Concentrated Photovoltaic Thesis

Concentrated Photovoltaic Thesis-28
During the outdoor experimentation, in direct exposure to the sun, measurement conditions are monitored with controls similar to those made in laboratory.

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An experimentation on two multijunction photovoltaic cells is performed for their application in a cogeneration system for solar energy exploitation.

This system includes a linear parabolic concentrator, which focuses the light over row of PV cells, located on a side of a tube with rectangular section.

The research investigates electrical power extracted, efficiency, temperatures reached, and possible damages of the photovoltaic cell.

To exploit the recent improvements in the development of photovoltaic (PV) cells and new materials for solar applications, it is important to test them both in laboratory and with direct exposure to the sun.The measurements parameters for the outdoor tests are then chosen on the basis of these simulations of the cogeneration system in order to reproduce the actual operative conditions.A preliminary characterization of the cells is carried out in laboratory, in a controllable and reproducible situation, to serve as reference for the field measurements.When the cells to be tested are of concentration type, these devices must provide an adequate amount of light, even hundreds of times greater than the natural one.The technology used in these devices employs very powerful lamps appropriately filtered to reproduce the solar spectrum and optical systems capable of concentrating this light on a target of few squared centimeters [3, 15, 16].The system is optically designed using ray-tracing simulations carried out with the calculation program Zemax-EE by Radiant Zemax.The working conditions of the photocell (solar concentration, incident power density, focused light distribution, image dimension, etc.) are estimated by simulating the concentered light distribution in the image plane.We use cookies to make interactions with our website easy and meaningful, to better understand the use of our services, and to tailor advertising.For further information, including about cookie settings, please read our Cookie Policy .Alternatively, for concentrated photovoltaics, pulsed systems can be employed: they reach considerable powers but only for short time intervals [17–19].The test methodology proposed in this paper uses solar light instead of a lamp and a Fresnel lens to concentrate light on the PV cell.

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