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A method for extracting parameters of each mismatched component in a photovoltaic string

A technology of photovoltaic modules and photovoltaic groups, which is applied in special data processing applications, design optimization/simulation, etc., and can solve problems such as discontinuous changes and troughs

Active Publication Date: 2022-05-10
CHINA JILIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The bypass diode solves the hot spot problem caused by the mismatch between components to a certain extent, but causes the overall output of the string to show a discontinuous change, that is, before and after the bypass diode is turned on and off, the photovoltaic The current-voltage output characteristic curve of the string changes abruptly at this state point, and the power-voltage output characteristic of the photovoltaic string appears a valley at this state point; in summary, once a bypass diode in the photovoltaic string is turned on, its power- Multiple power peaks appear in the voltage output characteristics, and the power-voltage curve on a single peak interval is no longer a complete curve from short-circuit current to open-circuit voltage of the component in this working state

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  • A method for extracting parameters of each mismatched component in a photovoltaic string
  • A method for extracting parameters of each mismatched component in a photovoltaic string
  • A method for extracting parameters of each mismatched component in a photovoltaic string

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Embodiment Construction

[0048] The invention provides a method for separating parameters of mismatched components in a photovoltaic string; through the method, the parameters of mismatched components in the string can be separated and extracted, and used as a basis for fault diagnosis of the photovoltaic string.

[0049] Solar cells use the photovoltaic effect of the P-N junction to convert light energy into electrical energy. Under the condition of light, the current-voltage characteristics of the current show the characteristics of a diode, that is, the current changes exponentially with the voltage. If the solar cell is regarded as a constant current source, the bulk resistance of the semiconductor material, the contact resistance of the electrode and the semiconductor material, and the recombination resistance of the carriers at the interface are regarded as series resistance, and the edge leakage current of the battery and the leakage current of the metal bridge of the battery are equivalent to P...

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Abstract

The invention provides a method for extracting parameters of each mismatched component in a photovoltaic string, which can be used in the photovoltaic string in its P‑V When there are multiple power peaks on the output curve, five parameters are extracted, including the photogenerated current, diode reverse saturation current, diode ideality factor, series resistance and parallel resistance of the components involved in each peak. Based on these five parameters, this method can use the change of the five parameter values ​​of different components under one string to judge the working condition of the component, therefore, this method can also be used for fault diagnosis of photovoltaic strings.

Description

technical field [0001] The invention belongs to the technical field of photovoltaic power generation, and specifically relates to a method for extracting parameters of mismatched components in a photovoltaic string. Background technique [0002] Fossil energy is one of the most important energy sources in the current society, but it also exposes many problems, such as huge air pollution and increasingly scarce raw materials. At the same time, it will also be one of the culprits of global warming; solar energy resources as As one of the new energy sources, it is environmentally friendly and non-polluting, especially in the field of photovoltaics, which has been extensively studied by countries all over the world. [0003] Generally speaking, a photovoltaic array is composed of photovoltaic strings connected in parallel, a photovoltaic string is composed of photovoltaic modules in series, and a photovoltaic module is composed of a fixed number of solar cells connected in serie...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/20
CPCG06F30/367Y02E60/00
Inventor 蔡慧魏缪宇陈洪涛
Owner CHINA JILIANG UNIV