成果報告書詳細
管理番号20090000000081
タイトル*平成20年度中間年報 太陽光発電システム共通基盤技術研究開発 発電量評価技術の研究開発 分光日射強度推定物理モデルの開発
公開日2009/12/9
報告書年度2008 - 2008
委託先名国立大学法人岐阜大学
プロジェクト番号P07015
部署名新エネルギー技術開発部 太陽電池グループ
和文要約本研究開発は(独)産業総合技術研究所,(財)電気安全環境研究所,(財)日本気象協会,岐阜大学の4者によって行なわれる研究開発「発電量評価技術の研究開発」の一部であり,太陽光発電システムの発電量を計算機上で評価・予測可能な数値モデルの開発を担っている.
本年度は,地上に到達する日射のスペクトル強度が推定可能な,分光日射強度推定物理モデルの構築を進めた.このモデルは雲微物理改良気象モデルによって推定された大気中の雲水や水蒸気などの気象因子から,雲を考慮した地上日射のスペクトル強度を推定するモデルである.このモデルは米国再生可能エネルギー研究所が作成した大気放射モデルSMARTS2を基礎としている.このモデルは分光日射強度を推定するモデルであるが,雲の影響を考慮することができない.そこで本研究開発では物理気象モデルから得られた雲水などの気象因子を元に,雲による日射の散乱・吸収を分光レベルで推定可能なCloudモデルを構築し,SMARTS2と結合させることにより,雲が存在する場での日射強度を推定できるモデルを開発した.このモデルの推定結果は(財)日本気象協会によって提供された分光日射強度の計測結果を良好に再現しており,モデルの有用性を示すことができた.
英文要約Project name: Research and Development of Common Fundamental Technologies for Photovoltaic Generation Systems. Development of new solar cell evaluation technologies. Development of a physical model for evaluation of spectral solar irradiation
A spectral solar irradiation model considering the presence of clouds by shading and scattering the solar ray is developed in this research project for evaluation of the power generation efficiency of the photovoltaic generation systems. This model is based on the spectral radiation model, SMARTS2 (A Simple Model of the Atmospheric Radiative Transfer of Sunshine) developed by the National Renewable Energy Laboratory (NREL) and the Florida Solar Energy Center. SMARTS2 evaluates the spectral solar radiation on the ground, but it doesn't consider the effect of clouds to the solar radiation; and it can evaluate the radiation only under clear sky. The clouds shade and scatter the ray of the sun, and affect strongly the amount and spectral solar irradiation on the ground. A solar radiative transfer model in clouds, named Cloud Model is developed and is coupled with the SMARTS2 for the evaluation of the spectrum solar irradiation on the ground under arbitrary weather conditions. The cloud model uses some meteorological parameters, e.g. vapor in air or water content of clouds, computed with the advanced meteorological model that is also developed in this project, and in which the representation of the classification of the ice and water particles in the atmosphere is improved in an ordinary numerical model. The cloud model estimates the spectrum solar ray affected by the clouds, from the meteorological parameters. The model's results are taken into the SMARTS2, and the spectral solar irradiation including the clouds' effects is evaluated.
The spectral solar irradiance at Gifu, Japan is computed with the presented model, and compared with the observed data measured by the Japan Weather Association in the same location and time. The computed data shows good agreement with the observed one under not only clear sky conditions but also under cloud sky. These results lead to conclude that the presented model in this project can evaluate the spectral solar irradiance on the ground under arbitral weather conditions.
This research project is a part of the project entitle "Development of new solar cell evaluation technologies" jointly performed with the National Institute of Advanced Industrial Science and Technology, AIST, Japan Electrical Safety and Environment Technology Laboratories, JET, Japan Weather Association, JWA, and Gifu University.
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