Research On Wind Pressure Distribution Of Large-scale Tracking Photovoltaic Power Generation Array Based On Supercomputing

In today’s world,human society is developing rapidly and the demand and use of energy are also increasing.The primary energy stored in nature is limited and the phenomenon of energy scarcity is gradually emerging.In order to alleviate the energy crisis and protect the ecological environment,human beings have shifted their attention to the development and utilization of renewable energy.Compared with other energy sources,clean and pollution-free solar energy has unique advantages and has attracted the attention of countries all over the world.Nowadays,solar photovoltaic power generation technology is becoming more and more mature.The solar tracking photovoltaic modules used for photovoltaic power generation belong to outdoor low-rise buildings.Compared with the traditional fixed photovoltaic power generation system,the pitch angle of tracking photovoltaic modules can change with the change of the sun’s position,and its sensitivity to wind loads is stronger.Under strong wind conditions,the operation of solar tracker may be unstable,which will affect the tracking accuracy and easily lead to wind-induced damage.For the structural design of tracking photovoltaic system,it is necessary to ensure that it can work and operate normally under wind force 6,and that the structure will not be damaged under wind force 8.The information about the influence of wind on photovoltaic array structure in existing building codes is not comprehensive enough.Therefore,it is necessary to study the wind pressure distribution of large-scale tracking photovoltaic modules,which can provide some guidance for the wind-resistant design of tracking photovoltaic support structure.In this paper,CFD numerical simulation technique is used to simulate the wind pressure distribution of a single photovoltaic module with different aspect ratios,and the influence of different aspect ratios on the average wind pressure distribution on the surface of photovoltaic modules is explored.In addition,the numerical simulation of wind pressure distribution on the surface of large-scale photovoltaic arrays are also carried out,and the distribution characteristics of average wind pressure and fluctuating wind pressure on the surface of photovoltaic modules are obtained.The main contents are as follows:(1)The wind tunnel pressure test and CFD numerical simulation of a single heliostat model are carried out to obtain the average wind pressure distribution law on the surface of the heliostat.By comparing the calculation results obtained by the two research methods,it is found that the simulation results are in good agreement with the wind tunnel test results,thus verifying the reliability of the CFD numerical simulatio n method.(2)The PV module models with different aspect ratios are established,and the aspect ratios of the module panels are 1.51,3.77,and 7.68,respectively.Using FLUENT17.0 software,the simulation calculation of photovoltaic modules with different incoming wind angles are carried out to obtain the distribution of the average wind pressure coefficient on the surface of photovoltaic modules under various working conditions.Through comparative analysis,it is found that increasing the aspect ratio of photovoltaic module has less effect on the distribution form of average wind pressure on the surface of photovoltaic module,and more effect on the maximum value and minimum value of average wind pressure coefficient.With the increase of the aspect ratio of photovoltaic module,the maximum value of average wind pressure coefficient on the surface of photovoltaic module increases,while the minimum value of average wind pressure coefficient has the tendency to decrease.(3)A large-scale photovoltaic array model is established,and the wind pressure distribution on the surface of the photovoltaic module groups under different wind angles is studied by numerical simulation using the supercomputer of the National Supercomputing Changsha Center.The average wind pressure distribution law and fluctuating wind pressure distribution characteristics of photovoltaic modules at typical positions of photovoltaic arrays are obtained.