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    31.
    发明专利
    未知

    公开(公告)号：FI77092B

    公开(公告)日：1988-09-30

    申请号：FI834074

    申请日：1983-11-07

    Applicant: UNITED TECHNOLOGIES CORP

    Inventor： HARNER KERMIT IVAN ,  NIESSEN FRANK RICHARD ,  SHERMAN ROBERT

    IPC: F03D7/04 ,  F03D7/02

    Abstract: A blade pitch angle control system for a wind turbine includes an improved control means (95) for providing a minimum pitch angle reference signal indicative of desired blade pitch at wind velocities less than rated. The control means includes means (35 and 30) for providing signals indicative of generated (output power or torque and the rotational frequency of the wind turbine rotor. The output and rotor speed signals are input to a function generator which, in rsponse to such signals, provides a signal indicative of the minimum pitch angle.

    34.
    发明专利
    未知

    公开(公告)号：IT1137431B

    公开(公告)日：1986-09-10

    申请号：IT2037681

    申请日：1981-03-17

    Applicant: UNITED TECHNOLOGIES CORP

    Inventor： SHERMAN ROBERT ,  BARNES PHILIP EARL ,  MILLARD GIRARD MAYO

    IPC: F03D7/04 ,  F03D7/02 ,  F03D

    Abstract: A pitch control system for a multibladed variable pitch wind turbine. Each of the turbine blades is pivotally driven about the longitudinal axis thereof independently of the other blades by at least a pair of hydraulic actuators. The actuators are supplied with pressurized hydraulic fluid from a first source thereof under conditions of normal pitch change adjustment. Under conditions wherein feathering of the blades is required, the actuators are supplied with hydraulic fluid from second sources thereof such that one of the actuators associated with each of the blades is supplied with fluid from one second source and a second actuator is provided with fluid from a redundant second source whereby blade feathering may be effected despite a malfunction of one of the redundant sources or one of the actuators. In one of the two preferred embodiments disclosed, the first and second fluid sources are maintained in mutual communication whereby fluid from the second sources thereof may supplement fluid from the first source under conditions of normal blade pitch adjustment.

    38.
    发明专利
    未知

    公开(公告)号：BR8306078A

    公开(公告)日：1984-06-12

    申请号：BR8306078

    申请日：1983-11-04

    Applicant: UNITED TECHNOLOGIES CORP

    Inventor： HARNER KERMIT IVAN ,  NIESSEN FRANK RICHARD ,  SHERMAN ROBERT

    IPC: F03D7/04 ,  F03D7/02

    Abstract: A blade pitch angle control system for a wind turbine includes an improved control means (95) for providing a minimum pitch angle reference signal indicative of desired blade pitch at wind velocities less than rated. The control means includes means (35 and 30) for providing signals indicative of generated (output power or torque and the rotational frequency of the wind turbine rotor. The output and rotor speed signals are input to a function generator which, in rsponse to such signals, provides a signal indicative of the minimum pitch angle.

    39.
    发明专利
    未知

    公开(公告)号：NO833993L

    公开(公告)日：1984-05-09

    申请号：NO833993

    申请日：1983-11-02

    Applicant: UNITED TECHNOLOGIES CORP

    Inventor： HARNES KERMIT IVAN ,  NIESSEN FRANK RICHARD ,  SHERMAN ROBERT

    IPC: F03D7/04 ,  F03D7/02 ,  F03D

    Abstract: A blade pitch angle control system for a wind turbine includes an improved control means (95) for providing a minimum pitch angle reference signal indicative of desired blade pitch at wind velocities less than rated. The control means includes means (35 and 30) for providing signals indicative of generated (output power or torque and the rotational frequency of the wind turbine rotor. The output and rotor speed signals are input to a function generator which, in rsponse to such signals, provides a signal indicative of the minimum pitch angle.

    40.
    发明专利
    未知

    公开(公告)号：DK508483D0

    公开(公告)日：1983-11-07

    申请号：DK508483

    申请日：1983-11-07

    Applicant: UNITED TECHNOLOGIES CORP

    Inventor： HARNER KERMIT IVAN ,  NIESSEN FRANK RICHARD ,  SHERMAN ROBERT

    IPC: F03D7/04 ,  F03D7/02 ,  F03D

    Abstract: A blade pitch angle control system for a wind turbine includes an improved control means (95) for providing a minimum pitch angle reference signal indicative of desired blade pitch at wind velocities less than rated. The control means includes means (35 and 30) for providing signals indicative of generated (output power or torque and the rotational frequency of the wind turbine rotor. The output and rotor speed signals are input to a function generator which, in rsponse to such signals, provides a signal indicative of the minimum pitch angle.

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