Abstract
This paper shows a load assessment method for design of the 7MW offshore wind turbine on V-shaped semi-submersible floating structure, which will be installed off the coast of Fukushima prefecture in the Fukushima Floating Offshore Wind Farm Demonstration Project. We calculated the load of the floating offshore wind turbine by using the coupled model of a wind turbine and a floating structure, which was tuned based on the tank test results. In the load analysis, asymmetric floater response against directional wave was considered. Also stability of the floating offshore wind turbine related to blade pitch control induced vibration was evaluated. It was confirmed that induced vibration converged to small amplitude and did not have significant effect on fatigue and extreme loads.
