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TECHNICAL PAPERS

Scale and Lag Effects on Control of Aerodynamic Power and Loads on a HAWT Rotor

[+] Author and Article Information
P. J. Moriarty, A. J. Eggers, K. Chaney, W. E. Holley

RANN Inc., 744 San Antonio Rd., Suite 26, Palo Alto, CA 94303 e-mail: ranninc@pacbell.net

J. Sol. Energy Eng 123(4), 339-345 (Jun 01, 2001) (7 pages) doi:10.1115/1.1408305 History: Received March 01, 2001; Revised June 01, 2001
Copyright © 2001 by ASME
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References

Eggers, A. J., Ashley, H., Rock, S. M., Chaney, K., and Digumarthi, R., 1995, “Aerodynamic Control of Fluctuating Loads on Teetered HAWT Rotors,” Proc. of 16th ASME Wind Energy Symp., Reno, NV, pp. 31–34.
Eggers,  A. J., Ashley,  H., Rock,  S. M., and Chaney,  K., 1996, “Effects of Blade Bending on Aerodynamic Control of Fluctuating Loads on Teetered HAWT Rotors,” ASME J. Sol. Energy Eng., 118, No. 4, pp. 239–245.
Eggers, A. J., Holley, W. E., Chaney, K., and Jennings, C., 1999, “Some Effects of Actuator Lag, Error Sensing, and Non-Uniform Turbulence on Blade Pitch Control of Fluctuating Aerodynamic Loads on HAWTs,” A Collection of the 1999 ASME Wind Energy Symp. Technical Papers Presented at the 37th AIAA Aerospace Sciences Meeting and Exhibit, Reno, NV, pp. 104–109.
Rock, S. M., Eggers, A. J., Moriarty, P. J., and Chaney, K., 2000, “Tradeoffs in Active Control of Aerodynamic Power and Loads on a HAWT Rotor,” A Collection of the 2000 ASME Wind Energy Symposium Technical Papers presented at the 38th AIAA Aerospace Sciences Meeting and Exhibit, Reno, NV.
Hansen, A. C., 1997, Users Guide to the Wind Turbine Dynamics Computer Programs YawDyn and AeroDyn for ADAMS, Version 10.0, Mech. Eng. Dept., Univ. of Utah, June 23, Salt Lake City, UT.
Mandell, J. F., 1993, “Fatigue of Composite Structures,” Session A—Applied Research, Fatigue/Materials, 1993 DOE/NREL Wind Energy Program Review Meeting, Golden, CO.
Downing,  S. D., and Socie,  D. F., 1982, “Simple Rainflow Counting Algorithms,” Int. J. Fatigue, 4, No. 1, pp. 31–34.
Schluter, L. L., and Sutherland, H. J., 1991, User’s Guide for LIFE2’s Rainflow Counting Algorithm, Sandia Report SAND90-2259, Sandia National Laboratory, Albuquerque, NM.

Figures

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Mean pitch angle vs. wind speed
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Closed-loop control: Pitch is used to regulate fluctuating moments
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Blade mass vs. radius for fixed fatigue life of 5×109 rotations
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Fatigue life vs. radius for a fixed blade mass of 2450 kg
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Annual energy capture vs. rotor radius
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Ratio of closed to open-loop mass vs. time constant of actuator lag, τ
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Ratio of closed to open-loop fatigue life vs. time constant of actuator lag, τ
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Ratio of closed to open-loop energy capture vs. time constant of actuator lag, τ
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Comparison of RMS deflection angles
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Comparison of RMS deflection angle rates
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Comparison of RMS deflection angle accelerations
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Simulated mean wind speed
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10-sec. average turbulence intensity
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Total wind speed of simulation
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Sixty seconds of total wind speed data
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Total bending moment in open-loop mode, tavg=10 sec.,tmean=10 sec
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Total bending moment in closed-loop mode, tavg=10 sec.,tmean=10 sec
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Mean power in open-loop mode, tavg=10 sec.,tmean=10 sec
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Mean power in closed-loop mode, tavg=10 sec.,tmean=10 sec

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