A new method for accurate estimation of PV module parameters and extraction of maximum power point under varying environmental conditions

Abstract

Abstract:The objective of this paper is to estimate the values of five parameters ( A , Rse , R sh , ILG , and Isat) of a PV module more accurately and to extract the maximum power point (MPP) accurately under varying environmental conditions. Suitable new equations are proposed, by which the values of the series and shunt resistances are initialized in order to obtain good convergence speed in the Gauss-Seidel method. In this work, two new equations are proposed to find the ideality factor and shunt resistance and to obtain accurate MPP of the PV model under varying environmental conditions. The proposed PV model is validated at standard test conditions and under varying environmental conditions. Current-voltage and power-voltage characteristics of different PV modules are simulated using MATLAB. Accuracy of the proposed model is validated by comparing with the results of an adaptive neuro-fuzzy inference system and experimental data taken under varying environmental conditions.

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

“…(20) and 4, respectively. As shown in the table, the values of the parameters for PV module are in close agreement with the solutions given in [1] and those determined by the models proposed in [4,[6][7][8]26]. It is clear that the proposed model allows getting more realistic results without any prior knowledge except technical data.…”

“…This is because the value of parallel resistor ( R p ) has been assumed to be in the range of 6.3 − 7.7 kΩ in the study conducted in [7]. However, the proposed model and the ones given in [4,[6][7][8]26] indicate that this value is around 2.5 kΩ . In Table 8, the results identified for BP SX-150 PV module are presented with those given in [24].…”

“…Ref. [1] The proposed model Model in [1] Model in [4] Model in [6] Model in [7] Model in [8] Model [26] R Table 4. One can see that the results obtained by the proposed model and the metaheuristic methods slightly differ.…”

“…Additionally, the result obtained by using the equation given in [1] is unrealistic. The proposed model Model in [1] Model in [4] Model in [6] Model in [7] Model in [8] Model in [26] R In this section, as an example for the application of the proposed model, the equivalent circuit parameters of four commercial PV modules; MSX60, KC200GT, SW255, and BP SX-150 were extracted at standard test conditions, i.e. air temperature of 25 • C and solar radiation of 1000 W /m 2 .…”

“…The set of equations was solved using the Newton-Raphson method, and it was demonstrated that the extraction of the five unknown parameters can easily be determined by this method. A new set of equations for the determination of the equivalent circuit parameters based on Kirchhoff's laws at STC was proposed in [6], and the validity of the model was evaluated on some commercial PV modules using the Gauss-Seidel method. In this study, the initial values of the unknown parameters were also determined by using approximate analytical models since the performance of the Gauss method is significantly affected by the initial conditions.…”