초록 ▼

Wind energy is used to drive a wind turbine, which is in turn connected to an electrical generator to produce electrical power. The pitch angle of the wind turbine blades is controlled in a closed loop manner to maintain either a constant generator speed for isolated power generating stations or whe

Wind energy is used to drive a wind turbine, which is in turn connected to an electrical generator to produce electrical power. The pitch angle of the wind turbine blades is controlled in a closed loop manner to maintain either a constant generator speed for isolated power generating stations or when the generator is synchronized to the load, or constant generator output power or shaft torque when the generator is connected to an electrical grid. Open loop acceleration and deceleration schedules are provided to minimize blade stress and shaft torque variations during start up and shutdown transients, limiting blade angle excursions as a function of wind velocity and speed. The schedules may be implemented either electronically or by a suitably programmed digital computer. The gains in the speed, torque and power loop controls are scheduled as a function of average wind velocity to optimize stability and response. An anticipatory blade angle schedule responsive to instantaneous wind velocity is added to the desired blade angle reference from the closed loop controls to minimize transient excursions in output power or generator speed resulting from wind gusts.

대표청구항 ▼

In a power generating system including a wind turbine driven generator, said wind turbine having a wind driven rotor with a plurality of variable pitch angle blades: means for sensing a variable of operation of said system and producing a first signal indicative thereof, means for sensing the veloci

In a power generating system including a wind turbine driven generator, said wind turbine having a wind driven rotor with a plurality of variable pitch angle blades: means for sensing a variable of operation of said system and producing a first signal indicative thereof, means for sensing the velocity of the wind driving said rotor and producing a second signal indicative thereof, scheduling means responsive to said first and second signals for producing as a function thereof a blade pitch angle reference signal, means for measuring the actual pitch angle of said rotor blades and producing a third signal indicative thereof, comparator means comparing said blade pitch angle reference signal with said third signal and producing a blade angle error signal, and blade pitch actuator means responsive to said blade pitch angle error signal for regulating the pitch angle of said rotor blades.