Valuation and Determination of Seven and Five Parameters of Photovoltaic Generator by Iterative Method

Abstract

The mathematical modeling of solar cells is essential for any optimization operation of the efficiency or the diagnostics of the photovoltaic generator. The photovoltaic module is generally represented by an equivalent circuit whose parameters are experimentally calculated by using the characteristic current-tension, I-V. The precise determination of these parameters stays a challenge for the researchers, what led to a big diversification in the models and the digital methods dedicated to their characterizations. In the present paper; we are interested in the parametric characterization of a model in both following cases: with single and two diodes, in order to plan the behavior of the photovoltaic generator under real functioning conditions. We developed an identification method of the parameters using Newton Raphson's method by using the software Matlab/Simulink. This method is a fast technique which allows the identification of several parameters and can be used in real time applications. The results of the proposed method show a high agreement between the experimental and simulated characteristics photovoltaic generator.

A new approach for parameter estimation of the single-diode model for photovoltaic cells/modules

“…In their study, the differences between the models were analyzed in terms of accuracy and execution time, and it has been concluded that the two-diode model has better accuracy, but it also has a longer execution time. Similarly, in another study [12], the authors solved both models using a numerical solution on a PV module simulated in a hybrid system. In addition, the authors stated that the single-diode model has fewer parameters so that the unknowns can be calculated in a shorter time, and that the two-diode model is more consistent in terms of accuracy.…”

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

“…Other approaches, 3 and 4 give reasonable results when applied in Equations ((27), (28), (29) and (36)). Evidently, Equations ( 27and (29)) that have been derived at maximum power point and combination of maximum power point and short circuit equations, respectively, give the best results of ∆P mpp error for all saturation current equations at constant ideality factor.…”

“…This category gives satisfactory Again, the data shown in Table 3 & Table 4 in rows 9 -12, represent category 3 where I o is determined using Equation (17). This category gives satisfactory [R s , R sh ] pair only from Equations ((27), (28), (29) and (36)).…”

“…Finally, rows 13 -16 of Table 3 & Table 4 give category 4 data for Solinc 120 W and KC200GT, where I o is determined using Equation 18that is independent of R s , R sh pair. This category also gives satisfactory [R s , R sh ] pair only from Equations ((27), (28), (29) and (36)).…”

“…The analytical approach relies heavily on the availability of data for short-circuit current (I sc ), maximum power point voltage (V mpp ), maximum power point current (I mpp ), open-circuit voltage (V oc ) and IV-curve intersection slopes [21] [22] [23]. Several authors have used information provided from the manufacturer's datasheets for I sc , V oc , I mpp , V mpp to determine the photovoltaic parameters using nonlinear least square (NLS) algorithm [24], normalized root mean-square deviation (NRMSD) [25] [26], Newton-Raphson algorithm [27] [28] and Lambert W Function [29] [30] [31] [32] [33]. These approaches offer quick, robust and faster ways of extracting the parameters of a single-diode photovoltaic model.…”