Study On Wind Load Characteristics And Wind-induced Response Of Solar Photovoltaic Panels

Wind load is the main concern in the design of the solar photovoltaic panels.The photovoltaic panels are prone to vibration and damage under the action of wind load.The wind load of solar photovoltaic panels is affected by various parameters such as wind direction angle and inclination angle.The influence of wind direction angle,inclination angle,wind field type,position and other parameters on the wind load characteristics of stationary solar photovoltaic panels are studied through the rigid model pressure measuring wind tunnel test.At the same time,the influence of wind direction angle,inclination angle,incoming flow speed and other parameters on the wind-induced response of tracking solar photovoltaic panels are studied through the elastic model vibration wind tunnel test.The result of research shows that:(1)As the wind direction angle increases,the pressure coefficient of the photovoltaic panels decreases at first and then increases.Generally,the extreme values are obtained at the wind direction angle α=0°,135° and 180°.The pressure coefficient of photovoltaic panels increases with the increase of inclination angle,and relative to the wind direction angle,installation location,wind field type and other factors,the wind load of photovoltaic panels is more sensitive to the inclination angle.When the incoming current flows through the photovoltaic panels from the front,the wind loads on the photovoltaic panels at different positions are roughly the same.When the incoming current flows through the photovoltaic panels from the oblique direction,the pressure coefficient of the photovoltaic panels at the edge is greater than that of the photovoltaic panels at the middle position.Under wind field A and B,the pressure coefficient of photovoltaic panels under wind field B is slightly larger.(2)For the photovoltaic panels with inclination angle β≤15°,when the incoming wind speed reaches the critical vibration wind speed,the vibration phenomenon of the photovoltaic panels will occur.When the inclination angle of the photovoltaic panels β>15°,the vibration amplitude of the photovoltaic panel is small and can be ignored,so it can be considered that the photovoltaic panels with the inclination angle β>15° don’t have vibration phenomenon.Compared with the front facing the wind,the photovoltaic panels with the back facing the wind are more prone to vibration.(3)The vibration time history curve of the photovoltaic panels is not symmetric about 0°,but offset.At different wind direction angles,the positive maximum value of the vibration time history curve of the photovoltaic panels is greater than the maximum value of the negative absolute value.The vibration amplitude of photovoltaic panels increases with the increase of wind speed.(4)Compared with the photovoltaic panels without vibration,the average wind pressure coefficient of the photovoltaic panels that vibrated at the critical vibration wind speed changed less,the pulsating wind pressure coefficient and the pulsation values of the bending moment coefficient around the X-axis increased significantly.The influence of vibration on the pulsating wind pressure of the photovoltaic panels was mainly concentrated at the near wind end.