Multi-mode control system for wind turbines

Details Multi-mode control system for wind turbines Multi-mode control system for wind turbines

1978-08-17

1980-03-11

Rubinson, Gene Z.

Prime-mover dynamo plants

Electric control

Fluid-current motors

290 55, F03D 900

Patent

active

041930053

ABSTRACT:
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.

REFERENCES:
patent: 2666149 (1954-01-01), Fumagalli
patent: 2795285 (1957-06-01), Champney
patent: 3639076 (1972-02-01), Rowen
patent: 3932058 (1976-01-01), Harner et al.
patent: 4006925 (1977-02-01), Scherer
patent: 4160170 (1979-07-01), Harner et al.

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