Abstract
Over the last several years, the number of offshore wind turbine installations has increased exponentially. A change from shallow to deep marine waters will be seen in future installations. As we move further away from the shore, the loading on the floating offshore wind turbine (FOWT) system increases. This higher load may have a negative impact on the wind turbine's efficiency. It may also lead to power fluctuations, large tower displacements and increased fatigue loads. In order to circumvent these effects, passive secondary devices are installed. A tuned mass damper (TMD) is one such device that may be utilized for load mitigation. In this paper, an efficient method is presented for the design of TMD for FOWT. The design problem is posed as feedback response control problem for the plant represented by the FOWT-TMD system. The design objective is to evaluate the static controller such that the response of the FOWT is minimized. The controller gains correspond to the TMD properties. The TMD parameters are obtained using iterative LMI, which uses a combination of convex and metaheuristic optimization. The proposed TMD is found to be useful in lowering the FOWT response. The methods described in this paper can be utilized to determine the best TMD configuration.
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