2023-12-18 米国国立再生可能エネルギー研究所(NREL)
Researchers determined that rainfall is not enough to adequately clean solar panels covered in pollen.
◆米国エネルギー省再生可能エネルギー研究所（NREL）の研究チームによるもので、春の花粉が太陽パネルに付着することで、雨でも充分な洗浄ができず、光伝導の低下が発生すると結論づけています。これにより、花粉の問題を考慮せずに太陽光発電所が完全にクリーンされていると仮定するのは誤りであることが明らかになりました。特に南東部の環境では、花粉や生物による汚染のリスクと影響を理解するためにはまだ多くの研究が必要です。
＜関連情報＞
- https://www.nrel.gov/news/program/2023/nrel-research-finds-rain-not-enough-to-wash-pollen-from-solar-panels.html
- https://ieeexplore.ieee.org/document/10301702
太陽光発電所における花粉による汚損を調査 An Investigation on the Pollen-Induced Soiling Losses in Utility-Scale PV Plants
João Gabriel Bessa,Michael Valerino,Matthew Muller,Mike Bergin,Leonardo Micheli,Florencia Almonacid,Eduardo F. Fernández
IEEE Journal of Photovoltaics Published:30 October 2023
DOI:https://doi.org/10.1109/JPHOTOV.2023.3326560
Abstract
In this study, the impact of pollen as a PV soiling agent is investigated. The performance data of five utility-scale PV plants in North Carolina, USA, was collected and analyzed using two soiling extraction methods. Satellite and environmental data, including pollen counts, cropland, and vegetation, was also collected and analyzed to identify impacts to soiling losses. During the spring peak pollen season, performance losses of >15% were observed at all five sites. Partial performance recoveries following the pollen season were slow, with lack of correlation with rainfall. This means that the statistical soiling estimation methods that assume abrupt performance recovery from rain are not appropriate for pollen-impacted solar sites. When manual cleanings were performed on site the performance recovery ranged from 5% to 11% indicating persistent soiling impacts are present in this region. The results of this work provide new insights into the phenomenon of pollen deposition on PV systems, demonstrating that 1) soiling can also affect systems located in rainy locations and 2) that its effects cannot be determined using the current estimation methodologies.
