A method for extracting solar cell parameters

Abstract

The invention provides an algorithm for extracting solar battery parameters. Its basic feature is that it includes the following steps: 1) Obtain the current-voltage characteristic equation of the equivalent circuit of an ideal single-diode solar cell according to Kirchhoff's current law, and establish a solar cell single-diode model; 2) Utilize J~ V curve obtains parameters (open circuit voltage V oc , short circuit J sc , parallel resistance R sh and m oc ) to extract unknown parameters (ideality factor n, reverse saturation current J 0 , series resistance R s ); 3) By measuring the J of the solar cell under different transmitted light sc , V oc and m oc The measured values ​​are plotted against the corresponding curve to determine the unknown parameter R s , n and J 0 value.

Description

technical field [0001] The invention belongs to the field of solar parameter calculation, in particular to a method for extracting solar cell parameters. Background technique [0002] Due to the increasingly serious environmental pollution and the increasing depletion of fossil fuels, the research on renewable energy has become the focus of attention of various countries. Solar energy has become an internationally recognized rational alternative energy source due to its abundant resources, clean and pollution-free advantages. The core of photovoltaic power generation system has become a research hotspot of scholars at home and abroad. Photovoltaic cells are the core of photovoltaic power generation systems. A suitable photovoltaic cell model is of great significance for the design and manufacture of photovoltaic testers, as well as for the evaluation of battery systems. [0003] The mainstream parameter extraction methods based on solar cell current curve generally includ...

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Problems solved by technology

The former algorithm has high precision, but the calculation time is extremely long, and it is easy to cause non-convergence; the latter algorithm generally assumes that the parallel resistance Rsh is infinite to simplify the analysis

But in fact, the role of parallel resistance cannot be ignored, which will lead to the extracted series resistance Rs, ideality factor n and saturation current density J 0 Therefore, this paper proposes a parameter extraction method to enable solar cells to accurately extract series and parallel resistance, ideality factor and saturation current density from current curves under different light intensities through numerical and curve fitting techniques. Instead of assuming infinite parallel resistance

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