ABSTRACT

With the development of wind turbine generation power, the size of wind turbine is getting lager and lager in recently years. The floating offshore wind turbine(FOWT) which has the advantages such as higher wind speeds, lower turbulences, less visual impacts and noise pollution compared with Onshore wind turbine is getting more and more attentions of the world. In present study the Open-FAST Code was used to simulate the aero-hydrodynamic analysis of a floating offshore wind turbine. And the BEM theory with unsteady fixed models and potential theory are used to calculate the aerodynamic force and the hydrodynamic force respectively. The motion response of platform and aero-elastic response of the wind turbine blade are calculated respectively under wind and wave coupling conditions. And the FOWT motion responses under different angles of wind and wave are calculated. The results show that the mean value of every freedom's motion is affected by the wind load and the amplitude of every freedom's motion is affected by the wave load. The blade deformation in flapping direction shows obvious multi-period vibration superposition, which is related to the rotor rotation frequency, wave frequency and tower vibration frequency respectively. The blade vibration in the edge direction is relatively stable. With the increase of the angle of wind and wave, the amplitude of the surge and pitch motion of the FOWT obviously decreases, the amplitude of the sway and roll motion obviously increases, the heave motion slightly decreases, and the yaw motion first decreases and then increases.

INTRODUCTION

In the face of global energy and ecological problems, people are in urgent need of solutions. At present, electricity is the most widely used field with the greatest emission reduction. New energy generation technologies, including photovoltaic, tidal, wind energy and wave energy, have taken an increasing proportion in the total power generation. Wind energy, as one of the most important forms of renewable energy, has been developing rapidly in recent years. In particular, the offshore wind turbine has the advantages of abundant offshore wind resources, low noise pollution, less visual impact and land saving, which is increasing year by year in the proportion of total installed machines. By the end of 2020, the global installed capacity of 6.1GW has been increased. As the Council G. (2021) reported, by the end of 2020, the global installed capacity of offshore wind turbines has reached 35GW, and annual CO2 emission reduction of 62.5 million tons has been achieved.

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