A Simplified Modeling Approach of Floating Offshore Wind Turbines for Dynamic Simulations

Javier López-Queija, Eider Robles, Jose Ignacio Llorente, Imanol Touzon and Joseba López-Mendia
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Javier López-Queija: TECNALIA, Basque Research and Technology Alliance (BRTA), Parque Tecnológico de Bizkaia Astondo Bidea, Edificio 700 E, 48160 Derio, Spain
Eider Robles: TECNALIA, Basque Research and Technology Alliance (BRTA), Parque Tecnológico de Bizkaia Astondo Bidea, Edificio 700 E, 48160 Derio, Spain
Jose Ignacio Llorente: Mechanical Engineering Department, University of the Basque Country UPV/EHU, 48013 Bilbao, Spain
Imanol Touzon: TECNALIA, Basque Research and Technology Alliance (BRTA), Parque Tecnológico de Bizkaia Astondo Bidea, Edificio 700 E, 48160 Derio, Spain
Joseba López-Mendia: TECNALIA, Basque Research and Technology Alliance (BRTA), Parque Tecnológico de Bizkaia Astondo Bidea, Edificio 700 E, 48160 Derio, Spain

Energies, 2022, vol. 15, issue 6, 1-16

Abstract: Currently, floating offshore wind is experiencing rapid development towards a commercial scale. However, the research to design new control strategies requires numerical models of low computational cost accounting for the most relevant dynamics. In this paper, a reduced linear time-domain model is presented and validated. The model represents the main floating offshore wind turbine dynamics with four planar degrees of freedom: surge, heave, pitch, first tower fore-aft deflection, and rotor speed to account for rotor dynamics. The model relies on multibody and modal theories to develop the equation of motion. Aerodynamic loads are calculated using the wind turbine power performance curves obtained in a preprocessing step. Hydrodynamic loads are precomputed using a panel code solver and the mooring forces are obtained using a look-up table for different system displacements. Without any adjustment, the model accurately predicts the system motions for coupled stochastic wind–wave conditions when it is compared against OpenFAST, with errors below 10% for all the considered load cases. The largest errors occur due to the transient effects during the simulation runtime. The model aims to be used in the early design stages as a dynamic simulation tool in time and frequency domains to validate preliminary designs. Moreover, it could also be used as a control design model due to its simplicity and low modeling order.

Keywords: floating offshore wind turbine; simplified model; FOWT dynamics; aerodynamics; hydrodynamics; structural dynamics (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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