Analysis of Wind Load Interval Division Method of Rooftop PV Bracket System

With the vigorous development of distributed photovoltaic power generation, more and more photovoltaic solar power stations are installed in flat roof industrial plants. However, the turbulent effects of wind caused by the geometry of the house can cause solar modules installed on the roof to withstand significant wind pressure. In order to meet the waterproof and structural requirements of the roof, it is possible to install ballast on the support system.

The traditional method of determining the roof wind load in the project is to use the wind load coefficient in the design standard of the national standard. This method uses a lot of metal materials and is very uneconomical. At the same time, it also poses hidden dangers to the safety of the roof structure. The limited residual capacity of the factory roof can cause safety problems. Therefore, in the design of roof photovoltaic support, a more economical and reasonable roof wind factor determination method is needed.

Based on the domestic and foreign scientific research work, Baowei New Energy Design Engineer from Guangdong, combined with the wind tunnel test report results in Japan and Germany, proposed a method for dividing the wind load interval of the roof photovoltaic support system, including: division on the roof of the building. A corner area c, an edge area r, and a center area f; a wind load coefficient is allocated according to the corner area c, the edge area r, and the center area f: the wind suction coefficient of the corner area c is -1.8; and the wind suction coefficient of the edge area r is − 1.6; The wind suction coefficient of the central region f is -0.6; the ballast load of the photovoltaic support system located in each of the above regions is calculated based on the wind load coefficients of the corner region c, the edge region r, and the center region f.

Using the static mechanical model of the roof photovoltaic support system, the wind load area is divided, the wind load coefficients in different regions are specified, the correct distribution of wind loads is obtained, the optimal ballast solution for the roof photovoltaic support system is obtained, and the classification process is fast ,easy and convenient. According to the calculation of a single MW-level power station, the optimized plan is reduced by more than 10% regardless of the cost of the support or the roof load before the optimized plan. Wu Keyao, CEO of Baowei New Energy Co., Ltd. of Guangdong Province, said that although PV stents account for a small proportion of the cost of the entire photovoltaic power station, Baowei has always insisted on innovation and technological improvement in order to provide customers with safer, more professional and more economical One-stop photovoltaic power plant solutions.

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