초록 ▼

A control system for adjusting the pitch of variable-pitch angle blades in a wind turbine for generating electric power maintains the control signal for the variable-pitch angle blades above a minimum level representing the minimum desired angle of the variable-pitch blades. The control system inclu

A control system for adjusting the pitch of variable-pitch angle blades in a wind turbine for generating electric power maintains the control signal for the variable-pitch angle blades above a minimum level representing the minimum desired angle of the variable-pitch blades. The control system includes a subtractor for generating a difference signal; a device for generating from the difference signal a first blade control signal greater than a minimum level, from a device for generating a second blade control signal greater than a minimum level, from first blade control signal and the difference signal; a device for generating a third blade control signal for adjusting the pitch of variable-pitch angle blades, from second blade control signal and power rate signal. All devices include limiters which limit their respective output signals to a minimum level representing a preset minimum blade angle.

대표청구항 ▼

A control system for adjusting the pitch of variable-pitch angle blades in a wind turbine generating electric power and for maintaining dynamic stability under all conditions, wherein at low wind speeds said control system maintains the pitch of said blades at an angle close to the value providing m

A control system for adjusting the pitch of variable-pitch angle blades in a wind turbine generating electric power and for maintaining dynamic stability under all conditions, wherein at low wind speeds said control system maintains the pitch of said blades at an angle close to the value providing maximum torque, and at high wind speeds said control system adjusts the pitch of said blades to maintain rated power, said control system comprising: a. means for adding a signal proportional to the rate of change of electric power generated by said wind turbine and a nominal blade control signal; and b. means, coupled to said adding means, for generating a control signal from the output of said adding means to control the pitch of said variable-pitch blades, said generating means including means for ensuring that the values of said control signal remain above a minimum level needed to ensure the blade pitch at said angle close to the value for providing maximum torque.