WO1996020343B1 - Rotor device and control for wind turbine - Google Patents

Rotor device and control for wind turbine

Info

Publication number
WO1996020343B1
WO1996020343B1 PCT/US1995/016074 US9516074W WO9620343B1 WO 1996020343 B1 WO1996020343 B1 WO 1996020343B1 US 9516074 W US9516074 W US 9516074W WO 9620343 B1 WO9620343 B1 WO 9620343B1
Authority
WO
WIPO (PCT)
Prior art keywords
blade
cone angle
actuator
blades
operating parameter
Prior art date
Application number
PCT/US1995/016074
Other languages
French (fr)
Other versions
WO1996020343A3 (en
WO1996020343A2 (en
WO1996020343A9 (en
Filing date
Publication date
Priority claimed from US08/360,310 external-priority patent/US5584655A/en
Application filed filed Critical
Priority to AU45973/96A priority Critical patent/AU4597396A/en
Publication of WO1996020343A2 publication Critical patent/WO1996020343A2/en
Publication of WO1996020343A3 publication Critical patent/WO1996020343A3/en
Publication of WO1996020343B1 publication Critical patent/WO1996020343B1/en
Publication of WO1996020343A9 publication Critical patent/WO1996020343A9/en

Links

Abstract

A wind turbine with blades having a high lift-to-drag ratio is provided. A hydraulic or other control system is used to control cone angle, such as in response to flap moment. Pitch of blades is controlled, such as in relation to the blade flap angle. Teeter motion is controlled preferably as a function of teeter angular v elocity.

Claims

• , ,^ AMENDED CLAIMS [received by the International Bureau on 30 July 1 96 (30.07.96); original claims 3, 14 and 15 amended; remaining claims unchanged (2 pages)]
1. In a wind turbine having a plurality of blades each having a longitudinal axis, the blades being rotatable about an axis of rotation, apparatus comprising: at least a first actuator coupled to at least a first of said blades so as to controllably change at least a first positional characteristic of said first blade selected from the group consisting of a blade cone angle, a blade pitch and a teeter angle; 5 a sensor which senses at least a first operating parameter of said wind turbine selected from the group consisting of an indication of blade flap moment, an indication of blade cone angle and an indication of teeter angular velocity; wherein said first actuator controls said first positional characteristic in response to the value of said first operating parameter sensed by said sensor.
2. In a wind turbine having a plurality of blades each having a longitudinal axis, the blades being rotatable about an axis of rotation, so as to be inclined to said axis of rotation, defining a cone angle for each blade, apparatus comprising: at least a first actuator coupled to at least a first of said blades so as to controllably change said cone angle of at least said first blade; 5 a sensor which senses at least a first operating parameter of said wind turbine; wherein said first actuator controls changes of said cone angle of at least said first blade in response to the value of said first operating parameter sensed by said sensor.
3. Apparatus as claimed in claim 2 wherein said first actuator permits only incremental changes in cone angle.
4. Apparatus as claimed in claim 2 wherein said first actuator permits changes in cone angle only when said first operating parameter has changed by a first amount.
5. Apparatus as claimed in claim 2 wherein said first operating parameter is averaged over a first time period.
6. Apparatus, as claimed in claim 2, wherein said first operating parameter provides an indication of blade flap moment.
7. Apparatus, as claimed in claim 2, wherein said first operating parameter is selected from the group consisting of wind speed, blade flexure, blade strain, and power output change.
8. Apparatus, as claimed m claim 2, wherein said first actuator comprises a hydraulic cylinder coupling a root portion of said first blade to a point which is fixed relative to said axis of rotation.
9. Apparatus, as claimed in claim 8, wherein said sensor senses hydraulic pressure in said hydraulic cylinder.
10. Apparatus, as claimed in claim 2, wherein said first actuator comprises an actuator selected from the group consisting of a lead screw, a linear motor and a hydraulic cylinder.
11. Apparatus, as claimed in claim 2, further comprising a transducer which indicates the current cone angle of at least said first blade.
12. Apparatus, as claimed in claim 2, further comprising a microprocessor for receiving output from said first sensor and sending a command signal to said actuator to control said cone angle.
13. Apparatus, as claimed in claim 2, wherein said first actuator controllably changes said cone angle in response to a change in a value of said first parameter which is averaged over at least a first time period.
14. Apparatus, as claimed in claim 2, wherein each of said plurality of blades is independently controlled to change the cone angle for said blades in response to the value of said first operating parameter of said wind turbine.
15. Apparatus, as claimed in claim 2, further comprising at least a second actuator coupled to at least a second of said blades so as to controllably change said cone angle of said second blade; wherein both said first actuator and said second actuator control changes in said cone angle of said first blade and said second actuator controls changes in said cone angle of said second blade in response to the value of said first operating parameter sensed by said sensor, so as to provide a cone angle of said second blade which is substantially equal to a cone angle of said first blade.
16. In a wind turbine having a plurality of blades each having a longitudinal axis, the blades being rotatable about an axis of rotation, so as to be inclined to said axis of rotation, defining a cone angle, apparatus comprising: first means for sensing at least a first operating parameter of said wind turbine; means for changing said cone angle in response to the value of said first operating parameter sensed by said first means.
PCT/US1995/016074 1994-12-21 1995-12-12 Rotor device and control for wind turbine WO1996020343A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU45973/96A AU4597396A (en) 1994-12-21 1995-12-12 Rotor device and control for wind turbine

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/360,310 US5584655A (en) 1994-12-21 1994-12-21 Rotor device and control for wind turbine
US08/360,310 1994-12-21

Publications (4)

Publication Number Publication Date
WO1996020343A2 WO1996020343A2 (en) 1996-07-04
WO1996020343A3 WO1996020343A3 (en) 1996-09-12
WO1996020343B1 true WO1996020343B1 (en) 1996-12-05
WO1996020343A9 WO1996020343A9 (en) 1997-01-30

Family

ID=23417466

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1995/016074 WO1996020343A2 (en) 1994-12-21 1995-12-12 Rotor device and control for wind turbine

Country Status (3)

Country Link
US (1) US5584655A (en)
AU (1) AU4597396A (en)
WO (1) WO1996020343A2 (en)

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