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결정질 실리콘 태양광 모듈의 Potential Induced Degradation 진단 분석
오원욱,박노창,천성일 한국태양광발전학회 2018 한국태양광발전학회지 Vol.4 No.2
The potential induced degradation (PID) phenomenon of crystalline silicon photovoltaic (PV) modules has been often found in outdoor PV systems until recently since firstly reported in 2010. Many studies have been conducted about the mechanism and the preventive methods, but systematic diagnosis of the PID has not been applied on-site. This paper focuses on analysis of 5 categories and 10 PID diagnosis methods using the monitoring data, light current-voltage, dark current-voltage, infrared and electroluminescence. We expect to contribute to improvement of power generation through PID diagnosis and troubleshooting in PV plants.
오원욱(Oh Wonwook),전성근(Jeon Seonggeun),윤아영(Yoon Ayoung),김대장(Yoon Ayoung),최훈주(Choi hoonjoo) 한국태양에너지학회 2021 한국태양에너지학회 논문집 Vol.41 No.2
A photovoltaic (PV) string consists of PV modules that are connected in series. When partial shading occurs in the PV modules, the total PV string current is lowered. When the partial shading becomes severe, the bypass diode operates. Most PV systems are exposed to partial shading by nearby terrain, rather than an actual shaded flat environment. In this study, shading analysis was performed at 19 points of a 33.2 kWp solar power plant installed on the roof of a building, and the shaded irradiance ratio at the PV module location was estimated using this result. We compared the results of the performance ratio monitored for one year. As a result, the expected output ratio of the shading analysis compared to normal was found to be 89.6%, and the annual performance ratio was 90.2%.