Solar cell surface cleanliness judgment method based on open circuit voltage measurement

A solar cell and open-circuit voltage technology, which is applied in photovoltaic power generation, electrical components, photovoltaic system monitoring, etc., can solve problems such as the inability to realize online measurement of solar cell open-circuit voltage, reduce operation and maintenance costs, improve operation and maintenance efficiency, and expand content effect

Active Publication Date: 2018-08-03
TSINGHUA UNIV
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Problems solved by technology

The common point of these methods is that the solar cell needs to be separated from the original system, which belongs to offline measurement, and the online measurement of the open circuit voltage of the solar cell cannot be realized.

Method used

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  • Solar cell surface cleanliness judgment method based on open circuit voltage measurement
  • Solar cell surface cleanliness judgment method based on open circuit voltage measurement
  • Solar cell surface cleanliness judgment method based on open circuit voltage measurement

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Embodiment Construction

[0025] The present invention proposes a method for judging the surface cleanliness of a solar cell based on open-circuit voltage measurement, which will be further described in detail below in conjunction with the accompanying drawings and specific examples.

[0026] The present invention proposes a method for judging the surface cleanliness of a solar cell based on open circuit voltage measurement, comprising the following steps:

[0027] (1) Select a solar cell to be detected (there is no specific requirement for the solar cell model, and Jinko XX model solar cell module is used as an example in this embodiment), and measure a series of ambient temperatures T 01 ,T 02 ,...T 0m The corresponding equivalent series resistance value R of the solar cell s，01 , R s,02 ,...R s,0m (m is the measurement serial number, and the value range of the ambient temperature is generally the upper and lower limit values ​​of the battery’s working environment temperature. There is no special...

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Abstract

The invention relates to a solar cell surface cleanliness judgment method based on open circuit voltage measurement, which belongs to the field of new energy and efficient energy conservation. According to the invention, the corresponding open circuit voltage and equivalent series resistance of a solar cell in a clean state at different ambient temperatures are measured; the fitting curve of the open circuit voltage and ambient temperature and the fitting curve of the equivalent series resistance and ambient temperature under the specified illumination intensity in the clean state of the solarcell are acquired respectively; in a working state, the output voltage, current and ambient temperature of the solar cell at a certain moment under the same illumination intensity are measured; the open circuit voltage of the working solar cell at the moment is calculated; the corresponding open circuit voltage of the solar cell in the clean state at the ambient temperature at the moment is acquired through the fitting curve; and the cleanliness of the surface of the solar cell is determined through the change of the open circuit voltage. According to the invention, the cleanliness of the surface of the solar cell is judged online; the online monitoring content of the solar cell is expanded; the operation and maintenance cost can be reduced; and the operation and maintenance efficiency can be improved.

Description

technical field [0001] The invention relates to a method for judging the surface cleanliness of a solar cell based on open-circuit voltage measurement, and belongs to the technical field of new energy and high-efficiency energy-saving. Background technique [0002] By the end of 2016, the total installed capacity of photovoltaic power plants in China had reached 77.42GW, ranking first in the world. While the photovoltaic industry continues to develop, the operation and maintenance level of photovoltaic power plants should also be continuously improved. Among them, through the development of online monitoring technology, photovoltaic power plants can keep abreast of the working status of solar cells, accurately locate faults and perform refined maintenance and repairs, which will greatly reduce operating costs and improve power generation efficiency. [0003] PN type solar cells have been widely used in actual industrial production, especially in the photovoltaic power gener...

Claims

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Application Information

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IPC IPC(8): H02S50/15
CPCH02S50/15Y02E10/50
Inventor 李成龙邹旭东王红杨士元
Owner TSINGHUA UNIV
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