Coupling Analysis Of Coaxial Array Floats,Platform,Mooring System And Wind Turbine

Global resource consumption and environmental degradation lead to people's increasing interest in the development and utilization of renewable e nergy.Wave energy in ocean energy is considered as one of the most promising renewable energy,which is inexhaustible,clean and pollution-free.Multiple Wave Energy Converters(WECs)system based on floating platform is an important development direction of wave energy utilization,and the research on energy extraction and storage of WECs is the focus of most research institutes,and there are relatively few studies on the coupling of floats and floating platforms and the stability of floating platforms.In this paper,the power generation,mooring and stability of a wave energy generator composed of a platform,coaxial array floats,a mooring system and a wind turbine are studied.In this paper,a three-dimensional numerical model of single float is established based on the software ANSYS AQWA,and the convergence of mesh scale and time step of single float is verified systematically.Compared with the data from physical model test,the results are in good agreement,which verifies the accuracy of calculation.Taking the float of wave power generation platform in real sea area as the object,the optimal damping constant of single float WEC under different sea conditions is studied.It is found that there is an optimal damping constant to maximize the power of single float WEC under each sea condition.The effects of different angles between the incident wave and the float arm on the hydrodynamic performance and power generation of the single float WEC are studied.The results show that under the same damping constant and different sea conditions,the heave response of the single float WEC increases with the increase of the angle,but the average power generation does not absolutely increase with the increase of the angle.Under sea conditions kr = 0.23 and kr = 0.14,the hydrodynamic performance and power generation of the eight floats on the fixed platform,heave platform,pitch platform and free platform were calculated,and the mooring system was designed and the eight floats were calculated.The hydrodynamic performance and power generation under the best mooring mode are studied,and the influence of the presence or absence of floats on the fixed,heave,pitch,free,and floating platforms is studied.The results show that the existence of a stationary pla tform and other stationary floats will increase the wave absorption efficiency of floats,and other moving floats will reduce the wave absorption efficiency of floats.The stability of the platform is very important to the power generation of the float.Wh en operating in the real sea,ensure that the motion range of the platform is not too large.After heaving platform,pitching platform,free platform,floating platform plus eight floats,the amplitude of heave or pitch motion of the platform is smaller,a nd the motion curve converges faster and more regular.The coupling of coaxial array floats,platform,mooring system and wind turbine is studied under different sea conditions.The results show that the influence of the wind turbine on the total power of the floats is small,the wind turbine and the wind load will make the pitch amplitude of the platform larger,and the wind load will increase the tension of the anchor chain on the side of the wind load.The floats and mooring system will increase the stability of the motion and force of the power generation device.The research results of this paper can provide some references for the simulation analysis of the multi-float WEC based on the floating platform and the safe operation of the WEC.