赤外線カメラによる太陽電池モジュールのバイパス回路の開放故障検出技術

—日射強度の故障検出への影響—

抄録

When the bypass circuit of the PV module is open and the performance of solar cell drops by partial shadow, abnormality and so on, a part of solar cells generates heat and becomes a hotspot. In the worst case, since this malfunction is likely to lead to the fire, early detection is important. The technology proposed in this paper is intentionally to increase the temperature of the faulty part of PV module by applying an AC voltage with a power source. The temperature change is observed with an IR camera, and the fault point is identified by the frequency analysis to avoid the disturbance such as surrounding building and so on. In this paper, we describe the principle of detection technology and the effect of irradiance.