Experimental research on the relationship between bypass diode configuration of photovoltaic module and hot spot generation
Experimental research on the relationship between bypass diode configuration of photovoltaic module and hot spot generation
复制标题
光伏组件旁路二极管配置与热点产生关系的实验研究
DOI：
10.1088/1674-4926/39/12/124014
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发表时间：
2018-12
影响因子：
5.1
通讯作者：
Cong Gao
中科院分区：
文献类型：
--
作者：
Cong Gao
热点是光伏（PV）组件中的可靠性问题，其中不匹配或遮蔽的电池会显着升温并降低光伏组件的输出功率性能。由于热点导致的光伏电池温度过高会损坏电池封装并导致第二次击穿，这两者都会对光伏组件造成永久性损坏。在目前的系统中，旁路二极管被用来缓解热点问题。本文采用5个配置了不同数量旁路二极管的商用多晶硅光伏组件，研究了旁路二极管对遮光电池反向偏置电压的影响以及由此产生的热点现象。随着旁路二极管数量的增加，阴影电池的反向偏置电压、热点概率和严重程度降低。阴影电池的负端电压伴随旁路二极管的关闭是产生热点的必要条件。在光伏组件中每个电池都有单独的旁路二极管的极端情况下，它仍然不能避免5 - 7cm2遮阳区域下热点的危害，但热点的概率降低到最小0.41%。
A hot spot is a reliability problem in photovoltaic (PV) modules where a mismatched or shaded cell heats up significantly and degrades the PV module output power performance. High PV cell temperature due to a hot spot can damage the cell encapsulate and lead to second breakdown, which both cause permanent damage to the PV module. In present systems, bypass diodes are used to mitigate the hot spot problem. In this work, five commercial polysilicon PV modules configured with different numbers of bypass diodes are used to study the influence of bypass diodes on the reverse bias voltage of a shaded cell and the resulting hot spot phenomenon. The reverse bias voltage of the shaded cell, and the hot spot probability and severity decrease as the number of bypass diodes increases. Negative terminal voltage of a shaded cell accompanied by a switched-off bypass diode are the necessary condition for hot spot generation. In an extreme case where each cell has an individual bypass diode in a PV module, it still cannot avoid the hazards of a hot spot under the shading areas of 5–7 cm2, but the probability of a hot spot is reduced to a minimum of 0.41%.
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