公开(公告)号：AU540223B2

公开(公告)日：1984-11-08

申请号：AU6841281

申请日：1981-03-16

Applicant: UNITED TECHNOLOGIES CORP

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

IPC: F03D7/04 ,  F03D7/02 ,  B64C11/38

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.

公开(公告)号：FI66240B

公开(公告)日：1984-05-31

申请号：FI792920

申请日：1979-09-19

Applicant: UNITED TECHNOLOGIES CORP

Inventor： SHERMAN ROBERT ,  ROTHMAN EDWARD ALLEN ,  MANDELBAUM WILLIAM

IPC: F03D1/06 ,  F03D11/00

公开(公告)号：FI834074A0

公开(公告)日：1983-11-07

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 ,  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.

公开(公告)号：AU524715B2

公开(公告)日：1982-09-30

申请号：AU5055479

申请日：1979-09-04

Applicant: UNITED TECHNOLOGIES CORP

Inventor： SHERMAN ROBERT ,  MANDELBAUM WILLIAM ,  ROTHMAN EDWARD ALLEN

IPC: F03D1/06 ,  F03D11/00 ,  B64C11/10 ,  F01D5/30

公开(公告)号：DE3110263A1

公开(公告)日：1982-03-25

申请号：DE3110263

申请日：1981-03-17

Applicant: UNITED TECHNOLOGIES CORP

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

IPC: F03D7/04 ,  F03D7/02 ,  F03D1/06 ,  B64C11/38

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.

公开(公告)号：FI810813L

公开(公告)日：1981-09-18

申请号：FI810813

申请日：1981-03-16

Applicant: UNITED TECHNOLOGIES CORP

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

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.

公开(公告)号：FR2304800A1

公开(公告)日：1976-10-15

申请号：FR7606921

申请日：1976-03-11

Applicant: UNITED TECHNOLOGIES CORP

Inventor： SHERMAN ROBERT

IPC: F15B9/08 ,  F02C9/26 ,  F02C9/54 ,  F15B13/16 ,  F15B9/12 ,  F02C7/00 ,  F04D29/56

公开(公告)号：NO157793C

公开(公告)日：1988-05-25

申请号：NO810843

申请日：1981-03-12

Applicant: UNITED TECHNOLOGIES CORP

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

IPC: F03D7/04 ,  F03D7/02

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.

公开(公告)号：NO157793B

公开(公告)日：1988-02-08

申请号：NO810843

申请日：1981-03-12

Applicant: UNITED TECHNOLOGIES CORP

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

IPC: F03D7/04 ,  F03D7/02

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.

公开(公告)号：DE3371673D1

公开(公告)日：1987-06-25

申请号：DE3371673

申请日：1983-11-04

Applicant: UNITED TECHNOLOGIES CORP

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

IPC: F03D7/04 ,  F03D7/02 ,  F03D9/00

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.