An investigation of the performance of a model-based periodic gain controller is presented for a two-bladed, variable-speed, horizontal-axis wind turbine. Performance is based on speed regulation using full-span collective blade pitch. The turbine is modeled with five degrees-of-freedom; tower fore-aft bending, nacelle yaw, rotor position, and flapwise bending of each blade. An attempt is made to quantify what model degrees-of-freedom make the system most periodic, using Floquet modal properties. This justifies the inclusion of yaw motion in the model. Optimal control ideas are adopted in the design of both periodic and constant gain full-state feedback controllers, based on a linearized periodic model. Upon comparison, no significant difference in performance is observed between the two types of control in speed regulation.
Full-State Feedback Control of a Variable-Speed Wind Turbine: A Comparison of Periodic and Constant Gains
Contributed by the Solar Energy Division of the THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS for publication in the ASME JOURNAL OF SOLAR ENERGY ENGINEERING. Manuscript received by the ASME Solar Energy Division, March, 2001; final revision July 2001. Associate Editor: D. Berg.
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Stol, K., and Balas, M. (July 1, 2001). "Full-State Feedback Control of a Variable-Speed Wind Turbine: A Comparison of Periodic and Constant Gains ." ASME. J. Sol. Energy Eng. November 2001; 123(4): 319–326. https://doi.org/10.1115/1.1412237
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