Method for testing photovoltaic module through infrared imagery analysis

Abstract

The invention discloses a method for testing a photovoltaic module through infrared imagery analysis. The method comprises the following steps: step 1, detecting the appearance of the photovoltaic module, and then testing the power output of the photovoltaic module under the standard testing condition, and testing the open-circuit voltage Uoc and short-circuit current Isc of the photovoltaic module under the standard testing condition; step 2, charging the photovoltaic module with current and voltage by a supply unit, wherein U larger than (1+3%)Uoc, and I is smaller than Isc, and after the component is thermally balanced, shooting the infrared image of the photovoltaic module by a thermal infrared imager; step 3, selecting the temperature testing range according to the infrared image, and calculating the temperature difference between the highest temperature and the average temperature of the photovoltaic module. After the photovoltaic module is powered on to achieve the thermal balance, the infrared image is shot by the thermal infrared imager, and the temperature difference between the highest temperature and the average temperature of the photovoltaic module is calculated, so as to evaluate the capability of withstanding high temperature of the photovoltaic module, and have guiding significance in reduction and prevention of a hot-spot phenomenon.

Description

technical field [0001] The invention belongs to the technical field of photovoltaic module testing, and in particular relates to a testing method for infrared imaging analysis of photovoltaic modules. Background technique [0002] When the photovoltaic modules are working outdoors, the photovoltaic modules are in the state of output power in series, the modules themselves are in a high temperature state, and the ambient temperature and humidity also fluctuate with the seasons. There is no testing method for photovoltaic modules in the prior art. [0003] During the manufacturing process of photovoltaic modules, the components may be locally heated during operation due to problems such as poor raw materials of the cells, poor welding of the cells or junction boxes, etc. Poor raw materials of the battery sheet may cause serious hot spot effect. If the temperature generated by the hot spot effect exceeds a certain limit, the solder joints on the battery module will be melted a...

AI Technical Summary

Problems solved by technology

[0003] During the manufacturing process of photovoltaic modules, the components may be locally heated during operation due to problems such as poor raw materials of the cells, poor welding of the cells or junction boxes, etc.

Poor raw materials of the battery sheet may cause serious hot spot effect. If the temperature generated by the hot spot effect exceeds a certain limit, the solder joints on the battery module will be melted and the grid lines will be destroyed, which will lead to the scrapping of the entire photovoltaic module. The hot spot effect Reduce the actual service life of photovoltaic modules by at least 10%

On the other hand, due to the local heating caused by welding, this local heating may cause the risk of module burning; especially when the photovoltaic module is at high temperature for a long time, it is easier to burn out