Abstract PV (Photovoltaic) power systems have been rapidly installed and spreading worldwide in recent years. And there is a belief that the PV power plant will operate stably for more than 25 years. However, the PV modules have an unexpected failure. In this paper, we diagnosed a 10-year-old power plant using drone with infra-red (IR) camera, current-voltage (I-V) and electroluminescence (EL) measurement. The approximately 1 MW plant, consisting of two different PV modules, 200 W and 220 W, showed various failure modes. 59% PV modules failure caused an output loss, and an inverter with a serious loss is expected to degrade more than its annual degradation rate in PV strings above 40%. As a result, the power loss was quantitatively estimated to hot spot, bypass diode failure and degradation rate, and the capacity of the current PV system was evaluated at 88.3% and 93.2%.

中文翻译：

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基于10年现场老化1兆瓦光伏电站光伏系统性能和故障的评估

摘要 近年来，光伏（Photovoltaic）电力系统在世界范围内得到迅速安装和普及。并且有一种信念，该光伏电站将稳定运行 25 年以上。然而，光伏组件出现了意外故障。在本文中，我们使用带有红外 (IR) 摄像头、电流电压 (IV) 和电致发光 (EL) 测量的无人机诊断了一座已有 10 年历史的发电厂。大约 1 兆瓦的电厂由两个不同的光伏模块（200 瓦和 220 瓦）组成，显示出各种故障模式。59% 的光伏组件故障会导致输出损失，而损失严重的逆变器预计退化程度超过其光伏组串年退化率 40% 以上。结果，功率损耗被定量估计为热点、旁路二极管故障和退化率，