Wind power generating system

F - Mech Eng,Light,Heat,Weapons – 03 – D

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170/30, 138/41,

F03D 1/00 (2006.01) F03D 7/04 (2006.01) F03D 9/00 (2006.01) F03D 11/02 (2006.01) F03D 11/04 (2006.01)

Patent

CA 1125177

WIND POWER GENERATING SYSTEM Abstract of the Disclosure Normally feathered propellers of a wind power generat- ing system unfeather in response to the actuation of a power cylinder that responds to actuating signals. Once operational the propellers generate power over a large range of wind velocities. A maximum power generation de- sign point signals a feather response of the propellers so that once the design point is reached no increase in power results, but the system still generates power. At wind speeds below this maximum point, propeller speed and power output optimize to preset values. The propellers drive a positive displacement pump that in turn drives a positive displacement motor of the swash plate type. The displacement of the motor varies depending on the load on the system, with increasing displacement resulting in increasing propeller speeds, and the converse. In the event of dangerous but not clandestine problems developing in the system, a control circuit dumps hydraulic pressure from the unfeathering cylinder resulting in a predetermined, lower operating pressure produced by the pump. In the event that a problem of potentially clandestine consequence arises, the propeller unfeathering cylinder immediately unloads. Upon start up, a bypass around the motor is blocked applying a pressure across the motor. The motor drives the generator until the generator reaches a predetermined speed whereupon the generator is placed in circuit with a utility grid and permitted to motor up to synchronous speed. 53-2 -1-

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