Method for extracting solar battery parameters

Abstract

The invention provides an algorithm for extracting solar cell parameters. The method is characterized by comprising the steps of 1) obtaining a current-voltage characteristic equation of an ideal single-diode solar battery equivalent circuit according to the Kirchhoff's current law, and establishing a solar battery single-diode model; 2) using J-V curves in the single-diode model to obtain parameters (open circuit voltage Voc, a short circuit Jsc, shunt resistance Rsh and moc) to extract unknown parameters (an ideal factor n, reverse saturation current J0 andseries resistance Rs); 3) drawing corresponding curves corresponding to measurement values Jsc, Voc, and moc of a solar battery under different penetrating illumination to determine the values of unknown parameters Rs, n, and J0.

Description

technical field [0001] The invention belongs to the field of solar parameter calculation, in particular to a method for extracting solar battery parameters. Background technique [0002] Due to the increasingly serious environmental pollution and the depletion of fossil fuels, the research on renewable energy has become the focus of attention of all countries. Solar energy has become an internationally recognized rational alternative energy due to its advantages of abundant resources, cleanliness and pollution-free. The core of the photovoltaic power generation system has become a research hotspot for 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 and the evaluation of battery systems. [0003] The mainstream parameter extraction method based on the solar cell current curve generally includes a heuristic...

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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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