Temperature and reverse voltage across a partially shaded Si PV cell under hot spot test condition

Qi Zhang, Qun Li
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引用次数: 22

Abstract

Whether a crystalline Si PV cell in a module would fail in hotspot endurance test under partial shading condition is a practical question to many cell and module manufacturers. Answers to this question are associated with the reverse bias and elevated temperature across a partially shaded cell in a string of a module that is under illumination. This study reveals the reverse bias and temperature. It is found that the temperature has almost a linear relationship with the string length, and the reverse voltage is related to both cell Vpm and string length. The maximum reverse voltage and temperature under given string length and cell Vpm are summarized, which can serve as a pair of criteria to simulate the hot spot test condition to examine individual cell, study its hotspot properties. The elevated temperature can easily reach 130°C, when tested in a 24 cell string that is under short circuit condition during the test. And, the temperature can reach 150°C in a 30 cell string, which may cause permanent damage in module in such a test. Thus, it is cautioned that substantial increase in string length from 24 cells is not a realistic practice.
在热点测试条件下,部分遮光硅光伏电池的温度和反向电压
在部分遮阳条件下,组件中的晶体硅光伏电池是否会在热点耐久性测试中失败,这是许多电池和组件制造商面临的现实问题。这个问题的答案与在照明下的模块串中部分阴影单元的反向偏置和升高的温度有关。这项研究揭示了反向偏置和温度。结果表明,温度与串长基本成线性关系,反向电压与电池Vpm和串长均相关。总结了给定串长和电池Vpm下的最大反向电压和最大反向温度,可作为模拟热点试验条件的一对判据,以检验单个电池,研究其热点特性。当在测试过程中处于短路状态的24个电池组中进行测试时,升高的温度很容易达到130°C。并且,在30个电池串中温度可达150°C,在此类测试中可能会对模块造成永久性损坏。因此,需要注意的是,在24个单元的基础上大幅增加字符串长度是不现实的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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