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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%.
태양광 발전소의 Snail trail 열화 현상과 출력 손실의 영향성 분석
오원욱(Oh Wonwook),김대성(Kim Daesung),전성근(Jeon Seonggeun),윤아영(Yoon Ayoung),김남승(Kim Namseung),김상수(Kim Sangsoo),서근원(Seo Kun Won),최훈주(Choi hoonjoo) 한국태양에너지학회 2020 한국태양에너지학회 논문집 Vol.40 No.6
The snail trail is a common degradation phenomenon that is observed in solar power plants. Although the occurrence of cosmetic problems has been reported in previous studies, the contribution of these problems to the actual power loss is negligible. However, the cracking of the solar cell induces a loss in the output. We analyzed the results of the thorough investigation of a 95 kWp solar power plant that was operated in the field for 5 years. The snail trail phenomenon was observed in a specific module using current-voltage measurement, electroluminescence analysis, and visual inspection. We evaluated the impact of the loss in the generated power via image extraction.