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A Simplified Simulation Procedure and Analysis of a Photovoltaic Solar System Using a Single Diode Model

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Document pages: 33 pages

Abstract: Asingle diode model for a photovoltaic solar module is the most ideal and quickway of analyzing the module characteristics before implementing them in a solarplant. Solar modules manufacturers provide information for three criticalpoints that are essential in I-V, P-V or P-I curves. In this study, we proposefour separate simulation procedures to estimate the five-model parameters of ananalogous single diode equivalent circuit by utilizing three cardinal points ofthe photovoltaic module I-V curve, described from experimental data using asolar simulator and manufacturer’s datasheet. The main objective is to extractand use the five unknown parameters of a single diode model to describe thephotovoltaic system using I-V ad P-V plots under different environmentalconditions. The most influential parameters that greatly alter the cardinalpoints defined at short circuit point (SCP), the maximum power point (MPP) andthe open circuit point(OCP) are the ideality factor (n) and the diode saturation current (Io). For a quick and fast convergence, wehave determined the optimal ideality factor (no) and optimal saturation current (Ioopt) as theprimary parameters by first assuming the optimal values of Rsh, Rs and Iph atstandard test conditions (STC). Further, we evaluated the effects of Iph, Rs and Rsh on I-V andP-V curves by considering the values of n below no. We haveevaluated different iterative procedures of determining Rsh and Rs at open-circuit, short-circuit point and the maximum-power points. Theseprocedures have been classified into four approaches that guarantees positiveshunt and series resistance for n ≤ no. Theseapproaches have been categorized by deriving the saturation current as adependent variable at each cardinal point with or without Rs and Rsh pair. The values obtained for the five parameters have been used tosimulate the photovoltaic solar module characteristic curves with greatprecision at different air temperatures and irradiances, considering the effectof Nominal Operating Cell Temperature (NOCT).

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