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Solar cell parameter extracting method based on Lambert W function and polynomial fitting

A polynomial fitting and solar cell technology, which is applied in the field of solar cell parameter extraction based on Lambert W function and polynomial fitting, can solve the problem that the parameters cannot be obtained analytically, and achieve the effect of high precision and simple method.

Inactive Publication Date: 2014-03-12
NANCHANG HANGKONG UNIVERSITY
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Problems solved by technology

[0002] Solar cell parameters include photogenerated current, reverse saturation current, ideality factor, parallel resistance and series resistance. Solar cell parameter extraction technology has been widely studied in the field of photovoltaics, because these parameters are an important basis for measuring the quality of solar cells; but include the above The solar cell current output equation of parameters is a transcendental equation, and the parameters cannot be calculated analytically

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  • Solar cell parameter extracting method based on Lambert W function and polynomial fitting
  • Solar cell parameter extracting method based on Lambert W function and polynomial fitting

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Embodiment Construction

[0029] The invention is a method for extracting battery parameters only relying on a single volt-ampere characteristic curve of a solar battery under illumination.

[0030] As an example, we use this method to propose five electrical parameters such as the photogenerated current of single and module solar cells. Test and fit results such as figure 1 , figure 2 As shown; the specific operation is to measure the volt-ampere characteristic curve of the solar cell by using the usual method of applying a voltage to measure the current; then, the solar cell parameters are extracted by using the content of the present invention; Safety characteristic curve.

[0031] From Figure 1-2 From the measurement and fitting results, it can be seen that the fit is very good. For a single solar cell, the extracted photogenerated current is 0.7637 amperes, and the reverse saturation current is Amperes, the ideality factor is 1.5736, the parallel resistance is 73.3281 ohms, and the series r...

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Abstract

The invention relates to a solar parameter extracting method based on a Lambert W function and polynomial fitting. The method includes: using the Lambert W function to perform manifestation and integration on a solar cell current output transcendental equation to obtain a manifestation integral equation; separating a solar cell current voltage output curve into three sections for fitting to obtain a sectional function; performing integration on the sectional function to obtain a sectional integral equation; selecting the measurement value on the solar cell volt-ampere characteristic curve to build an equation set of the sectional integral equation and the manifestation integral equation so as to solve the five electric parameters of solar cell photo-generated current, reverse saturation current, ideal factors, parallel resistance and serial resistance. The method has the advantages that by the solar cell volt-ampere characteristic curve under light, the five electric parameters such as the solar cell photo-generated current can be extracted simply and precisely.

Description

technical field [0001] The invention relates to a solar cell parameter extraction method, in particular to a solar cell parameter extraction method based on Lambert W function and polynomial fitting. Background technique [0002] Solar cell parameters include photogenerated current, reverse saturation current, ideality factor, parallel resistance and series resistance. Solar cell parameter extraction technology has been widely studied in the field of photovoltaics, because these parameters are an important basis for measuring the quality of solar cells; but include the above The current output equation of the solar cell with parameters is a transcendental equation, and each parameter cannot be obtained analytically. In order to solve this problem, various solar cell parameter extraction methods have been proposed [(Xiao Wenbo et al., Optoelectronics#Laser, 2012.23(9):1681), (L L Peng, et aL, Journal of Power Sources, 2013, 227(1) : 131)], the goal of all methods is to extra...

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Application Information

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IPC IPC(8): H02S50/10
CPCY02E10/50
Inventor 肖文波胡方雨刘萌萌
Owner NANCHANG HANGKONG UNIVERSITY
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