Abstract
In this research, a methodology is proposed to extract temperature coefficient of open circuit voltage and intensity dependence of short circuit current of PV cells. A holistic combination of experiments and diode models of photovoltaic cells was used. The effects of light intensity and cell temperature on the performance of different solar cell technologies were investigated. Three main photovoltaic cell technologies were investigated, namely monocrystalline, polycrystalline and thin-film. The monocrystalline and polycrystalline technologies were modeled using the one-diode model whereas the thin-film technology was modeled using the two-diode model. The mean absolute bias error was close to zero for the models, which confirmed their reliability. It was observed that light intensity highly affected the current parameters while having little effect on the voltage parameters. It was also noted that cell temperature affected the voltage parameters while having minimal effect on the current parameters. The study revealed that wafer based technology exhibited higher response to irradiance and lower temperature coefficient than thin film technology. Irrespective of cell technology, temperature coefficient is linearly dependent on intensity of light.
Highlights
The photovoltaics sector has seen huge improvements during the last decade, with the addition of at least 98 GWp in 2017 which is equivalent to total global installed capacity in 2012 to reach 402 GW [1]
It was observed that light intensity highly affected the current parameters while having little effect on the voltage parameters
The monocrystalline and polycrystalline technologies were modelled using the one-diode model whereas the multi junction thin-film technology was modelled using the Two-Diode Model developed in C-Language using Dev C++
Summary
The photovoltaics sector has seen huge improvements during the last decade, with the addition of at least 98 GWp in 2017 which is equivalent to total global installed capacity in 2012 to reach 402 GW [1]. Khan et al [7] investigated the effect of light intensity on solar cell parameters such as parallel resistance (Rpa , series resistance (Rse), diode ideality factor and reverse saturation current (Io) They observed that an increase in intensity resulted in a decrease in Rse, and Io whereas Rpa initially increased and became nearly constant. Chegaar et al [8] experimentally investigated the effect of light intensity on different solar cell parameters for polycrystalline solar cells with all measurement done at room temperature They observed that the short-circuit current, the photocurrent and the ideality factor increased linearly with the light intensity whereas the open-circuit voltage and efficiency of the cell increased logarithmically.
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