Iterative Frequency-Domain Response of Floating Offshore Wind Turbines with Parametric Drag
Open Access
- 11 October 2018
- journal article
- research article
- Published by MDPI AG in Journal of Marine Science and Engineering
- Vol. 6 (4), 118
- https://doi.org/10.3390/jmse6040118
Abstract
Methods for coupled aero-hydro-servo-elastic time-domain simulations of Floating Offshore Wind Turbines (FOWTs) have been successfully developed. One of the present challenges is a realistic approximation of the viscous drag of the wetted members of the floating platform. This paper presents a method for an iterative response calculation with a reduced-order frequency-domain model. It has heave plate drag coefficients, which are parameterized functions of literature data. The reduced-order model does not represent more than the most relevant effects on the FOWT system dynamics. It includes first-order and second-order wave forces, coupled with the wind turbine structural dynamics, aerodynamics and control system dynamics. So far, the viscous drag coefficients are usually defined as constants, independent of the load cases. With the computationally efficient frequency-domain model, it is possible to iterate the drag, such that it fits to the obtained amplitudes of oscillation of the different members. The results show that the drag coefficients vary significantly across operational load conditions. The viscous drag coefficients converge quickly and the method is applicable for concept-level design studies of FOWTs with load case-dependent drag.Keywords
Funding Information
- Horizon 2020 Framework Programme (640741)
This publication has 27 references indexed in Scilit:
- The Triple Spar Campaign: Implementation and Test of a Blade Pitch Controller on a Scaled Floating Wind Turbine ModelEnergy Procedia, 2017
- A Formulation for the Unsteady Aerodynamics of Floating Wind Turbines, With Focus on the Global System DynamicsPublished by ASME International ,2017
- Control design methods for floating wind turbines for optimal disturbance rejectionJournal of Physics: Conference Series, 2016
- Demonstration of a coupled floating offshore wind turbine analysis with high-fidelity methodsJournal of Fluids and Structures, 2016
- A study on the aerodynamics of a floating wind turbine rotorRenewable Energy, 2016
- Floating offshore turbinesWires Energy and Environment, 2014
- Measurements and modelling of the power performance of a model floating wind turbine under controlled conditionsWind Energy, 2014
- Effect of wind turbine surge motion on rotor thrust and induced velocityWind Energy, 2012
- Control of floating wind turbinesPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2012
- A method to avoid negative damped low frequent tower vibrations for a floating, pitch controlled wind turbineJournal of Physics: Conference Series, 2007