Method for utilizing mathematic dominant model to solve solar cell physical parameters

Abstract

The invention discloses a method for utilizing a mathematic dominant model to solve solar cell physical parameters. Through experiment data, two mathematic model parameters of open-circuit voltage and short-circuit voltage of a photovoltaic panel are directly read, then through a numerical fitting method, two another parameters are solved, therefore the mathematic model is obtained, through the mathematic model parameters, a maximum power point and a current voltage slope are solved, through the parameters, an equation set related to physical parameters is obtained, and five physical parameters are solved. The method for utilizing the mathematic dominant model to solve the solar cell physical parameters has the advantages that the problem is solved that in the physical parameter solving process, the maximum power point and the current voltage slope which are obtained through the experiment data are not precise, and meanwhile the problem of the large calculated amount brought by simultaneous fitting of the five parameters in a traditional physical parameter solving process is solved.

Description

technical field [0001] The invention relates to a method for solving physical parameters of solar cells by using a mathematical explicit model. Background technique [0002] Due to the depletion of traditional energy such as coal and oil, and the incompatibility between the pollution brought by traditional energy and the concept of modern environmental protection, countries are vigorously developing new energy. Photovoltaic power generation has the advantages of being renewable, pollution-free, and noise-free, and has become an important part of new energy power generation. In the process of using solar panels, the establishment of its current-voltage model and parameter solution are of great significance, which are related to the utilization efficiency of solar power generation and grid connection. [0003] People have done a lot of research on the current-voltage model of solar cells, which are mainly divided into physical models and mathematical models. The physical mode...

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Problems solved by technology

[0003] People have done a lot of research on the current-voltage model of solar cells, which are mainly divided into physical models and mathematical models. The physical model is established based on the electrical characteristics of the physical devices inside the solar panel. Each parameter in the model has a clear physical meaning. At present The most commonly used physical model of photovoltaic cells is the single diode model. The shortcoming of this physical model is that its equation cannot be expressed explicitly, which brings great difficulties to the calculation of physical parameters.

[0006] (1) The physical parameter acquisition method needs to use the slope of the short-circuit point and the open-circuit point, and since the experimental data is a set of discrete points rather than a complete curve, it is difficult to obtain accurate dI / dV values ​​through the experimental data

[0007] (2) The existing physical parameter acquisition method needs to use the maximum power point (Vm, Im), and because the experimental data is a discrete point, the maximum power point in the data is not necessarily the real maximum power point of the solar panel

[0008] (3) In the existing method for solving physical model parameters, five parameters are simultaneously fitted, and the amount of calculation is large

[0009] (4) In the process of obtaining the mathematical model, the existing method is to take two discrete points (generally 0.6 times the open circuit voltage and 0.6 times the short circuit current point) to fit the curve, and there is a large error

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