Basic Mechanical Properties And Electrical Properties Research Of Amorphous Silicon Thin Film Photovoltaic Module

With the widely application of photovoltaic modules, photovoltaic module in the actual application process can withstand wind load, snow load, earthquake load and so on, the strength and stiffness of the PV modules are put forward higher requirements. So the research on the mechanical properties of PV modules and the electrical properties variation of the PV module under load is particularly important.In this paper, through theoretical analysis, proposed the amorphous silicon thin film photovoltaic simplified mechanical model.The basic mechanics of EVA plastic and amorphous silicon thin-film batteries in PV modules were tested, and obtained their elastic modulus, yield strength, ultimate strength. It provides mechanical parameters for the calculation in PV modules parametric numerical analysis and a reference for the selection of PV module manufacturers.For the study on the mechanical and electrical properties of PV modules,designed an experimental program,the JX-1and DX-2 specimens respectively were level pressure.And analyzed specimen of failure characteristics, carrying capacity, electrical properties. The results show that: ① The type of amorphous silicon thin-film PV modules ultimate strain, ultimate stress, ultimate load. ②Initial loading, the component of output voltage drops slowly, when glass was damaged,output voltage will decay rapidly. Structural strength and the output voltage of the components together determine control stress PV. In order to ensure safe use component architecture and components normal output voltage control stress should be around 47.71 MPa, promising load is 8.46 KPa. ③Component meet the requirements of mechanical load test specified in existing codes.Using ANSYS software to build a computational model,verified the correctness of the simplified mechanical model, and and discussed the impact of the mechanical properties of glass thickness, EVA rubber thickness, the aspect ratio of the components. The results show that: ① The thickness of the glass substrate and the cover glass thickness ratio is greater than 1,which is more conducive to the photovoltaic component carrying capacity. but the glasssubstrate than the cover glass is high cost, when photovoltaic component bearing capacity is no special requirements, can make the thickness of the glass substrate and cover glass thickness ratio is less than 1. ② EVA glue thickness should be less than 0.64. ③ In the case of simply supported on four sides, the ratio of length and width in the 1:1, the component of each layer material of stress is the smallest. But in practical engineering, in order to facilitate the construction and appearance, the length and width of the custom component is larger than 1. To ensure the bearing capacity and convenient construction of components in practical engineering application, proposed component ratio of length and width in 1:1~2:1.