Abstract
This paper analyzed a kind of two-diode model and reasonably simplified the mathematical calculation process under different irradiance, proposing a method which can use maximum power point to calculate simultaneously series and parallel resistance. Two kinds of PV modules should be tested in order to validating the accuracy of the proposed method. It is calculated that the relative error of single diode model is 1.72% and the two-diode model is 0.45%. The result shows that more accuracy can be performed for two-diode model in reflecting the output characteristics of photovoltaic cells.
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