초록 ▼

In order to control the turbine speed of a windmill employed for power generation, the pitch of the turbine blades is based on a dual-deadband control strategy. If the current turbine speed is determined to be outside of a relatively wide deadband, action is taken to correct the speed by changing bl

In order to control the turbine speed of a windmill employed for power generation, the pitch of the turbine blades is based on a dual-deadband control strategy. If the current turbine speed is determined to be outside of a relatively wide deadband, action is taken to correct the speed by changing blade pitch accordingly. If the current speed is not outside of the relatively wide deadband, then the average of the turbine speed over a recent interval is compared with a relatively narrow deadband within the wider deadband. Action is then taken to change the blade pitch if the average speed is outside the narrow deadband. In this way, wide excursions of turbine speed are corrected promptly, but the frequency of control actions is minimized by requiring only the average speed to be kept within tight limits.

대표청구항 ▼

A windmill control system for controlling a windmill that includes a turbine having turbine blades and a blade-pitch actuator for varying the pitch of the turbine blades in response to pitch-command signals applied thereto, said control system comprising: A. a control output sensor for sensing a win

A windmill control system for controlling a windmill that includes a turbine having turbine blades and a blade-pitch actuator for varying the pitch of the turbine blades in response to pitch-command signals applied thereto, said control system comprising: A. a control output sensor for sensing a windmill control output and generating an output signal representative of the sensed control output; and B. a control circuit for generating pitch-command signals, said control circuit being electrically connected to said blade-pitch actuator for transmission of the command signals to it, said control circuit further being electrically connected to said control-output sensor for reception of output signals therefrom and for deriving from the output signals a current control output and an average of the control output over a predetermined averaging interval, said control circuit sending command signals to said blade-pitch actuator to command pitch-angle changes in response to current and average control output, throughout at least a range of control outputs, only if the current control output is outside a predetermined wide deadband or the average control output is outside a predetermined narrow deadband included within the wide deadband, said control system thereby responding promptly to control-output excursions outside the wide deadband but acting to bring the control output within the narrow deadband only when the average control output falls outside the narrow deadband.