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Title: 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}
}