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Research Papers

Testing State-Space Controls for the Controls Advanced Research Turbine

[+] Author and Article Information
Alan D. Wright, Lee J. Fingersh

National Renewable Energy Laboratory, National Wind Technology Center, 1617 Cole Boulevard, Mailstop 3811, Golden, CO 80401

Mark J. Balas

Electrical and Computer Engineering Department, University of Wyoming, Laramie, WY, 82071

J. Sol. Energy Eng 128(4), 506-515 (Jul 25, 2006) (10 pages) doi:10.1115/1.2349547 History: Received March 02, 2006; Revised July 25, 2006

Control can improve wind turbine performance by enhancing energy capture and reducing dynamic loads. At the National Renewable Energy Laboratory, we are implementing and testing state-space controls on the controls advanced research turbine (CART), a turbine specifically configured to test advanced controls. We show the design of control systems to regulate turbine speed in region 3 using rotor collective pitch and reduce dynamic loads in regions 2 and 3 using generator torque. These controls enhance damping in the first drive train torsion mode. We base these designs on sensors typically used in commercial turbines. We evaluate the performance of these controls by showing field test results. We also compare results from these modern controllers to results from a baseline controller for the CART. Finally, we report conclusions to this work and outline future studies.

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Copyright © 2006 by American Society of Mechanical Engineers
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Figures

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Figure 1

The Controls Advanced Research Turbine (CART)

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Figure 2

Measured shaft torque showing drive train excitation in region 3 using classical control

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Figure 3

FAST-simulated generator speed for the baseline and state-space controllers excited by step winds spanning regions 2 and 3

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Figure 4

Measured generator torque showing stable and unstable behavior during startup for two implemented controllers

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Figure 5

Measured CART data during transition from region 2 to region 3

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Figure 6

Measured CART data during operation in region 3, showing generator pitch interaction in first controller

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Figure 7

Measured CART data for region 2 control for the baseline and state-space case

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Figure 8

Power spectral density of low-speed shaft and generator torque for the region 2 baseline and state-space cases

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Figure 9

Measured CART data for region 3 control for the baseline and state-space case

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Figure 10

Power spectral density of low-speed shaft and generator torque for the region 3 baseline and state-space cases

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