Study On Wind Load Structural Shape Coefficient Of Irregular Photovoltaic Array

Solar photovoltaic power stations are usually built in the area where strong breeze appears frequently,and wind load is the control load of solar photovoltaic panels.Regarding calculating the wind load of structure,the shape factor affects the outcome significantly.Contemporarily,the wind load shape coefficient employed in the wind resistant design of photovoltaic panels is usually referred to the existing domestic Code for design of photovoltaic power station and Load code for the design of building structures.However,the value provided by the principals is only for single photovoltaic panel,while the influence of the shielding effect of photovoltaic panels on the wind load shape factor is not considered.This might lead to security problems of photovoltaic stents,and cause a huge waste of materials as well.Therefore,it is of great practical value to carry out the research on the solar panel array shape coefficient.Based on the characteristics of numerous solar panel arrays and large squares occupied,this research studies the modeling method suitable for the numerical simulation of photovoltaic array group.Through the numerical wind tunnel simulation for four kinds of rectangular array groups including the regular rectangular array group,the rectangular array group with the lateral road,the rectangular array group with the vertical road and the rectangular array group with an open space,the study has been found that the maximum value of the first rows PV wind load shape coefficient can reach to +1.25 at 0 degree wind angle;The coefficient of the twelfth rows of PV panels reaches the maximum value of-1.30 at 180 degree wind angle;The PV panels shape coefficient of first rows and horizontal road at the entrance is the biggest,which the maximum value is +1.00 at 45 degree wind angle;The PV panels shape coefficient of twelfth rows of PV panels shape coefficient and horizontal road at the entrance is the biggest,the maximum value is-1.10 at 135 degree wind angle.The PV panels shape coefficient of PV panels at outside array group,both sides of vertical road and the array space nook is larger.Shape coefficient reaches the maximum at 45 degree and 135 degree,the value is ±0.70.In the other areas,the wind load shape coefficient is the least.This study executes a wind tunnel simulation on 10 MWp PV panel array in Ali,Tibet.The PV arrays are partitioned in accordance with the produced wind load shape coefficient values of each PV panel.Meanwhile,comparing the maximum values of the shape coefficients among all regions with the current Code for design of photovoltaic power station and Load code for the design of building structures of our country at 0 degree,67.5 degree and 180 degree wind angle,it infers that the wind load shape coefficient of region I is similar with the value of two codes;the wind load shape coefficient of region II is smaller than the code value 50%~60%;the wind load shape coefficient of region III is smaller than the code value 70% and more.