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Patent
F - Mech Eng,Light,Heat,Weapons
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Patent
CA 1120538
U. S. Ser. No. 934,65 MULTI MODE CONTROL SYSTEM FOR WIND TURBINES ABSTRACT OF THE DISCLOSURE A multi-mode electronic wind turbine control system establishes a reference blade angle for a two-bladed, horizontal axis, variable pitch wind turbine rotor, the blade angle being regulated by a hydraulic pitch change mechanism. The rotor, via appropriate shafts and a gear- box, is coupled to a synchronous generator to produce electrical energy which is fed to a power utility grid. The control system provides closed loop pitch control for rotor acceleration rate during start-up, for rotor de- celeration rate during shutdown, for speed control when the synchronous generator is off-line, and for power con- trol when the synchronous generator is on-line. A single control integrator is used for all closed loop operating modes, with a rate limiter circuit in front of the control integrator to prevent integrator overtravel. The inte- grator has maximum and minimum blade angle stops, the minimum stop being variable as a function of rotor speed and wind speed. When on-line, power control is provided by a unique shaft torque control using proportional plus integral plus derivative controls in combination. H893-CC
330730
Harner Kermit I.
Kos Joseph M.
Patrick John P.
Swabey Ogilvy Renault
United Technologies Corporation
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