F - Mech Eng,Light,Heat,Weapons – 03 – D
Patent
F - Mech Eng,Light,Heat,Weapons
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F03D 7/00 (2006.01) F03D 7/02 (2006.01) F03D 7/04 (2006.01) F03D 9/00 (2006.01)
Patent
CA 1120537
U. S, Serial No. 916,32L WIND TURBINE GENERATOR PITCH CONTROL SYSTEM ABSTRACT OF THE DISCLOSURE Wind energy is used to drive a wind turbine, which is in turn connected to an electrical generator to produce electri- cal power. The pitch angle of the wind turbine blades is controlled in a closed loop manner to maintain either a con- stant generator speed for isolated power generating stations or when the generator is synchronized to the load, or con- stant generator output power or shaft torque when the gen- erator is connected to an electrical grid. Open loop ac- celeration and deceleration schedules are provided to mini- mize blade stress and shaft torque variations during start up and shutdown transients, limiting blade angle excursions as a function of wind velocity and speed. The schedule may be implemented either electronically or by a suitably programmed digital computer. The gains in the speed, torque and power loop controls are scheduled as a function of average wind velocity to optimize stability and response. An anticipatory blade angle schedule responsive to instantaneous wind velocity is added to the desired blade angle reference from the closed loop controls to minimize transient excursions in output power or generator speed resulting from wind gusts. H821-PP
328839
Harner Kermit I.
Kos Joseph M.
Patrick John P.
Swabey Ogilvy Renault
United Technologies Corporation
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