Robust Model Reference Adaptive Control Design for Wind Turbine Speed Regulation Simulated by Using FAST
Publication: Journal of Energy Engineering
Volume 144, Issue 2
Abstract
As the wind turbine structure flexibility is increased with its larger power capacity, the control system plays a more important role in the effective wind energy generation. This paper presents a robust model reference adaptive control (RMRAC) scheme for turbine speed regulation in the high wind speed region. The existing model reference control (MRC) is designed with respect to the linearized turbine dynamics at the selected operating point, and the adaptive law is introduced that is capable of adjusting the MRC parameters continuously to handle the varying system dynamics. In addition to model reference adaptive control (MRAC), disturbance accommodating control (DAC) is introduced to explicitly cancel out wind disturbances. The authors employ a robust modification mechanism, dead zone with dynamic normalization, to further improve the stability and robustness of the RMRAC. The proposed RMRAC scheme is verified using the high-fidelity turbine simulator FAST, which models an actual utility-scale wind turbine, CART3, located at the National Wind Technology Center (NWTC) in the United States. The proposed scheme is fully evaluated and compared to the baseline linear controls under various wind conditions generated by TurbSim. Under RMRAC, simulation results indicate more accurate generator speed and rotor power regulation performance, as well as enhanced robustness of the closed-loop system.
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Acknowledgments
The authors gratefully acknowledge the contributions and supports from Andrew Scholbrock, Paul Fleming, and Eduard Muljadi of the National Wind Technology Center, National Renewable Energy Laboratory.
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Published In
Journal of Energy Engineering
Volume 144 • Issue 2 • April 2018
Copyright
©2018 American Society of Civil Engineers.
History
Received: May 1, 2017
Accepted: Sep 12, 2017
Published online: Jan 29, 2018
Published in print: Apr 1, 2018
Discussion open until: Jun 29, 2018
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