Analysis of each branch current of serial solar cells by using an equivalent circuit model |
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Authors: | Yi Shi-Guang Zhang Wan-Hui Ai Bin Song Jing-Wei Shen Hui |
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Affiliation: | a Institute for Solar Energy Systems, State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics and Engineering, Sun Yat-Sen University, Guangzhou 510275, China;b Guangdong Testing Institute of Product Quality Supervision, Foshan 528300, China |
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Abstract: | In this paper, based on the equivalent single diode circuit model of the solar cell, an equivalent circuit diagram for two serial solar cells is drawn. Its equations of current and voltage are derived from Kirchhoff’s current and voltage law. First, parameters are obtained from the I–V (current–voltage) curves for typical monocrystalline silicon solar cells (125 mm×125 mm). Then, by regarding photo-generated current, shunt resistance, serial resistance of the first solar cell, and resistance load as the variables. The properties of shunt currents (Ish1 and Ish2), diode currents (ID1 and ID2), and load current (IL) for the whole two serial solar cells are numerically analyzed in these four cases for the first time, and the corresponding physical explanations are made. We find that these parameters have different influences on the internal currents of solar cells. Our results will provide a reference for developing higher efficiency solar cell module and contribute to the better understanding of the reason of efficiency loss of solar cell module. |
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Keywords: | solar cell equivalent circuit current property |
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