A comparative study of fully coupled and de-coupled methods on dynamic behaviour of floating wind turbine drivetrains

RENEWABLE ENERGY

卷:179

Article

Wang, Shuaishuai¹  Moan, Torgeir^1,2  Nejad, Amir R.¹ 

[1] Norwegian Univ Sci & Technol NTNU, Dept Marine Technol, Gjovik, Norway

[2] NTNU, Ctr Autonomous Marine Operat & Syst AMOS, Dept Marine Technol, NO-7491 Trondheim, Norway

关键词: Floating wind turbine;    Drivetrain;    Fully coupled method;    De-coupled method;    Fatigue damage;    Comparative study;   

DOI  :  10.1016/j.renene.2021.07.136

来源: Elsevier

【 摘 要 】

Traditionally, drivetrain responses are obtained by a de-coupled analysis, which first involves a global analysis with a simplified representation of the drivetrain, followed by a detailed analysis of the drivetrain with the input of global response on the drivetrain interface. As the wind turbine size increases, it is questionable whether this de-coupled analysis method yields sufficiently accurate results. To address this question, a comparative study of the drivetrain dynamic behaviour obtained by a fully coupled method and a de-coupled one, is conducted and reported in this paper. A 10-MW fully coupled aero-hydro-servo-elastic floating wind turbine dynamic model is developed, including a high-fidelity drivetrain. The developed fully coupled model is assessed to be reasonable via the comparison of drivetrain first-order natural frequency and code-to-code comparisons in terms of global responses between two simulation tools Simpack and Fast. Resonance analysis of the 10-MW drivetrain in the fully coupled model is performed, with focus on rotor-drivetrain-bedplate-tower coupled modes in the low frequency range. Time domain simulations of the drivetrain in the fully coupled and the de-coupled models are carried out in different environmental conditions. One-hour fatigue damage of drivetrain gears and bearings in the fully coupled and de-coupled models are compared. Effect of nacelle motion on drivetrain fatigue damage in the de-coupled analysis is discussed. The results are presented to demonstrate whether the de-coupled method could be confidently used for drivetrain dynamic analysis. This study provides a basis for drivetrain design and dynamic analysis in floating wind turbines. (c) 2021 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).

【 授权许可】

Free