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Title: E ects of Increasing Tip Speed on Wind Turbine Rotor Design.


Abstract not provided.

Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Wind and Water Technologies Office (EE-4W)
OSTI Identifier:
Report Number(s):
DOE Contract Number:
Resource Type:
Resource Relation:
Conference: Proposed for presentation at the 2015 NREL Systems Engineering Workshop held January 14-15, 2015 in Boulder, CO.
Country of Publication:
United States

Citation Formats

Resor, Brian Ray. E ects of Increasing Tip Speed on Wind Turbine Rotor Design.. United States: N. p., 2015. Web.
Resor, Brian Ray. E ects of Increasing Tip Speed on Wind Turbine Rotor Design.. United States.
Resor, Brian Ray. 2015. "E ects of Increasing Tip Speed on Wind Turbine Rotor Design.". United States. doi:.
title = {E ects of Increasing Tip Speed on Wind Turbine Rotor Design.},
author = {Resor, Brian Ray},
abstractNote = {Abstract not provided.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2015,
month = 1

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  • A reduction in cost of energy from wind is anticipated when maximum allowable tip velocity is allowed to increase. Rotor torque decreases as tip velocity increases and rotor size and power rating are held constant. Reduction in rotor torque yields a lighter weight gearbox, a decrease in the turbine cost, and an increase in the capacity for the turbine to deliver cost competitive electricity. The high speed rotor incurs costs attributable to rotor aero-acoustics and system loads. The increased loads of high speed rotors drive the sizing and cost of other components in the system. Rotor, drivetrain, and tower designsmore » at 80 m/s maximum tip velocity and 100 m/s maximum tip velocity are created to quantify these effects. Component costs, annualized energy production, and cost of energy are computed for each design to quantify the change in overall cost of energy resulting from the increase in turbine tip velocity. High fidelity physics based models rather than cost and scaling models are used to perform the work. Results provide a quantitative assessment of anticipated costs and benefits for high speed rotors. Finally, important lessons regarding full system optimization of wind turbines are documented.« less
  • The concept of a one-bladed horizontal-axis wind turbine has been of interest to wind turbine designers for many years. Many designs and economic analyses of one-bladed wind turbines have been undertaken by both United States and European wind energy groups. The analyses indicate significant economic advantages but at the same time, significant dynamic response concerns. In an effort to develop a broad data base on wind turbine design and operations, the NASA Wind Energy Project Office has tested a one-bladed rotor at the NASA/DOE Mod-0 Wind Turbine Facility. This is the only known test on an intermediate-sized one-bladed rotor inmore » the United States. The 15.2-meter-radius rotor consists of a tip-controlled blade and a counterweight assembly. A rigorous test series was conducted in the Fall of 1985 to collect data on rotor performance, drive train/generator dynamics, structural dynamics, and structural loads. This report includes background information on one-bladed rotor concepts, the Mod-0 one-bladed rotor test configuration, supporting design analysis, the Mod-O one-bladed rotor test plan, and preliminary test results.« less
  • The combination of variable speed operation and yaw control for power regulation is an interesting option for two-bladed teetered rotor wind turbines. The Italian Gamma 60 turbine, for example, is a 60 meter diameter turbine with these features. The 7.6 m diameter teetered rotor test facility at the University of Texas at El Paso is in the process of being fitted with a mechanical variable speed transmission and power electronics for an induction generator to investigate these two variable speed options. The test bed also has a yaw drive system that is capable of regulating power and loss of loadmore » overspeed by passive yaw control. One significant finding of the control study presented in this paper is an indication that suitable combinations of shaft uptilt and thrust offset together with variable speed operation may allow the design of a downwind, free-yaw turbine with passive yaw control for overspeed protection. The results are preliminary, however, and further investigation is required to determine the free yaw characteristics over the full range of wind speeds.« less