Effect of varying concentration and temperature on steady and dynamic parameters of low concentration photovoltaic energy system |
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Affiliation: | 1. Jiangsu Provincial Key Laboratory of Materials Cycling & Pollution Control, School of Energy and Mechanical Engineering, Nanjing Normal University, 210042 Nanjing, China;2. Engineering Laboratory of Energy System Process Conversion, Emission Reduction Technology of Jiangsu Province, 210042 Nanjing, China |
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Abstract: | Low-concentration photovoltaic (LCPV) system has huge potential for further cost reduction of solar photovoltaic (PV) power as compared to flat panel PV. The dependence of steady state and dynamic parameters on concentration and temperature is crucial to extract maximum power from solar photovoltaic system. This article aims to present the effect of varying concentration and temperature on steady state and dynamic parameters of LCPV system under actual test conditions (ATC). The rate of change in ISC with solar irradiation i.e., dISC/dG is found as 0.25 A/W assuming ≈±1 °C change in module temperature. The effect of temperature on inherent material properties responsible for photo-conversion efficiency is studied using impedance spectroscopy technique. A linear response of series resistance of LCPV module is observed with respect to change in module temperature, i.e. dRS/dT from 297 to 333 K is in the range of 1.15–1.20 Ω with a rate of 1 mΩ/K. From real-time analysis of LCPV system open-circuit voltage found decreasing from 21 to 20.6 V with temperature coefficient of voltage ≈−0.061 V/K. The dynamic resistance has a positive coefficient of module temperature i.e., drd/dT given by 0.49 Ω/K. |
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Keywords: | Low-concentration photovoltaic (LCPV) system Concentration photovoltaic (CPV) Dynamic resistance Silicon solar PV module |
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