Methods to determine the dc parameters of solar cells: A critical review

Cotfas, Daniel T.; Cotfas, Petru A.; Kaplanis, Socrates

doi:10.1016/j.rser.2013.08.017

Cited by 171 publications

(105 citation statements)

References 49 publications

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“…Each element included in the equivalent circuit implies one parameter that has to be determined (two in the case of the diode whose behavior is represented by the Shockley equation [20]). Therefore, five parameters need to be calculated when using this method [21][22][23][24][25][26][27][28][29][30][31][32][33]. The current-voltage curve of a solar cell or panel, hereinafter the I-V curve (see Figure 2), is quite well reproduced by this simple equivalent circuit.…”

Section: Methodsmentioning

confidence: 99%

Explicit Expressions for Solar Panel Equivalent Circuit Parameters Based on Analytical Formulation and the Lambert W-Function

Cubas

Pindado

Manuel

2014

Proceedings of 1st International E-Conference on Energies

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Due to the high dependence of photovoltaic energy efficiency on environmental conditions (temperature, irradiation...), it is quite important to perform some analysis focusing on the characteristics of photovoltaic devices in order to optimize energy production, even for small-scale users. The use of equivalent circuits is the preferred option to analyze solar cells/panels performance. However, the aforementioned small-scale users rarely have the equipment or expertise to perform large testing/calculation campaigns, the only information available for them being the manufacturer datasheet. The solution to this problem is the development of new and simple methods to define equivalent circuits able to reproduce the behavior of the panel for any working condition, from a very small amount of information. In the present work a direct and completely explicit method to extract solar cell parameters from the manufacturer datasheet is presented and tested. This method is based on analytical formulation which includes the use of the Lambert W-function to turn the series resistor equation explicit. The presented method is used to analyze commercial solar panel performance (i.e., the current-voltage-I-V-curve) at different levels OPEN ACCESSEnergies 2014, 7 4099 of irradiation and temperature. The analysis performed is based only on the information included in the manufacturer's datasheet.

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Section: Methodsmentioning

confidence: 99%

Explicit Expressions for Solar Panel Equivalent Circuit Parameters Based on Analytical Formulation and the Lambert W-Function

Cubas

Pindado

Manuel

2014

Proceedings of 1st International E-Conference on Energies

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“…From these results, it was showed that sometimes, these exact methods could obtain parameter estimations with low fitting error but lacking physical meaning due to negative resistances and higher ideality factors, as it has been reported in literature [13]. However, by combining the GA with Nelder-Mead method, it was possible to explore global solutions and minimize the error between the data and model, being these errors lower than those published in the literature [2,13]. Becoming this procedure in a powerful tool to fully estimate the parameters that are related to one-diode model, avoiding issues, such as initial condition and physical or mathematical assumptions to simplify the optimization process.…”

Section: Discussionmentioning

confidence: 63%

“…This model showed the relationship between the current (I) and voltage (V) of solar device, the five parameters (photo-generated current, diode saturation current, ideality factor, shunt, and series resistances) and thermal voltage (V T ) that depends on the temperature, the Boltzmann constant (k), and electron charge (q), Equation (2).…”

Section: Numerical Methods Used To Extract the One-diode Parametersmentioning

confidence: 99%

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Numerical Analysis to Determine Reliable One-Diode Model Parameters for Perovskite Solar Cells

et al. 2018

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Abstract:With the aim to determine the photo-generated current, diode saturation current, ideality factor, shunt, and series resistances related to the one-diode model for p-i-n planar perovskite solar cells, reference cells with active area of approximately 1 cm 2 and efficiencies ranging between 4.6 and 12.2% were fabricated and characterized at standard test conditions. To estimated feasible parameters, the mean square error between the I-V curve data of these cells and the circuital model results were minimized using a Genetic Algorithm combined with the Nelder-Mead method. When considering the optimization process solutions, a numerical sensitivity analysis of the error as a function of the estimated parameters was carried out. Based on the errors behavior that is showed graphically through maps, it was demonstrated that the set of parameters estimated for each cell were reliable, meaningful, and realistic, and being related to errors lower than 9.1 × 10 −9 . Therefore, these results can be considered as global solutions of the optimization process. Moreover, based on the lower errors obtained from the optimization process, it was possible to affirm that the one-diode model is suitable to model the I-V curve of perovskite solar cells. Finally, the estimated parameters suggested that the average ideality factor is close to 2 when the fill factor of the I-V curves is higher than 0.5. Lower fill factors corresponded to ideality that was higher than 3, linked to lower efficiencies, and high loses effects reflected on lower shunt resistances. Lower ideality factor of 1.4 corresponds to the best performing solar cells.

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“…Different procedures were developed in time for extracting the onediode model parameters (I L , I S , m, R S and R P ). A comprehensive review on 34 different procedures developed for extracting the one-diode model parameters is reported in [5]. In this paper a procedure for extracting the I-V characteristics within the frame of the one diode model at STC is discussed.…”

Section: Introductionmentioning

confidence: 99%