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Affiliation |
Green Transformation Research Center |
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Title |
Associate Professor |
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External Link |
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OTA Yasuyuki
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Research Areas 【 display / non-display 】
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Energy Engineering / Earth resource engineering, Energy sciences / 太陽光発電、P2G
Papers 【 display / non-display 】
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Testing and rating of vehicle-integrated photovoltaics: Scientific background Reviewed
Araki K., Ota Y., Nishioka K.
Solar Energy Materials and Solar Cells 280 2025.1
Language：English Publishing type：Research paper (scientific journal) Publisher：Solar Energy Materials and Solar Cells
We need to rush into the international standardization of the performance of VIPV. IEC TC82 PT600 and WG2 group carry out the standardization discussion. This work covers the scientific aspects behind the standardization. It consists of three layers: (1) Performance testing VIPV or curved PV modules by reproducible measurements; (2) Outdoor performance validation and correction modeling; (3) Energy rating. Unlike other PV installations, the relative position of the sun and its shading objects quickly and frequently moves so that the repeatable evaluation of the performance of VIPV was challenging. As a result of scientists and testing engineers worldwide, (1) we could develop a new testing protocol for the curved PV modules, (2) we observed the different performances in the curved photovoltaic modules and succeeded in reproducing in a simple numerical model, and (3) we developed Excel-level calculation methods for shading and partial-shading impact to irradiation onto photovoltaic modules on vehicles.
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Fabrication and evaluation of Bi2Te3-based thermoelectric device
Hirai Yuichi, Nakashima Koki, Nishioka Kensuke, Ota Yasuyuki, Nagaoka Akira
Journal of Ternary and Multinary Compounds 2024 ( 0 ) 5 - 8 2025
Language：Japanese Publishing type：Research paper (other academic) Publisher：The Japan Society of Applied Physics, Professional Group of Multinary Compounds and Solar Cells
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Model-based development of energy management systems for renewable energy
Nakashima Y., Manabe A., Tosakae M., Yonezawa Y., Ota Y., Nishioka K.
13th International Conference on Renewable Energy Research and Applications, ICRERA 2024 1599 - 1604 2024.11
Language：English Publishing type：Research paper (international conference proceedings) Publisher：13th International Conference on Renewable Energy Research and Applications, ICRERA 2024
We are using Model Based Development (MBD) techniques to design and implement energy management systems such as solar-to-hydrogen conversion (STH) systems. We have applied model-based development to a solar-to-hydrogen (STH) system with a unique power supply configuration of our own design, and achieved a daily STH efficiency of 18.78%. This was the highest efficiency for a sub-kilowatt-scale solar photovoltaic (PV) system in outdoor operation at that time. The concentrating photovoltaic (CPV) module, electrolyzer, and DC-DC converter were precisely modeled based on actual measured component characteristics, simulation verification of control methods, and control software implemented using automatic code generation techniques. The control software was implemented using automatic code generation technology. In addition, the feasibility of applying the software to a mega solar system was verified to confirm its effectiveness in system design.
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Outdoor evaluation of total cross-tied Si module under driving conditions Reviewed
Ota Y., Tamada K., Nakamura K., Yamaguchi M., Ohshita Y., Araki K., Nishioka K.
Solar Energy Materials and Solar Cells 274 2024.8
Authorship：Lead author, Corresponding author Language：English Publishing type：Research paper (scientific journal) Publisher：Solar Energy Materials and Solar Cells
This paper presents the fabrication and evaluation of a total cross-tied (TCT) Si module designed to mitigate the partial shading effect, which is known to reduce the output performance of vehicle-integrated photovoltaic (VIPV) modules. The TCT module, consisting of 27 Si solar cells interconnected both vertically and horizontally, demonstrated an 18.8 % decrease in output power when one cell was shaded. In contrast, the output of the series-parallel (SP) Si module decreased by 31.6 % under the same shading condition. Comparative analysis of the output performances of TCT, SP, and single-string commercial modules under three driving conditions revealed that increasing the number of strings helped alleviate the impact of partial shading. Notably, the TCT module configuration showed a positive impact on mitigating the partial shading effect.
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Effectiveness of the Concentrating Photovoltaics (CPV) Toward TW-Scale PV Production International coauthorship
Yamaguchi M., Araki K., Ota Y., Nishioka K., Zhang Y., Hallam B., Kojima N., Ohshita Y.
Conference Record of the IEEE Photovoltaic Specialists Conference 48 - 50 2024.6
Language：English Publishing type：Research paper (international conference proceedings) Publisher：Conference Record of the IEEE Photovoltaic Specialists Conference
Photovoltaics will play a vital role in a future net zero greenhouse gas emission energy systems. According to the TW Workshop held in 2023, annual PV production volume has been predicted to be about 3 TW since 2035. From the viewpoints of material sustainability, limitations of yearly production of various solar cells have been pointed out. In the case of Ag consumption, limits of annual production capacity for Si PERC (Passivated Emitter and Rear Cell), TOPCon (Tunnel Oxide Passivated Contact), and SHJ (Si Hetero Junction) solar cells are estimated by assuming 20% of Ag annual supply are 650 GW, 430 GW and 330 GW, respectively. The concentrator photovoltaics (CPV) has great potential for overcoming the sustainability of material resources compared to conventional crystalline Si PV and thin-film PV. This paper presents impact of material consumption upon annual production capacities of various solar cells by using CPV. Merits of CPV are estimated to be 50-500 times higher potential of yearly production volume compared to conventional PV (1-sun use).
Books 【 display / non-display 】
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2024年度光技術動向調査報告書
太田 靖之（ Role： Sole author , 5.7.1.3 車載）
一般社団法人光産業技術振興協会 2025.3
Language：Japanese Book type：Report
Presentations 【 display / non-display 】
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Principal Component Analysis for Solar Radiation on Vehicle Roof International conference
Kaiki Matsubayashi, Kenji Araki, Yasuyuki Ota, Shinya Iwasaki, Yohei Hosokawa, Kensuke Nishioka
PVinMotion 2025 2025.3.12
Event date： 2025.3.12 - 2025.3.15
Language：English Presentation type：Oral presentation (general)
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Development of Total Energy Simulator for High Altitude Platform Station Operation International conference
Naoki Mukai, Kenji Araki, Kensuke Nishioka, Kohei Okada, Yasuyuki Ota
PVinMotion 2025 2025.3.12
Event date： 2025.3.12 - 2025.3.15
Language：English Presentation type：Oral presentation (general)
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Direct detection technique of vibration and resonance of the solar cells inside the VIPV modules International conference
Yasuyuki Ota, Kenji Araki, Shota Matsushita, Ryota Tsuji, Yuhi Honda, Kensuke Nishioka
PVinMotion 2025 2025.3.13
Event date： 2025.3.12 - 2025.3.15
Language：English Presentation type：Poster presentation
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PV on Heavy Duty Vehicles (HDVS): Validation of the fuel-saving merits International conference
Kensuke Nishioka, Kenji Araki, Taiyou Niina, Takumi Konuma, Makoto Tanaka, Yasuyuki Ota, Shiro Sakamoto
PVinMotion 2025 2025.3.13
Event date： 2025.3.12 - 2025.3.15
Language：English Presentation type：Poster presentation
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Development of solar irradiance prediction technology using fisheye image for vehicle-integrated photovoltaic power generation International conference
Nobuteru Takeshita, Naoki Mukai, Kenji Araki, Kensuke Nishioka, Yasuyuki Ota
PVinMotion 2025 2025.3.13
Event date： 2025.3.12 - 2025.3.15
Language：English Presentation type：Poster presentation
Awards 【 display / non-display 】
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Oral Presentation Awards
2024.11 35th International Photovoltaic Science and Engineering Conference PV for HAPS(High Altitude Platform): Tensor-Matrix-based modeling and measurement validation
Kenji Araki, Kohei Okada, Naoki Mukai, Shota Matsushita, Seiichi Kiyama, Yasuyuki Ota, Koji Nishiyama, Kensuke Nishioka
Award type：Award from international society, conference, symposium, etc.
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Poster Awards
2024.11 35th International Photovoltaic Science and Engineering Conference Rapid Generation of Solar Spectrum with Sensor Photodiode Arrays
Kaiki Matsubayashi, Kenji Araki, Yasuyuki Ota, Kensuke Nishioka
Award type：Award from international society, conference, symposium, etc.
Grant-in-Aid for Scientific Research 【 display / non-display 】
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太陽光由来メタン合成システムのシステム最適化および製造コスト削減
Grant number：22K05008 2022.04 - 2025.03
独立行政法人日本学術振興会 科学研究費基金 基盤研究(C)
Authorship：Principal investigator
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システム最適化した高効率集光型太陽電池水素生成機構の高精度コスト試算モデルの構築
Grant number：18K05015 2018 - 2021.03
科学研究費補助金 基盤研究(C)
Authorship：Principal investigator