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Energies 2017, 10(11), 1699; https://doi.org/10.3390/en10111699

Critical Speed Control for a Fixed Blade Variable Speed Wind Turbine

Division of Electricity, Department of Engineering Sciences, Uppsala University, Box 534, 751 21 Uppsala, Sweden
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Academic Editor: Marco Mussetta
Received: 12 September 2017 / Accepted: 23 October 2017 / Published: 25 October 2017
(This article belongs to the Special Issue Wind Generators Modelling and Control)
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Abstract

A critical speed controller for avoiding a certain rotational speed is presented. The controller is useful for variable speed wind turbines with a natural frequency in the operating range. The controller has been simulated, implemented and tested on an open site 12 kW vertical axis wind turbine prototype. The controller is based on an adaptation of the optimum torque control. Two lookup tables and a simple state machine provide the control logic of the controller. The controller requires low computational resources, and no wind speed measurement is needed. The results suggest that the controller is a feasible method for critical speed control. The skipping behavior can be adjusted using only two parameters. While tested on a vertical axis wind turbine, it may be used on any variable speed turbine with the control of generator power. View Full-Text
Keywords: vertical axis wind turbine; variable speed; control; optimal torque; critical speed; speed exclusion zone; natural frequencies; eigenfrequencies vertical axis wind turbine; variable speed; control; optimal torque; critical speed; speed exclusion zone; natural frequencies; eigenfrequencies
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Rossander, M.; Goude, A.; Eriksson, S. Critical Speed Control for a Fixed Blade Variable Speed Wind Turbine. Energies 2017, 10, 1699.

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