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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 synchr

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.

대표청구항 ▼

In a power generating system including a wind turbine driven generator adapted to be selectively connected to a load to supply power thereto, said wind turbine having a wind driven rotor with a plurality of variable pitch angle blades, a control for adjusting the pitch angle of said blades comprisin

In a power generating system including a wind turbine driven generator adapted to be selectively connected to a load to supply power thereto, said wind turbine having a wind driven rotor with a plurality of variable pitch angle blades, a control for adjusting the pitch angle of said blades comprising: speed control means adapted to produce a first signal indicative of rate of change of blade pitch angle when said generator is not supplying power to said load, acceleration control means adapted to produce a second signal indicative of rate of change of blade pitch angle during start up of said wind turbine, deceleration control means adapted to produce a third signal indicative of rate of change of blade pitch angle during shut down of said wind turbine, power control means adapted to produce a fourth signal indicative of rate of change of blade pitch angle when said generator is supplying power to said load, means for selecting one of said blade pitch angle rate signals, integrator means receiving said selected blade pitch angle rate signal and producing therefrom a desired blade pitch angle signal, and actuator means receiving said desired blade pitch angle signal and controlling the pitch angle of said blades in response thereto.