Preprints
https://doi.org/10.5194/wes-2021-143
https://doi.org/10.5194/wes-2021-143
14 Mar 2022
 | 14 Mar 2022
Status: this preprint has been withdrawn by the authors.

Adaptive robust observer-based control for structural load mitigation of wind turbines

Edwin Kipchirchir, Manh Hung Do, Jackson Githu Njiri, and Dirk Söffker

Abstract. With growth in the physical size of wind turbines, an increased structural loading of wind turbine components affecting operational reliability is expected. To mitigate structural loading in wind turbines, a novel strategy for structural load mitigation and rotor speed regulation of utility-scale wind turbines in above-rated wind speed region is proposed in this contribution. Spatial and temporal variation of wind speed is responsible for fatigue loading during power production. Previous attempts have proposed advanced control schemes incorporating disturbance models for cancelling the effects of wind disturbances. These controllers are usually designed based on reduced order models of nonlinear wind turbines, hence do not account for modeling errors and nonlinearities. Although robust controllers have been proposed to handle nonlinearities during wind turbine operation, these controllers are designed about specific operating points, hence suffer performance deterioration in changing operating conditions. In this contribution, a robust disturbance accommodating controller (RDAC), which is robust against modeling errors and nonlinearities, is combined with an adaptive independent pitch controller (aIPC), designed to be adaptive to changing operating points due to wind speed variability, to mitigate structural loads in rotor blades and tower and to regulate rotor speed. The proposed control scheme is tested on a 1.5 MW National Renewable Energy Laboratory (NREL) reference wind turbine (RWT). Simulation results show that the proposed method successfully mitigates structural loading in rotor blades and tower without sacrificing rotor speed and power regulation performance in the presence of model uncertainties and changing operating conditions.

This preprint has been withdrawn.

Edwin Kipchirchir, Manh Hung Do, Jackson Githu Njiri, and Dirk Söffker

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Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
Edwin Kipchirchir, Manh Hung Do, Jackson Githu Njiri, and Dirk Söffker
Edwin Kipchirchir, Manh Hung Do, Jackson Githu Njiri, and Dirk Söffker

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This preprint has been withdrawn.

Short summary
In this work, an adaptive control strategy for reducing structural loading in wind turbine components in varying operating conditions is proposed. The motivation for this work is the growing need for fatigue load alleviation and speed regulation trade-off in modern highly flexible wind turbines. The proposed control strategy shows promising results in blades and tower load mitigation without sacrificing the rotor speed regulation performance, in changing operating conditions and uncertainties.
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