EFFECTS OF MODULE TILT ANGLE ON AERODYNAMIC STABILITY OF SINGLE-AXIS PV TRACKER BRACKET

Wen Qing; Xu Hui; Wu Qian; Zuo Taihui; Hua Xugang

doi:10.19912/j.0254-0096.tynxb.2024-2095

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Acta Energiae Solaris Sinica ›› 2026, Vol. 47 ›› Issue (4) : 614-621. DOI: 10.19912/j.0254-0096.tynxb.2024-2095

EFFECTS OF MODULE TILT ANGLE ON AERODYNAMIC STABILITY OF SINGLE-AXIS PV TRACKER BRACKET

Wen Qing¹, Xu Hui¹, Wu Qian², Zuo Taihui³, Hua Xugang²

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Abstract

Aiming at the problem of aerodynamic instability of PV tracker bracket under strong wind, a wind tunnel test system for large amplitude pure torsional vibration section model was developed. The wind tunnel test of the aerodynamic stability of the PV tracker bracket section model in the range of -60°-60° module tilt angle was carried out, and the influence of module tilt angles on windinduced vibration of tracker bracket was obtained. The results show that the aerodynamic stability of the PV tracker bracket is closely related to the tilt angle of the module. In the uniform flow field , when the structural damping ratio is about 3.9% and the installation tilt angle of the module is in the range of -39°-40°, the bracket will undergo aerodynamic instability. The dimensionless critical wind speed （U_r=U/fB） is between 3.1-5.3, and the relationship curve between the critical wind speed of aerodynamic instability and the tilt angle of the module is W-shaped. Under the action of static wind load, the module will produce static wind torsional displacement. Considering the influence of static wind torsional displacement, the actual tilt angle of the module during the aerodynamic instability of the bracket is -43°-46°. After the occurrence of aerodynamic instability, the equilibrium point of the torsional vibration of the bracket is the actual tilt angle of the module under the action of static wind load. The torsional amplitude increases rapidly with the increase of wind speed, and the maximum torsional amplitude can reach 90°, which reproduces the large-scale aerodynamic instability of the real flat single-axis tracker bracket in practical engineering.

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PV modules / PV tracker bracket / wind tunnel test / aerodynamic stability / module tilt angle / critical wind speed / section model

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Wen Qing, Xu Hui, Wu Qian, Zuo Taihui, Hua Xugang. EFFECTS OF MODULE TILT ANGLE ON AERODYNAMIC STABILITY OF SINGLE-AXIS PV TRACKER BRACKET[J]. Acta Energiae Solaris Sinica. 2026, 47(4): 614-621 https://doi.org/10.19912/j.0254-0096.tynxb.2024-2095

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