Fatigue And Damage Of Crystalline Cell In Photovoltaic

In recent years, photovoltaic(PV) technology is widely used, mainly for applications in the form of the ground station or being attached to the outside of the building, which material is in common made of electricity crystalline silicon,and the core of PV modules is crystalline silicon solar cells. PV modules in areas with high wind loads produced large deflection and caused EVA film shear deformation,which resulting the stress in crystalline silicon cells, and then causing the cells cracked problem, even resulting fragmentation with beyond the ultimate strength of such components. Since the stress of the internal components is not easily measured and the analyzed result can not be used simply through the way of trial results, especially in the process of cyclic loading, the stress and damage evolution can not rely on the development of test monitoring well. This paper based on the elastic theory is desired to analyzed the stress of PV module cells and use damage mechanics to presented damage constitutive relations and damage evolution equation, and use numerical simulation by ANSYS finite element analysis software to obtained the theoretical data and inversion test parameters.The paper completed as follow:(1) Present an overview of solar PV systems, lead to the cracked problem of solar cells, read and organized the current situation of previous research works,fatigue analysis methods and the development of fatigue damage theory which related to PV modules under mechanical load.(2) Analyze the stress of PV cell under wind load, bulid the stress analysis theoretical model, and use finite element analysis to compare the finite element data against elasticity solution, verified the validity of the calculation method. And to study the various materials, correlated variables and the stress variation law of PV cell inside the laminated board model. Explore the measures to reduce stress and ensure the battery slice high-efficiency.(3) From the basic principles of continuum damage mechanics theory, according to the achievement researches, the paper organized and discussed damage variables without considering the anisotropy. The conclusion of damage constitutive relations and damage evolution is given.(4) For the damage development of crystalline silicon solar cells,the paper is based on the basic theory of thermodynamics and mechanical damage, analyzed and calculated damage evolution under cyclic wind loads in the assembly cells and answer with the theoretical and experimental results were compared.