| As the most important supporting system of photovoltaic modules in solar power station,photovoltaic stands system device is a reliable guarantee for maximum utilization of photovoltaic energy.The stand cost accounts for a heavy proportion of the investment in the construction of the whole power station,so the rationality of stand design,cost control and service life have become important ways for the competition of photovoltaic stand industry.This topic based on the Project "horizontal single-axis photovoltaic stand system key technology development and demonstration system of distributed power station" of the Yellow River upstream hydropower development Co.Ltd,studies the photovoltaic stand system in extreme climate in Qing Hai Province and has important engineering significance.Based on the study and comparison of the design specification of Japan,the United States and China,this paper compared the results of finite element fluid calculation with those of Japan and the error is 4.6% by simulating the force of the photovoltaic modules in the wind field by computational fluid dynamics software.Combined with the location characteristics of the project implementation area and considering the cost,the project finally adopted the Japanese calculation method.The observation data of weather stations in the implementation area of the project are analyzed comprehensively,and the optimal tilt angle and wind load parameters of photovoltaic modules are determined.On this basis,we designed the double-girder and horizontal single-axis photovoltaic stand system and its elevating angle adjusting hydraulic push rod mechanism,calculated the parameters of the mechanism,checked the intensity of the structure and solved photovoltaic cell panels components deformation,fracture and other issues in special environment.Based on the finite element method,this paper did static analysis to the photovoltaic stand system,compared the double-girder structure of the girder spacing effect on the structure stress and strain and reduced the cost under the premise that satisfy the structural strength.Because the sudden wind load may cause the vibration deformation of the photovoltaic panel,the photo energy conversion efficiency of the photovoltaic system is reduced.In this paper,Davenport model is used to analyze the spectrum of pulsating wind load.Combined Davenport model with modal analysis of double-girder structure,we came to the conclusion that the double-girder structure can effectively reduce the vibration and deformation caused by wind load,which is conducive to improving the energy conversion efficiency of the photovoltaic system.At last,this paper did the strength test of the double-girder structure.Through the maximum deformation test of latitudinal beam and longitudinal beam under vertical load,the deformation quantity is within the permission of the specification.The test results show that this design of double-girder and horizontal single-axis structure satisfies the requirement of project area of the static stiffness. |
