Integrated Design Of Juanyang Facilities And Photovoltaic System

Pond aquaculture is one of the major forms of freshwater aquaculture in China.In recent years,due to the impact of relevant policies and environmental constraints during the process,the development of alternative modes for traditional pond aquaculture must be enforced,especially towards to the environmental-friendly and high-efficient ones.Based on the "zero emission" Pond Juanyang,proposed by the cooperative team and featuring green and efficient,the present study aimed to work on relevant engineering facilities construction,structural design and optimization tasks.The scheme and structural design of photovoltaic system,combined with the structural analysis and optimization of Pond Juanyang platform,were the cores of this work in order to realize the integrated design.The relevant achievements could be practically meaningful in promoting the standardization of engineering facilities of Pond Juanyang,the lightweight research of assembly,and the transformation of pond aquaculture forms to green-efficient direction.The main research contents and conclusions were as follows:(1)Scheme design of the photovoltaic system.Based on the principle and function of Pond Juanyang,engineering facilities construction of the platform with 4 barrels,as a standard design unit,were completed,followed by the scheme design of matching photovoltaic system.Scheme design included design works,such as the determination of installed capacity,equipment selection,installation mode,inclination optimization and photovoltaic module array design,as well as the calculation of power generating capacity.The simulation results of comparing the theoretical power generation with PVsyst software show that the first year power generation of the system was 10604 k Wh,and the power generation efficiency was 83.1 %,and the deviation from the theoretical formula of 10159.2 k Wh was4 %,indicating that the PVsyst prediction data was more accurate.(2)Overall structural and control scheme design of photovoltaic system.Based on the adjustable angle demand of photovoltaic modules and the basic structure of Juanyang platform,the overall structure of the system was consist of bottom supporting components,telescopic mechanism,photovoltaic modules and purlins.Q235 steel and Q345 steel were selectively applied according to the stress difference of components.The initial dimension of various rods inside the structure was checked through the slenderness ratio,and a combination loads of dead load,extreme wind load and snow load was determined as the adverse condition for photovoltaic system structure.The angle control scheme of photovoltaic module was designed,with the mathematical model of fixed adjustable system,the overall design block diagram of system hardware and the overall system flow chart being completed.The yearly optimal inclination and the seasonally regulated inclination determined by the mathematical model were compared with the PVsyst simulation results: the optimal inclination determined by the model was 13 degrees,the annual power generating capacity was 928.87 k Wh/k Wp,the optimal inclination simulated by PVsyst was 22 degrees,and the annual generating capacity was 1071 k Wh/k Wp,resulting in a 13 % deviation between them.Combined with the above photovoltaic system scheme design and analysis,PVsyst simulation data,a22-degree optimal inclination and seasonally regulation angle(15-degree for summer and36-degree for winter)was used as the basis for subsequent structural static analysis.(3)Structural static analysis of photovoltaic-Juanyang integrated platform.According to the previous analysis results,four working conditions were determined: the load combination of structural self-weight +(snow load + crowd load + operation load)as condition 1,with the inclination angle of photovoltaic modules being 0 degree.The load combinations of structural dead weight + extreme wind load +(snow load + crowd load +operation load),combined with an inclination angle of 15-degree,22-degree and 36-degree respectively,sequentially as condition 2,condition 3 and condition 4.The results of static analysis based on ANSYS Workbench demonstrated that the maximum stress under conditions 1,2,3 and 4 were 253.4 MPa,82.163 MPa,77.329 MPa and 67.112 MPa respectively.The maximum stress under each working condition occurs at the hinge between the electric push rod and the beam and at the limit block.The maximum stress The material at this position was Q345 steel,of which the yield strength was adequate.The deformations were 3.454 mm,5.576 mm,5.517 mm and 5.208 mm respectively.The maximum deformation of condition 1 occurred on the photovoltaic panel and the maximum deformation of others existed on the beam.According to the specification,the allowable deflection of photovoltaic panel is 16.896 mm and the allowable deflection of beam is 13.5 mm.Therefore,the maximum deformation of each condition was less than the allowable deflection.In summary,the structural strength and stiffness of photovoltaic-Juanyang integrated platform meets the requirements of relevant specifications.Based on the design exploration optimization module in ANSYS,the structure of the main rods of the platform would be optimized,with the wall thickness as the design variable,ranging from 2 mm to 6 mm,and the mass,maximum equivalent stress and deformation were taken as the objective function.The consequences of response surface optimization manifested that when the wall thickness was 2.4 mm,the steel consumption could be reduced by 19 %,which achieves the purpose of structural lightweight.At the same time,the sensitivity analysis of the design variables exhibited that the wall thickness was positively correlated with the mass and negatively correlated with the maximum equivalent stress and deformation.