Wind-Induced Vibration Characteristics and Shading Effects of a Double-Layer Cable-Supported Photovoltaic Module System Based on Wind Tunnel Test

The double-layer (DL) cable-supported photovoltaic (PV) module system is an emerging type of structure that has garnered significant attention in recent years due to its large span, strong terrain adaptability, and economic advantages. As it is a flexible structure supported by cables, wind-induced vibrations can lead to structural instability or even component damage, posing a serious threat to the safety of PV power plants. Determining the wind-induced vibration characteristics of the DL cable-supported PV module system is the foundation for ensuring its structural safety. In this study, based on wind tunnel tests performed on an aeroelastic model, a typical DL cable-supported PV module system used in a real engineering project was examined. The wind-induced displacement and torsional vibration characteristics of the model were compared and analyzed under different wind speeds. The shading effects of the PV array were also studied, and the impact of different wind angles and the initial tilt angles of PV modules on the wind-induced vibration characteristics was revealed. The results show that the greatest displacement vibration response occurs in the vertical direction; in comparison, displacements in other directions are smaller. Wind-induced torsional vibrations are negligible and can be ignored compared to displacement vibrations. The wind-induced vibration of the first row in the cable-supported PV array is significantly greater than that of the subsequent rows, and the shading effect is obvious. In the same row, the displacement vibration of modules at the center span is greater than at the sides. Different wind angles and initial PV module tilt angles affect the wind-induced vibration characteristics. When the wind direction is perpendicular to the cables and wind suction occurs, the wind-induced vibration is maximal. Within a limited range, the larger the initial tilt angle of the PV module, the greater the wind-induced vibration.

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