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태양광 발전설비 안정성 향상을 위한 바이패스 다이오드 지능형 냉각 시스템
고재환(Jaehwan Ko),김충일(Chungil Kim),이충근(Chung-Geun Lee),이득광(Deukgwang Lee),고명근(Myeong-Geun Ko),고석환(Suk-Whan Ko),송형준(Hyung-Jun Song) 대한전기학회 2021 전기학회논문지 Vol.70 No.12
A Bypass diode maintains the efficiency and stability of photovoltaic systems (PV) under partial shading. However, the bypass diode failure may cause damage and fire in the PV system because the generated current continuously flows through it. Thus, we suggest an intelligent cooling fan system for the bypass diode to ensure the stability of PV. The cooling system consisted of a k-type temperature sensor, electrically controlled fan and auto-control system. If the temperature of bypass diode (Tdiode) exceeds specific points owing to partial shading and/or its failure, the cooling system will automatically turn on the fan to prevent bypass diode from abnormal heating. The analysis of Tdiode indicates that the system effectively decreases it below the melting point of the junction box (177 ℃). The cooling system is adequate for PV under partal shading or with a damaged diode. Consequently, our suggested intelligent cooling system can contribute to the safe operation of PV.