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Title: A conservative control strategy for variable-speed stall-regulated wind turbines

Abstract

Simulation models of a variable-speed, fixed-pitch wind turbine were investigated to evaluate the feasibility of constraining rotor speed and power output without the benefit of active aerodynamic control devices. A strategy was postulated to control rotational speed by specifying the demanded generator torque. By controlling rotor speed in relation to wind speed, the aerodynamic power extracted by the blades from the wind was manipulated. Specifically, the blades were caused to stall in high winds. In low and moderate winds, the demanded generator torque and the resulting rotor speed were controlled to cause the wind turbine to operate near maximum efficiency. Using the developed models, simulations were conducted of operation in turbulent winds. Results indicated that rotor speed and power output were well regulated. Preliminary investigations of system dynamics showed that, compared to fixed-speed operation, variable-speed operation caused cyclic loading amplitude to be reduced for the turbine blades and low-speed shaft and slightly increased for the tower loads. This result suggests a favorable impact on fatigue life from implementation of the proposed control strategy.

Authors:
; ;
Publication Date:
Research Org.:
National Renewable Energy Lab., Golden, CO (US)
Sponsoring Org.:
US Department of Energy (US)
OSTI Identifier:
754586
Report Number(s):
NREL/CP-500-24791
TRN: AH200012%%44
DOE Contract Number:  
AC36-99GO10337
Resource Type:
Conference
Resource Relation:
Conference: 19th American Society of Mechanical Engineers (ASME) Wind Energy Symposium, Reno, NV (US), 01/10/2000--01/13/2000; Other Information: PBD: 8 Feb 2000
Country of Publication:
United States
Language:
English
Subject:
17 WIND ENERGY; WIND TURBINES; CONTROL THEORY; WIND POWER; ENERGY EFFICIENCY; COMPUTERIZED SIMULATION; TURBULENCE; WIND LOADS; STRESSES; FATIGUE; VARIABLE-SPEED; STALL-REGULATED

Citation Formats

Muljadi, E., Pierce, K., and Migliore, P. A conservative control strategy for variable-speed stall-regulated wind turbines. United States: N. p., 2000. Web. doi:10.2514/6.2000-31.
Muljadi, E., Pierce, K., & Migliore, P. A conservative control strategy for variable-speed stall-regulated wind turbines. United States. doi:10.2514/6.2000-31.
Muljadi, E., Pierce, K., and Migliore, P. Tue . "A conservative control strategy for variable-speed stall-regulated wind turbines". United States. doi:10.2514/6.2000-31. https://www.osti.gov/servlets/purl/754586.
@article{osti_754586,
title = {A conservative control strategy for variable-speed stall-regulated wind turbines},
author = {Muljadi, E. and Pierce, K. and Migliore, P.},
abstractNote = {Simulation models of a variable-speed, fixed-pitch wind turbine were investigated to evaluate the feasibility of constraining rotor speed and power output without the benefit of active aerodynamic control devices. A strategy was postulated to control rotational speed by specifying the demanded generator torque. By controlling rotor speed in relation to wind speed, the aerodynamic power extracted by the blades from the wind was manipulated. Specifically, the blades were caused to stall in high winds. In low and moderate winds, the demanded generator torque and the resulting rotor speed were controlled to cause the wind turbine to operate near maximum efficiency. Using the developed models, simulations were conducted of operation in turbulent winds. Results indicated that rotor speed and power output were well regulated. Preliminary investigations of system dynamics showed that, compared to fixed-speed operation, variable-speed operation caused cyclic loading amplitude to be reduced for the turbine blades and low-speed shaft and slightly increased for the tower loads. This result suggests a favorable impact on fatigue life from implementation of the proposed control strategy.},
doi = {10.2514/6.2000-31},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2000},
month = {2}
}

Conference:
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