Active control system for high speed windmills
Abstract
A pump stroke is matched to the operating speed of a high speed windmill. The windmill drives a hydraulic pump for a control. Changes in speed of a wind driven shaft open supply and exhaust valves to opposite ends of a hydraulic actuator to lengthen and shorten an oscillating arm thereby lengthening and shortening the stroke of an output pump. Diminishing wind to a stall speed causes the valves to operate the hydraulic cylinder to shorten the oscillating arm to zero. A pressure accumulator in the hydraulic system provides the force necessary to supply the hydraulic fluid under pressure to drive the actuator into and out of the zero position in response to the windmill shaft speed approaching and exceeding windmill stall speed. 4 figs.
- Inventors:
- Issue Date:
- OSTI Identifier:
- 7023431
- Patent Number(s):
- 4718825 A
- Application Number:
- PPN: US 6-875931
- Assignee:
- PTO; EDB-94-114898
- DOE Contract Number:
- FG03-81SF11622
- Resource Type:
- Patent
- Resource Relation:
- Patent File Date: 19 Jun 1986
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 17 WIND ENERGY; CONTROL EQUIPMENT; DESIGN; WIND-POWERED PUMPS; ACTUATORS; HYDRAULIC ACCUMULATORS; SPEED REGULATORS; ACCUMULATORS; CONTAINERS; EQUIPMENT; MECHANICAL ENERGY STORAGE EQUIPMENT; PUMPS; TANKS; 170602* - Wind Energy Engineering- Turbine Design & Operation
Citation Formats
Avery, D.E. Active control system for high speed windmills. United States: N. p., 1988.
Web.
Avery, D.E. Active control system for high speed windmills. United States.
Avery, D.E. Tue .
"Active control system for high speed windmills". United States.
@article{osti_7023431,
title = {Active control system for high speed windmills},
author = {Avery, D.E.},
abstractNote = {A pump stroke is matched to the operating speed of a high speed windmill. The windmill drives a hydraulic pump for a control. Changes in speed of a wind driven shaft open supply and exhaust valves to opposite ends of a hydraulic actuator to lengthen and shorten an oscillating arm thereby lengthening and shortening the stroke of an output pump. Diminishing wind to a stall speed causes the valves to operate the hydraulic cylinder to shorten the oscillating arm to zero. A pressure accumulator in the hydraulic system provides the force necessary to supply the hydraulic fluid under pressure to drive the actuator into and out of the zero position in response to the windmill shaft speed approaching and exceeding windmill stall speed. 4 figs.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1988},
month = {1}
}