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Study on the Influence Factors of Photovoltaic Performance

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Tutor: TianRui
School: Inner Mongolia University of Technology
Course: Thermal Power Engineering
Keywords: Photovoltaic,PVmodule,I-Vcharacteristics,P-Vcharacteristics
CLC: TM615
Type: Master's thesis
Year:  2013
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Application of fossil energy is the basis of the rapid development of human materialcivilization. The limited reserves of fossil fuels increasingly dried up, and the resultinggrowing environmental pollution, have made people pay more attention to the presentsituation and the development of the energy. The new alternative energy and clean energydevelopment and large-scale application is imminent. Solar energy with wide distribution,huge reserves, without transport advantages to become an important part of new energy.Photovoltaic(PV) energy conversion process simpler, will the sun radiant energy intoelectrical energy directly, and developed rapidly in recent years.In this paper, the specific work in Inner Mongolia industrial university key laboratory forwind and solar energy province department of project, and is aimed at influencing factorsof solar photovoltaic power generation the corresponding theory and experimental study,and simulation calculation.This paper studies the performance of the PV modules under the partially shadedconditions.10%shading of the PV module can result in80%or even higher power losses,20%or more shading, the output power of the PV module is almost zero. Shaded by thesame area of the shadow, the characteristics of the PV modules under centralized shadingis much worse than scattered shading, and the more dispersed the less attenuation. Thecharacteristics curves trend is normal under uniform shading on substring groups, thecurrent imbalance between substring groups under non-uniform shading, and the modulesappear staircase I-V curves and multi-peak P-V curves. The shading ratio on the shadedcells is the greater the Pmof the module is smaller, the greater power loss.This paper studies the performance of the PV modules with dust deposition on the surface.Test the light transmittance of the glass sample which is dust accumulated, the longer dustaccumulation, the more attenuation of the light transmittance. The obvious attenuationspectrum is the range of350~2750nm,30days¡¯ dust accumulation on the surface of theglass caused transmittance attenuation by21.8%averagely, and40days attenuation by45.5%averagely. The more dust accumulated on the surface of the PV modules, the morethe power loss, the amount of dust is5.65g/m2, the power loss up to15.2%. This paper studies the impact on the efficiency of the PV modules with differentinstallation angles and the adjustment ways. Experiments shows that the PV arrays shouldbe installed by4¡ã,18¡ã,36¡ãas the best angle in July¡¢August and September, in Hohhotregion. The RETScreen almost perfectly match the corresponding angles. By theRETScreen analysis simulation, the installation angle of PV arrays should be adjusted halfa year in Hohhot region. It¡¯s16¡ãfrom April to September, and59¡ãfrom October to Marchthe following year. The way improves the efficiency of lighting, and doesn¡¯t increase muchcost of installation and maintenance and operation.
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