| 摘要 |
The invention relates to a power generating system which includes a wind turbine driven source of energy. The wind turbine has a wind driven rotor with a plurality of variable pitch blades, and a control for minimizing mechanical stresses in the system during rapid angular momentum changes of the rotor such as during start-up and shut-down. In accordance with the invention, the generating system includes a sensor for sensing the rotational speed of the system and for producing a first signal indicative of the rotational speed. A second sensor senses the velocity of the wind driving the rotor and produces a second signal indicative of the velocity. A scheduler receives the first and second signals and produces, as a function of these signals, a desired blade pitch angle signal. A controller for the blade pitch angle receives the desired blade pitch angle signal and, in response to this signal, regulates the pitch angle of the rotor blades. The controller includes an angle measurer for measuring the actual pitch angle of the rotor blades and producing a third signal indicative of the pitch angle. A comparator compares the desired blade pitch angle signal with the actual blade pitch angle signal and produces a blade pitch angle error signal. An actuator, which is responsive to the error signal, regulates the blade pitch angle. |
