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Title: Analytical expressions for maximum wind turbine average power in a Rayleigh wind regime

Average or expectation values for annual power of a wind turbine in a Rayleigh wind regime are calculated and plotted as a function of cut-out wind speed. This wind speed is expressed in multiples of the annual average wind speed at the turbine installation site. To provide a common basis for comparison of all real and imagined turbines, the Rayleigh-Betz wind machine is postulated. This machine is an ideal wind machine operating with the ideal Betz power coefficient of 0.593 in a Rayleigh probability wind regime. All other average annual powers are expressed in fractions of that power. Cases considered include: (1) an ideal machine with finite power and finite cutout speed, (2) real machines operating in variable speed mode at their maximum power coefficient, and (3) real machines operating at constant speed.
Authors:
Publication Date:
OSTI Identifier:
420358
Report Number(s):
NREL/CP-440-21671; CONF-970135-8
ON: DE97000088; TRN: 97:000734
DOE Contract Number:
AC36-83CH10093
Resource Type:
Conference
Resource Relation:
Conference: 16. American Society of Mechanical Engineers wind energy symposium, Reno, NV (United States), 6-9 Jan 1997; Other Information: PBD: Dec 1996
Research Org:
National Renewable Energy Lab., Golden, CO (United States)
Sponsoring Org:
USDOE Assistant Secretary for Energy Efficiency and Renewable Energy, Washington, DC (United States)
Country of Publication:
United States
Language:
English
Subject:
17 WIND ENERGY; WIND POWER; CALCULATION METHODS; WIND TURBINES; MATHEMATICAL MODELS