Stochastic dynamic response analysis of a floating vertical-axis wind turbine with a semi-submersible floater: Analysis of a floating vertical-axis wind turbine

Kai Wang, Torgeir Moan, Martin Otto Laver Hansen

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Floating vertical-axis wind turbines (FVAWTs) provide the potential for utilizing offshore wind resources in moderate and deep water because of their economical installation and maintenance. Therefore, it is important to assess the performance of the FVAWT concept. This paper presents a stochastic dynamic response analysis of a 5MW FVAWT based on fully coupled nonlinear time domain simulations. The studied FVAWT, which is composed of a Darrieus rotor and a semi-submersible floater, is subjected to various wind and wave conditions. The global motion, structural response and mooring line tension of the FVAWT are calculated using time domain simulations and studied based on statistical analysis and frequency-domain analysis. The response of the FVAWT is compared under steady and turbulent wind conditions to investigate the effects of turbulent wind. The advantage of the FVAWT in reducing the 2P effect on the response is demonstrated by comparing the floating wind turbine with the equivalent land-based wind turbine. Additionally, by comparing the behaviour of FVAWTs with flexible and rigid rotors, the effect of rotor flexibility is evaluated. Furthermore, the FVAWT is also investigated in the parked condition. The global motions and structural responses as a function of the azimuthal angle are studied. Finally, the dynamic response of the FVAWT in selected misaligned wind and wave conditions is analysed to determine the effects of wind-wave misalignment on the dynamic response.
Original languageEnglish
JournalWind Energy
Volume19
Issue number10
Pages (from-to)1853–1870
ISSN1095-4244
DOIs
Publication statusPublished - 2016

Keywords

  • Renewable Energy, Sustainability and the Environment
  • Coupled nonlinear time domain
  • Dynamic response analysis
  • Floating vertical-axis wind turbine
  • Semi-submersible floater
  • Buoys
  • Dynamic response
  • Frequency domain analysis
  • Mooring
  • Rigid rotors
  • Semisubmersibles
  • Stochastic systems
  • Submersibles
  • Wind power
  • Wind turbines
  • Nonlinear time domain simulations
  • Offshore wind resources
  • Stochastic dynamic response
  • Time domain
  • Time-domain simulations
  • Vertical axis wind turbines
  • Wind wave misalignments
  • Time domain analysis

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