Study On Hydrodynamic Characteristics And Mooring System Of Floating Solar Energy Base

As the process of industrialization intensifies,the demand of energy in the world has grown drastically.But the fossil resources that can be acquired and explored have gradually become used up.People have begun to turn their attention to clean energy that is easily accessible.The main energy support of china are still oil,coal,natural gas,etc.Due to the sustainable development and environmental protection,it is necessary to develope the renewable energy equipement.In the Huaihe River region,the development of floating solar energy industry is being vigorously promoted.Therefore,it is significant to study the hydrodynamic performance and the mooring system of floating solar platform under the environment loads.In this paper,the floating solar platform in the subsidence area is taken as a research object.Based on the analysis of the frequency domain and the environment loads,the time domain analysis is used to calculate the motion response and mooring cable force.The contents are as follows:(1)The parameters in frequency domain were studied using AQWA including added mass,radiation damping,response amplitude operator and wave excitation force.The influence of shape,weight reduction and floating body distance were investigated on the hydrodynamic coefficients.The results show that the added mass and radiation damping depends on the projection of the structure surface on each coordinate axis plane.The vertical added mass of the floating solar base after weight reduction is greatly reduced,as well as the radiation damping and wave excitation force.In high frequency stage,the distance between the floats has a greater effect on the hydrodynamic characteristics.(2)Based on the Fluent,the wind load and current load of the floating solar energy are calculated using the turbulent model and closure equation.The wind and current loads were obtained in the cases of different incoming direction angle of wind and current,tilt angle of the photovoltaic panel,and wind and current velocity.Based on this,the wind load and current load of double floating bodies were calculated.The calculation results show that the wind and current loads are proportional to the square of the speed.The wind and current loads are greatly affected by the incoming direction.The wind load increases with the increase of the tilt angle of the photovoltaic panel.The wind load on the leeward side is greater than that on the windward side.For the double floating structure,the wind load of the front floating body is greate than the one in the back.(3)The wave height and period were chosed by the empirical formulas.The response of the floating base were studied with two kinds of mooring system as catenary and tension.The water level in this area is large and the mooring system designed on high water level.The results show that both mooring systems can work well.In the lower water level,the motion of the floating system with the catenary mooring system is smaller than the tension one,so as the cable force.At the higher water level,the motion response of the structure under the tension mooring system is smaller.Catenary mooring system can better adapt to water level changes.(4)A new type of mooring system was proposed for the changes in water depths,which combined the pile-base type and the floating mooring system.The motion response of the floating solar base and the cable force were analyzed at different water depths with the new type mooring system.The results show that the device can work in the case of small body distance.The motion response is smaller than the tensioned and catenary moorings.