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Offshore wind power has become an important trend in global renewable energy development. Based on a particle swarm optimization (PSO) algorithm and FAST program, a time-domain coupled calculation model for a floating wind turbine is established, and a combined optimization design method for the wind turbine's blade is developed in this paper. The influence of waves on the power of the floating wind turbine is studied in this paper. The results show that, with the increase of wave height, the power fluctuation of the wind turbine increases and the average power of the wind turbine decreases. With the increase of wave period, the power oscillation amplitude of the wind turbine increases, and the power of the wind turbine at equilibrium position decreases. The optimal design of the offshore floating wind turbine blade under different wind speeds is carried out. The results show that the optimum effect of the blades is more obvious at low and mid-low wind speeds than at rated wind speeds. Considering the actual wind direction distribution in the sea area, the maximum power of the wind turbine can be increased by 3.8% after weighted optimization, and the chord length and the twist angle of the blade are reduced.Energies 2019, 12, 1972 2 of 18 dynamic stall model in the helicopter field, and modifies the working environment of the fixed wind turbine [5,6]. It can basically meet the design requirements of the fixed wind turbine. At present, fixed wind turbine technology has become relatively mature and accomplished commercialization in China and several European countries. However, the floating wind turbine can move freely in the ocean environment. It is always in an obvious oscillation dynamic state under the influence of waves. Continuous oscillation not only causes the dynamic response of the wind turbine, but also enhances the unsteady effect of aerodynamic load, which brings great difficulties to the design and evaluation of floating wind turbine. The technology is still in the primary stage of research and development [7].The offshore floating wind turbine is a very complex system, which mainly consists of the top wind turbine generator set, the tower supporting the wind turbine, the floating platform infrastructure and the mooring positioning system. For the wind turbine generator set alone, blades with excellent aerodynamic performance are the core of wind turbines [8]. Blade design is a complex multi-objective optimization design process, which needs to meet a number of design indicators, such as aerodynamic performance, structural strength and economic characteristics [9]. There are three theoretical research methods: blade element momentum (BEM) method based on momentum conservation; generalized dynamics wake (GDW) based on vortex theory; CFD method by solving N-S equation directly. The BEM method can simply calculate the energy efficiency and the force of horizontal axis impeller. It is effective and fast for estimating the overall load of the impeller. It is suitable for wind turbines with equal blade leng...

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