US4703189A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Torque control for a variable speed wind turbine
Assignee: RTX Corp
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Filing: 1985-11-18
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Granted: 1987-10-27
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Expires: 2005-11-18
Abstract
Abstract Apparatus and method for controlling a variable speed wind turbine-generator at improved efficiencies is disclosed. The method and apparatus of the invention control the rotor tip speed below the limiting torque of the wind turbine at a selected constant velocity ratio with respect to wind speed and, above the limiting torque, control the rotor tip speed at speeds greater than those dictated by the constant velocity ratio up to a speed or power limit. This may be accomplished by controlling tip speed above the point where limiting torque is attainable to maintain optimal wind turbine performance along the performance envelope.
Inventors
- 👤 Eugene D. DiValentin
- 👤 Henry S. Healy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:32
CPC Classifications
F; F03; F03D; F03D7/00; F03D7/02; F03D7/022; F03D7/0224; F03D7/0272; H; H02; H02P; H02P9/00; H02P9/42; F05; F05B; F05B2220/00; F05B2220/70; F05B2220/706; F05B2270/00; F05B2270/10; F05B2270/1016; F05B2270/103; F05B2270/1032; F05B2270/20; F05B2270/30; F05B2270/327; H02P2101/00; H02P2101/15; Y; Y02; Y02E; Y02E10/00; Y02E10/70; Y02E10/72
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
114 words
A method for controlling the torque of a variable speed wind turbine-generator, comprising the steps of: controlling, in response to sensed speed and power signals, the generator torque while operating below a torque limit of the wind turbine by providing a generator control signal for maneuvering the rotor tip speed at a selected constant velocity ratio with respect to wind speed; and controlling, in response to sensed speed and power signals, the generator torque while operating above the torque limit of the wind turbine by providing a generator control signal for maneuvering the rotor tip speed at speeds greater than those dictated by the constant velocity ratio up to a speed or power limit.
Claim 2
Independent Claim
114 words
A method for controlling the torque of a variable speed wind turbine-generator, comprising the steps of: controlling, in response to sensed speed and power signals, the generator torque while operating below a torque limit of the wind turbine by providing a generator control signal for maneuvering the rotor tip speed at a selected constant velocity ratio with respect to wind speed; and controlling, in response to sensed speed and power signals, the generator torque while operating above the torque limit of the wind turbine by providing a generator control signal for maneuvering the rotor tip speed at speeds greater than those dictated by the constant velocity ratio up to a speed or power limit.
Claim 3
Dependent Claim
43 words
The method of claim 1, wherein the step of controlling generator torque above the torque limit up to the speed or power limit increases power output at the maximum value possible while maintaining a constant torque value by following the turbine performance map.
Claim 4
Dependent Claim
131 words
Apparatus for controlling a variable speed wind turbine-generator at improved efficiencies, comprising: a speed sensor, responsive to either the wind turbine rotor or generator rotor speed for providing a sensed turbine-generator speed signal; a power sensor, responsive to the power output of the generator for providing a sensed power signal; and a controller, responsive to the sensed speed signal and to the sensed power signal for providing a wind turbine-generator torque control signal for controlling the generator torque for maneuvering the turbine rotor tip speed below the torque limit of the wind turbine at a selected constant velocity ratio with respect to wind speed and at speeds greater than those dictated by the constant velocity ratio above the torque limit up to a speed or power limit while holding torque constant.
Claim 5
Dependent Claim
131 words
Apparatus for controlling a variable speed wind turbine-generator at improved efficiencies, comprising: a speed sensor, responsive to either the wind turbine rotor or generator rotor speed for providing a sensed turbine-generator speed signal; a power sensor, responsive to the power output of the generator for providing a sensed power signal; and a controller, responsive to the sensed speed signal and to the sensed power signal for providing a wind turbine-generator torque control signal for controlling the generator torque for maneuvering the turbine rotor tip speed below the torque limit of the wind turbine at a selected constant velocity ratio with respect to wind speed and at speeds greater than those dictated by the constant velocity ratio above the torque limit up to a speed or power limit while holding torque constant.
Claim 6
Dependent Claim
31 words
The apparatus of claim 3, wherein the controller increases power output above the torque limit as a function of the product of the cube of wind speed and the power ratio.
Claim 7
Dependent Claim
80 words
The apparatus of claim 3, further comprising an aerodynamic torque control, responsive to an aerodynamic torque command signal for changing the aerodynamic torque of the turbine rotor and wherein the controller includes means responsive to the sensed speed signal for providing an aerodynamic torque command signal for commanding changes in aerodynamic control for increases in power output above the torque limit in a manner that aerodynamically holds rotor thrust constant despite increasing wind speed while maintaining a constant torque value.
Claim 8
Dependent Claim
76 words
The method of claim 1, further comprising the steps of: responding to said sensed speed signal and providing, in response thereto, an aerodynamic force command signal for commanding changes in aerodynamic control for increasing power output above the torque limit in a manner that aerodynamically holds rotor thrust constant with increasing wind speed while maintaining a constant torque value; and responding to said aerodynamic force command signal for changing the aerodynamic torque of the turbine rotor.
References Cited (Backward Citations)
US4161658A
Cited
US4189648A
Cited
US4160170A
Cited
US4503673A
Cited
JPS56107796A
Cited
JPS56150999A
Cited
US4400659A
Cited
US4330743A
Cited
US4331881A
Cited
US4339666A
Cited
US4420692A
Cited
US4435647A
Cited
US4511807A
Cited
US4525633A
Cited
US4565929A
Cited
US4481459A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-10-26 | 1991-04-27 | 1991-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-10-26 | 1995-04-27 | 1995-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-10-26 | 1999-04-27 | 1999-10-27 | $7700.00 | Window Closed / Lapsed |