Abstract
The output characteristics of a PV array vary nonlinearly when the number of solar cells interconnected in series and parallel changes. The model and its parameters for a single solar cell are analyzed firstly. Then the models and there parameters for series, parallel circuits and series-parallel PV array are proposed respectively using circuit theory and observational method. Especial, the parameters of the equivalent circuits for PV arrays are characterized by a equation. A simulations are implemented to verify the three types of theoretical models and there parameters.Keywords: Solar cell; Model; PV array; I-V curve; Equivalent circuit
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