04193005 is referenced by 85 patents and cites 6 patents.

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 gearbox, 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 deceleration rate during shutdown, for speed control when the synchronous generator is off-line, and for power control 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 integrator 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.

Title
Multi-mode control system for wind turbines
Application Number
5/934658
Publication Number
4193005
Application Date
August 17, 1978
Publication Date
March 11, 1980
Inventor
Kermit I Harner
Windsor
CT, US
John P Patrick
South Windsor
CT, US
Joseph M Kos
Holyoke
MA, US
Agent
Donald F Bradley
Assignee
United Technologies Corporation
CT, US
IPC
F03D 9/00
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