电致发光检测中光伏组件加热的效果评估

IF 1.9 Q3 PHYSICS, APPLIED
Lukas Koester, Emanuel Vallarella, A. Louwen, S. Lindig, D. Moser
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引用次数: 0

摘要

电致发光成像在光伏组件上的应用近年来有所增加,因为它可以可靠而详细地识别退化和故障。在未来的工厂中,使用具有双向功能的逆变器可以克服耗时的电源连接,允许直接对连接的模块串进行反向供电。温度会影响光伏组件的开路电压,因此在回电时必须考虑温度。本文研究了不同类型光伏组件在电致发光检测过程中因回电而产生的发热问题。通过能量平衡计算和实验验证,温度升高到饱和时约为20°C,产生的电压降高达3 V。此外,这些变化对记录的发光强度也有影响:电致发光信号强度在回电开始和达到饱和温度之间有所下降。为了将结果应用于实际场景,介绍了电致发光逆变器的电致发光窗口,给出了可以提供的电流和电压的边界。结合对连接的光伏组件串的暗电流-电压曲线的模拟,可视化了电致发光检测的可能性。最后,讨论了该加热现象在融雪过程中的适用性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Evaluating the effects of photovoltaic module heating during electroluminescence inspection
The application of electroluminescence imaging of photovoltaic modules increased in the last years, due to the reliable and detailed identification of degradation and failures. In future plants the time-consuming connection of power supplies could be overcome by use of inverters with bi-directional functionality, allowing backpowering of connected module strings directly. Temperature influences the open-circuit voltage of photovoltaic modules and must therefore be considered during backpowering. This work investigates the heating due to backpowering of photovoltaic modules of different types during electroluminescence inspection. The temperature increase until saturation is estimated by energy balance calculations and experimentally verified to be around 20 °C, with resulting voltage drops of up to 3 V. Further, these changes have an effect on the recorded luminescence intensity: a decrease of the electroluminescence signal intensity between beginning of backpowering and reaching saturation temperature is shown. For application of the results to a real-world scenario, the electroluminescence window of an electroluminescence-ready inverter is introduced, giving the boundaries of current and voltage that can be supplied. Combined with a simulation of the dark current–voltage curves of a connected photovoltaic module string, the electroluminescence inspection possibilities are visualized. Finally, the applicability of this heating phenomenon for snow melting is discussed.
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来源期刊
EPJ Photovoltaics
EPJ Photovoltaics PHYSICS, APPLIED-
CiteScore
2.30
自引率
4.00%
发文量
15
审稿时长
8 weeks
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