Classification of Flexible Photovoltaic Support Systems

Flexible support systems are categorized into single-layer cable structures, double-layer cable truss structures, bowstring cable truss structures, and beam-string structures.

(1) Single-Layer Cable Structure
A single-layer cable structure typically consists of main steel frames composed of beams and columns, diagonal bracings, and cable bodies as the primary components. The cable body comprises two parallel tension cables aligned with the plane of the photovoltaic modules, replacing conventional tension members. After the installation of the module support cables, they are anchored using fixtures at the ends of the steel beams. Tensioning equipment is used to apply stress stiffness to the support cables, which bear the modules. The system forms a self-balancing mechanism through the diagonal bracings at the ends.

(2) Double-Layer Cable Truss Structure
A double-layer cable truss structure consists of main steel frames composed of beams and columns, diagonal bracings, cable bodies, and rigid struts between the cables. The cable body includes two parallel upper cables and one upward-curved lower cable. Compared to the single-layer cable structure, this design incorporates additional load-bearing cables and rigid struts. The system achieves stress stiffness through the tensioning of the cables, forming a self-balancing mechanism.

(3) Bowstring Cable Truss Structure
The bowstring cable support system includes diagonal supports, columns, beams, struts, module support cables, and cross-fixing cables. It features a simple and aesthetically pleasing structure, with limited fixed positions for the columns and diagonal supports. This design requires fewer support points, occupies less ground area, reduces earthwork, and lowers construction costs.

(4) Beam-String Structure
A beam-string structure consists of main steel frames composed of beams and columns, diagonal bracings, rigid upper chords, cable bodies, and rigid struts. The cable body serves as the load-bearing cable, and unlike the triple-layer cable truss, it does not include stabilizing cables. The upper chord employs a rigid structure, while the lower chord uses flexible tension cables. Under prestress, the struts provide elastic support to the upper chord, improving the load-bearing performance of the upper structure and forming a self-balancing system.