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Title: Wind turbine speed control by automatic yawing

Abstract

A yaw dynamics analysis was developed for a two-bladed horizontal axis wind turbine with passive cyclic pitch variation achieved by letting the blade pair freely oscillate about a common axis with which the blades formed a small prelag angle. This type of rotor was found capable of high yaw rates without imposing vibratory hub moments and without producing noticeable flapping amplitudes. Experiments were conducted with a tail vane stabilized 7.6-m-diam wind rotor driving a three-phase alternator tuned and loaded to produce a rotor torque proportional to the square of the rotor speed. Two yaw control systems which replaced the usual blade feathering controls were investigated: an active yaw control system using a hydraulic rotor speed governor, and a passive system responding to a combination of rotor thrust and torque. During strong gusts both systems limited rotor speed quite accurately. The passive system appeared to be more promising because of its greater reliability and because of the greater ease of adapting it to larger size wind turbines.

Authors:
;
Publication Date:
Research Org.:
Washington University, St. Louis, Missouri
OSTI Identifier:
6761629
Alternate Identifier(s):
OSTI ID: 6761629
Resource Type:
Journal Article
Resource Relation:
Journal Name: J. Energy; (United States); Journal Volume: 7:3
Country of Publication:
United States
Language:
English
Subject:
17 WIND ENERGY; TURBINE BLADES; AERODYNAMICS; TILT MECHANISMS; WIND TURBINES; CONTROL SYSTEMS; AIR FLOW; ALTERNATORS; AMPLITUDES; COMPARATIVE EVALUATIONS; HYDRAULIC CONTROL DEVICES; INCIDENCE ANGLE; OSCILLATIONS; POSITIONING; RELIABILITY; ROTORS; SPEED REGULATORS; TORQUE; CONTROL EQUIPMENT; ELECTRIC GENERATORS; EQUIPMENT; FLUID FLOW; FLUID MECHANICS; GAS FLOW; MACHINERY; MECHANICS; TURBINES; TURBOMACHINERY 170602* -- Wind Energy Engineering-- Turbine Design & Operation

Citation Formats

Hohenemser, K.H., and Swift, A.H.P. Wind turbine speed control by automatic yawing. United States: N. p., 1983. Web. doi:10.2514/3.62656.
Hohenemser, K.H., & Swift, A.H.P. Wind turbine speed control by automatic yawing. United States. doi:10.2514/3.62656.
Hohenemser, K.H., and Swift, A.H.P. Sun . "Wind turbine speed control by automatic yawing". United States. doi:10.2514/3.62656.
@article{osti_6761629,
title = {Wind turbine speed control by automatic yawing},
author = {Hohenemser, K.H. and Swift, A.H.P.},
abstractNote = {A yaw dynamics analysis was developed for a two-bladed horizontal axis wind turbine with passive cyclic pitch variation achieved by letting the blade pair freely oscillate about a common axis with which the blades formed a small prelag angle. This type of rotor was found capable of high yaw rates without imposing vibratory hub moments and without producing noticeable flapping amplitudes. Experiments were conducted with a tail vane stabilized 7.6-m-diam wind rotor driving a three-phase alternator tuned and loaded to produce a rotor torque proportional to the square of the rotor speed. Two yaw control systems which replaced the usual blade feathering controls were investigated: an active yaw control system using a hydraulic rotor speed governor, and a passive system responding to a combination of rotor thrust and torque. During strong gusts both systems limited rotor speed quite accurately. The passive system appeared to be more promising because of its greater reliability and because of the greater ease of adapting it to larger size wind turbines.},
doi = {10.2514/3.62656},
journal = {J. Energy; (United States)},
number = ,
volume = 7:3,
place = {United States},
year = {Sun May 01 00:00:00 EDT 1983},
month = {Sun May 01 00:00:00 EDT 1983}
}