Photovoltaic module temperature real-time calculation method based on Lambert W function

A photovoltaic module and function technology, applied in the field of real-time calculation of photovoltaic module temperature, to achieve the effect of saving device costs and improving large errors

Pending Publication Date: 2020-02-11
HEFEI UNIV OF TECH +1
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Problems solved by technology

[0005] In order to overcome the deficiencies in the prior art, the present invention proposes a real-time calculation method for the temperature of photovoltaic modules based on the Lambert W function, in order to obtain the

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  • Photovoltaic module temperature real-time calculation method based on Lambert W function
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  • Photovoltaic module temperature real-time calculation method based on Lambert W function

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Embodiment Construction

[0036] In this embodiment, a real-time calculation method for the temperature of a photovoltaic module based on the Lambert W function, such as figure 1 shown, including the following steps:

[0037] 1) According to the physical model equation of the photovoltaic module I-V characteristic equation shown in formula (1), the engineering I-V characteristic equation shown in formula (2) is derived:

[0038]

[0039] In formula (1): I ph is the photogenerated current, I 0 is the reverse saturation current, q is the electronic charge (1.6×10 19 C), K is the Boltzmann constant, T is the absolute temperature, A is the diode factor, R sh For parallel resistors, the five parameters I ph , I 0 , R s , R sh , A are not only related to temperature and irradiance, but also difficult to determine, so it is difficult to apply in engineering. To this end, a photovoltaic module model for engineering is proposed. Reasonable simplification based on the physical model equation can repro...

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Abstract

The invention provides a photovoltaic module temperature real-time calculation method based on a Lambert W function. According to the method, under different temperature and irradiance conditions, theI-V characteristic curve of the same photovoltaic module changes along with the change of the temperature and the irradiance; the method comprises the following steps: obtaining a working temperatureequation of the photovoltaic module, i.e., the characteristic of I = f (V, S, T), performing explicit processing through a Lambert W function after the working characteristic equation is inversely solved, thereby obtaining a working temperature equation of the module, and substituting information convenient to obtain in the photovoltaic power station into a temperature calculation equation, thereby obtaining the actual working temperature of the photovoltaic module through relatively accurate calculation. According to the method, the temperature of the photovoltaic module can be accurately obtained without installing a large number of temperature sensors, so that the related problems of module power generation capacity prediction, module fire early warning and the like can be solved.

Description

technical field [0001] The invention relates to a real-time calculation method for the temperature of a photovoltaic module based on a Lambert W function, and belongs to the technical field of operation and maintenance analysis of a solar photovoltaic power station. Background technique [0002] As the temperature increases, from a microscopic point of view, the bandgap width of solar cells decreases, the phonon energy increases, and the carrier mobility decreases. The reduction of bandgap width and the increase of phonon energy will lead to the increase of short circuit current; the decrease of carrier mobility will lead to the decrease of open circuit voltage and fill factor. And because the conversion efficiency of solar cells is related to short-circuit current, open-circuit voltage, and fill factor, among which the open-circuit voltage has the greatest impact on power generation efficiency, and the reduction of open-circuit voltage will lead to a decrease in the power g...

Claims

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Application Information

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IPC IPC(8): G06F30/20
Inventor 汪海宁李欣李小平张健苏建徽
Owner HEFEI UNIV OF TECH
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