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Nonlinear parameter calculation method for simulating aging failure of photovoltaic cell models

A photovoltaic cell model and parameter calculation technology, which can be used in computing, electrical digital data processing, special data processing applications, etc., and can solve problems such as fewer photovoltaic cells.

Inactive Publication Date: 2015-07-15
TIANJIN UNIV
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Problems solved by technology

The research on the hot spot problem has been developed to the level of fault location, but there are few related researches on the aging problem of photovoltaic cells at home and abroad

Method used

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  • Nonlinear parameter calculation method for simulating aging failure of photovoltaic cell models
  • Nonlinear parameter calculation method for simulating aging failure of photovoltaic cell models
  • Nonlinear parameter calculation method for simulating aging failure of photovoltaic cell models

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Embodiment Construction

[0039] The packaging structure of photovoltaic cells is: ultra-white glass - ethylene-vinyl acetate copolymer (EVA) - battery sheet - ethylene-vinyl acetate copolymer (EVA) - back plate. Since the properties of photovoltaic cells are stable and the backplane mainly plays a supporting role in photovoltaic modules, when analyzing the external characteristics of photovoltaic cell aging, the influence of ultra-clear glass and EVA aging is mainly considered (the aging cycle of semiconductor materials is relatively longer).

[0040] Ultra-clear glass is exposed to the external environment, and external factors such as light and oxygen, temperature, and humidity will cause it to age. The main signs of aging are yellowing, brittleness, mechanical strength, and light transmittance on the surface of the glass plate. The main reason for the aging of EVA is the very small amount of oxygen remaining inside the finished photovoltaic module. EVA reacts with oxygen, and the reaction speed is a...

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Abstract

The invention relates to a nonlinear parameter calculation method for simulating the aging failure of photovoltaic cell models, which includes the following steps: (1) a translucent film blocking method is adopted to decrease irradiance received by a photovoltaic panel in order to simulate the aging failure of the photovoltaic panel, and the relation between the number of translucent film blocking layers and irradiance attenuation is measured; (2) a relation curve between blocking film layer numbers (C) and aging degrees (L) is created; (3) the difference of blocking degrees is utilized to simulate the different aging degrees, a load in a photovoltaic panel circuit is regulated and the voltage and current values of the circuit are acquired, and thereby an I-V output curve of the photovoltaic panel under different irradiances and the different aging degrees is obtained; an external characteristic I-V relation of the photovoltaic panel is established; (4) for the I-V output curve of the photovoltaic panel under the different irradiances and the different aging degrees, optical parameter values are obtained by parameter identification. The nonlinear parameter calculation method can obtain the nonlinear parameter change laws of the aging failure of the photovoltaic cell models.

Description

Technical field [0001] The invention belongs to the technical field of photovoltaic cells, and relates to a method for obtaining parameters of photovoltaic cells. Background technique [0002] Facing the pressure of energy crisis and environmental protection, photovoltaic solar energy has been valued by various countries for its cleanness and environmental protection, and has become the trend of future energy development. The faults of photovoltaic cells are divided into aging, slivers, hot spots, etc. The research on the hot spot problem has been developed to the level of fault location, but there are few related researches on the aging problem of photovoltaic cells at home and abroad. Contents of the invention [0003] The purpose of the present invention is to provide a method for obtaining the change law of aging fault parameters of the photovoltaic cell model. Technical scheme of the present invention is as follows: [0004] A nonlinear parameter calculation method...

Claims

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Application Information

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IPC IPC(8): G06F19/00
Inventor 程泽王宇翠巩力程思璐
Owner TIANJIN UNIV
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