Study On The Influence Factors Of Wind Load Of Photovoltaic Arrays

In recent years,with the intensification of global warming and the depletion of fossil energy,the active development and utilization of renewable energy and the reduction of carbon emissions have become the consensus of energy development in the world.As a typical renewable energy,solar energy has the advantages of being clean,safe and inexhaustible,and has become one of the most important new energy sources in the future.The photovoltaic array of a photovoltaic power station is an important terminal for collecting and converting solar energy,and has the characteristics of light weight,poor deformation ability,and sensitivity to external loads.In order to ensure the structural safety of photovoltaic arrays,the research on wind load and its influencing factors has been one of the key issues that experts and engineers focus on.The main factors affecting the wind load of the photovoltaic array include the geometric parameters of the structure and the characteristic parameters of the flow field.Therefore,this paper adopts the method of CFD to systematically study the influence of parameters such as module inclination angle,spacing and wind field conditions on the wind load of photovoltaic structures.The main conclusions are as follows:(1)The wind load of photovoltaic modules is more sensitive to the change of the inclination angle.With the increase of the inclination angle,the body shape coefficient of the module increases,and the shading effect between the longitudinal arrays gradually increases with the increase of the inclination angle.(2)The lateral spacing of photovoltaic modules affects the threedimensional flow field around the photovoltaic array,thereby affecting the wind load.Increasing the lateral spacing within a certain range can reduce the wind load of the photovoltaic modules.Due to the limited flow on both sides of the photovoltaic modules,the body shape coefficient is larger than that of the independent photovoltaic modules,but the overall lateral spacing has less influence on the wind load of the photovoltaic modules.(3)Under the premise of meeting the requirements of the photovoltaic module design specifications,the longitudinal spacing has little effect on the body shape coefficient of the photovoltaic modules,but has a significant impact on the overturning moment coefficient.The increase in the longitudinal spacing leads to a significant increase in the overturning moment coefficient of the photovoltaic modules,thus reduce the stability of PV modules.(4)Under the wind direction of 0° and 180°,the body shape coefficient of the photovoltaic modules is the largest,and at the wind direction of 45° and135°,the standard deviations of force coefficients and moment coefficients of the photovoltaic modules are the largest.(5)Under different wind field conditions,the turbulence intensity of incoming flow has almost no effect on the mean value of the body shape coefficient of photovoltaic modules,but has a greater impact on the standard deviations of the wind load.With the increase of turbulence,the standard deviations of force coefficients and moment coefficients of the module increases.