In the middle of 2013, the offshore installed wind capacity was 6.5 GW in
European countries while by 2020 the total installed capacity is expected to reach 43
GW mainly by application of offshore wind turbines; the growth of offshore wind
industry necessitates introducing concepts with potential of being classed without being much affected by different water
depths. Initially, recent patents of offshore wind turbines are presented in this article. Afterwards, stochastic dynamic motion
responses and generated power of a semisubmersible floating wind turbine for different water depths of 100 m and
200 m are examined for selected environmental conditions. The mooring line design is correspondingly modified to provide
proper station keeping as well as appropriate interactive influence on the dynamic responses of the semisubmersible
wind turbine without affecting the generated power. Fully coupled aero-hydro-servo-elastic numerical models have been
developed and integrated time-domain approach has been applied in order to investigate the dynamics of the semisubmersible
floating wind turbine. The motion responses, mooring lines effective tension as well as wind turbine performance
are compared for different water depths and environmental conditions. Hence, the present semisubmersible floating
wind turbine can be classified which means an optimized design can easily be modified for new offshore site with different
water depth without the need of major modifications.
Keywords: Offshore floating wind turbine, Classification, wind and wave induced dynamics.
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