Multi-mode control system for wind turbines

F - Mech Eng,Light,Heat,Weapons – 03 – D

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F03D 9/00 (2006.01) F03D 7/00 (2006.01) F03D 7/02 (2006.01) F03D 7/04 (2006.01) H02P 9/04 (2006.01)

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

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