著者

朴 大欽 土井 雄介 石田 政義

出版者

The Institute of Electrical Engineers of Japan

雑誌

電気学会論文誌. B, 電力・エネルギー部門誌 = The transactions of the Institute of Electrical Engineers of Japan. B, A publication of Power and Energy Society (ISSN:03854213)

巻号頁・発行日

vol.131, no.7, pp.621-629, 2011-07-01

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So far, as a part of NaBH₄-H₂-Fuel Cell study we have been through optimization of hydrogen production reactor size and operating conditions to reach 100% of hydrogen production rate. Moreover, the potential of NaBH₄-H₂-Fuel Cells were verified by testing a 1000mL pressurebuffer for steady hydrogen supply under variable load conditions within maximum limit of 1.2kW. However, the buffer used gives rise to decreased energy density of the system due to its big size relatively to other components. Hence, minimized buffer volume under the limit of applied conditions is required to compact the system. In this study, the pressurebuffer volume which satisfies load following as well as compact size is found. Load following ability is approved as a result of hydrogen generation system operation, which has 325mL and 170mL buffer volume at 0°C and 20°C respectively within load variation of the average load 700W, peak load 1200W and 2 seconds of load cycle. Furthermore, NaBH₄-H₂-Fuel Cell's energy density is calculated. At last, all these come into the result that NaBH₄-H₂-Fuel Cell has high usefulnessas a high density mobile power source over 2.7kWh.

著者

石田 政義

出版者

つくば3Eフォーラム委員会(筑波研究学園都市交流協議会), 筑波大学

雑誌

第7回つくば3Eフォーラム会議資料

巻号頁・発行日

2014-01

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2014年1月25日(土) つくば市庁舎

著者

周 卓敏 前田 哲彦 石田 政義

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌B(電力・エネルギー部門誌) (ISSN:03854213)

巻号頁・発行日

vol.133, no.1, pp.19-25, 2013-01-01 (Released:2013-01-01)

参考文献数

23

被引用文献数

2 5 1

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This paper presents capacity planning and economical evaluation of a renewable power system proposed for Okushiri Island, which is a remote island in the southwest of Hokkaido. In this system, the power demand is mainly provided by photovoltaic, wind turbine. Batteries are used as short time energy storage, and a hydrogen storage system (composed of water electrolyzer, hydrogen storage, and fuel cell) is used as long time energy storage. Optimal capacities of these power sources are those meet the required supply reliability, with the lowest cost. As the first step in the capacity planning, mathematical models for characterizing components are explained. The second step is to optimize the capacities of components. The configurations, which meet the required supply reliability with the lowest cost, give the optimal choices. These calculations are carried out with hourly meteorological data and energy demand data of Okushiri Island. As a result, hybrid storage (battery and hydrogen) is the best choice for Okushiri Island when high supply reliability is required. In the range of loss of power supply probability 0.1 to 0, the levelized cost of energy will be about 70-150yen/kWh.