stress on a first component by measuring strain on representative points along the first component, factoring in how long the first component has been in service, and factoring in a magnitude of strain that the first component has been exposed to.

15. The method of claim 11, further comprising:

determining the existing stress on a first component by measuring deformation in elastic bearings.

16. An apparatus, comprising:

means for comparing existing stress conditions on one or more component parts of a wind power plant based upon local meteorological conditions to energy generating costs at that time; and

means for controlling blade pitch of one or more turbine blades of the wind power plant based upon the comparison.

17. The apparatus of claim 16, further comprising:

means for controlling rotor speed of the wind power plant to alter electrical power generated by the wind power plant.

18. The apparatus of claim 16, further comprising:

means for detecting a direction of a wind; and

means for anticipatorily reducing loading of the wind power plant based upon receiving data from one or more neighboring wind power plants located upstream relative to the direction of the wind.

19. The method of claim 16, further comprising:

means for determining the energy generating costs at that time based upon financing data for the wind power plant and current charges for power delivery.

20. The method of claim 16, further comprising:

means for determining the existing stress on a first component by measuring strain on representative points along the first component, factoring in how long the first component has been in service, and factoring in a magnitude of strain that the first component has been exposed to.

21. A control system for a wind power plant, comprising:

a stress module operable to statistically determine existing stress conditions on one or more component parts of the wind power plant and then compare the statistically determined existing stress conditions to predicted stress distributions; and

a control module operable to alter electric power generated by the wind power plant based upon the comparison.

22. The control system of claim 21, wherein the control module alters rotor speed of the wind power plant but maintains the same level of electrical power generated by the wind power plant.

23. The control system of claim 21, wherein the control module alters rotor speed of the wind power plant based upon the comparison independent of the electrical power generated by the wind power plant.