Yawing of wind turbines with blade cyclic-pitch variation. Final report
The horizontal axis wind turbine under study incorporates two features: the application of blade cyclic pitch variation adopted from rotorcraft technology, and the use of yaw angle control, not only for wind direction following, but also for rotor speed or torque control. Cyclic pitch variation in a two-bladed rotor relieves the blades of all the gyroscopic and odd harmonic aerodynamic root moments. It makes rapid yaw rates of a two-bladed rotor possible without causing vibratory hub moments and without causing appreciable angular excursions of the blade tip path plane. Due to the allowable rapid yaw rates of wind turbines with blade cyclic pitch variation, the two conventional separate control systems - yaw control for wind direction following and blade feathering control for regulating rotor speed and torque - can be replaced by a system with only a single control variable, the rotor yaw angle.
- Research Organization:
- Solar Energy Research Inst. (SERI), Golden, CO (United States); Washington Univ. Technology Associates, Inc., St. Louis, MO (USA)
- DOE Contract Number:
- AC02-77CH00178
- OSTI ID:
- 5984308
- Report Number(s):
- SERI/TR-8085-3-T2; ON: DE81029639
- Country of Publication:
- United States
- Language:
- English
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