Rotor speed control by automatic yawing of two-bladed wind turbines with passive cyclic pitch variation

Conference · Thu Jan 01 00:00:00 EST 1981 · AIAA Pap.; (United States)

OSTI ID:5460268

Hohenemser, K H; Swift, A H.P.

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 diameter 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. Both systems limited during strong gusts 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.

• Research Organization: Washington University, St. Louis, MO
• OSTI ID: 5460268
• Report Number(s): CONF-811205-
• Journal Information: AIAA Pap.; (United States), Vol. 81-2570; Conference: 2. AIWA terrestrial energy systems conference, Colorado Springs, CO, USA, 1 Dec 1981
• Country of Publication: United States
• Language: English

Related Subjects

17 WIND ENERGY
WIND TURBINES
ROTORS
AERODYNAMICS
CONTROL
CONTROL SYSTEMS
MECHANICAL VIBRATIONS
PERFORMANCE TESTING
TURBINE BLADES
VELOCITY
WIND POWER
ENERGY SOURCES
FLUID MECHANICS
MACHINERY
MECHANICS
POWER
RENEWABLE ENERGY SOURCES
TESTING
TURBINES
TURBOMACHINERY
170602* - Wind Energy Engineering- Turbine Design & Operation