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Variable frequency resonant controller for load reduction in wind turbines
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DOI：10.1016/j.conengprac.2017.06.007.png)
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While most loads on wind turbines are originated from wind speed fluctuations, they show a periodic nature with a time-varying frequency proportional to the turbine rotation. This paper exploits this relation and proposes a modified Resonant Controller able to attenuate these frequency-varying periodic disturbances. The resulting controller is designed for both partial and full load wind speed conditions, therefore, it is able to reject periodic loads even when the wind turbine system is subject to changes in the operating rotation speed. Furthermore, a novel piecewise linear representation of the system is presented allowing a systematic design procedure, based on Linear Matrix Inequalities, in order to compute the control parameters. Simulation results in a 2.5 MW large scale three-bladed wind turbine illustrate the proposed method, which is able to reduce the root mean value of blade load up to 12 times when compared to a traditional LPV controller. (C) 2017 Elsevier Ltd. All rights reserved.
Keyword:
Wind turbine control
Periodic disturbance rejection
Robust control
Resonant controller
Internal model principle
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