著者

松原 雅 吉岡 剛 松橋 隆治

出版者

一般社団法人 エネルギー・資源学会

雑誌

エネルギー・資源学会論文誌 (ISSN:24330531)

巻号頁・発行日

vol.43, no.6, pp.235-244, 2022-11-10 (Released:2022-11-10)

参考文献数

23

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Power retail companies have the risk of paying the penalty due to the imbalance between planned and actual power generation values. And the risk is supposed to increase in the future. Batteries and electrolyzers are a possible solution to reduce the imbalance. To mitigate the high installation cost of electrolyzers, it is important to increase the capacity factor of electrolyzers. In this study, a mathematical model was developed to simulate the operation of a power retail company using a battery and an electrolyzer. Then we proposed a new strategy to produce hydrogen using electricity from JEPX, when the wholesale electricity price is lower than a certain value. The model was formulated as a mixed integer linear programming problem, and the effect of the strategy was evaluated by solving this problem. As a result, this strategy achieved high capacity factor of the electrolyzer, around 60%. In order to reduce the risk of JEPX price fluctuation, we also proposed an electrolyzer’s operation strategy using the prediction error distribution of JEPX price. The effect was quantified through Monte-Carlo simulation. Although the deviation of the yearly revenue was not much reduced by this strategy, the high deviation was notably reduced in the daily revenue.

著者

松橋 隆治 石谷 久 菅 幹雄 吉岡 完治

出版者

一般社団法人 日本エネルギー学会

雑誌

日本エネルギー学会誌 (ISSN:09168753)

巻号頁・発行日

vol.77, no.12, pp.1184-1192, 1998-12-20 (Released:2010-06-28)

参考文献数

5

被引用文献数

1 2

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Life cycle assessment (LCA) is expected to be a useful measure for us to evaluate environmental impacts associated with products or processes, so that we could improve our production systems for sustainable development. For this purpose, we have developed a novel mathematical tool called Process-relational Model. In the model, we have improved the principle of input-output analysis so as to include joint production. This improvement has enabled us to overcome difficulties of LCA in retracing complicated repercussions among production systems and in allocating environmental emissions among multiple products.Then life cycle CO2 emissions of electric and gasoline vehicles have been estimated with this model. We have shown that production and driving of electric vehicles cause less CO2 emissions than those of gasoline vehicles. Our analysis has also indicated that the difference detween electric and gasoline vehicles dramatically changes depending on traffic situation. Namely the difference becomes larger, as average velocity of vehicles becomes lower. Concerning electric vehicles, we have compared CO2 emissions caused by production with those caused by driving. The share of production has increased, as average velocity becomes higher.In conclusion, we have clarified directions of research and development of electric and gasoline vehicles for sustainable energy system.

著者

河野 孝史 松橋 隆治 吉田 好邦 浅野 浩志

出版者

一般社団法人 日本エネルギー学会

雑誌

日本エネルギー学会誌 (ISSN:09168753)

巻号頁・発行日

vol.89, no.2, pp.150-156, 2010 (Released:2010-03-11)

参考文献数

11

被引用文献数

1

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The acceleration of diffusion of the DER (distributed energy resources) is hoped for because of the promotion for highly effective use of energy, especially in the house and commercial section in Japan. From this point of view, it is necessary to focus on the feature of DER such as intermittent renewable resources, low quality and low density. The purpose of our study is to clarify the demand of multi (involved low) quality energy and to solve the problem which is optimization of the energy network supply system whose alternative is DER system and large power grid. For these reasons, in this paper, we drew up and sent out questionnaires and analyzed them by CVM. After we evaluated the potential of the multi-quality energy supplying system, we concluded that low energy quality have enough possibility to supply for some of the home appliance.

著者

松橋 隆治 吉田 好邦 石谷 久

出版者

一般社団法人 電気学会

雑誌

電気学会論文誌C(電子・情報・システム部門誌) (ISSN:03854221)

巻号頁・発行日

vol.122, no.11, pp.1976-1985, 2002-11-01 (Released:2008-12-19)

参考文献数

9

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In this article, we investigated possibility to establish a recycling-based industrial system in Japan. For this purpose, a novel mathematical model was first developed for the recycling-based system by expanding input-output analysis. Utilizing this model, we clarified several significant implications on the possibility of the recycling-based system and the prices of recycled goods. Then various recycling technologies were evaluated to clarify how these technologies could contribute to establish the system as well as to mitigate global warming. Next we developed an optimization model of the entire industrial systems in Japan, including conventional and emerging technologies on waste disposal and recycling. Various institutions on the recycling system were investigated utilizing this model. These include prices of recycled goods and tradeoff relationships between promotion of recycling and reduction of CO2 emissions. In particular, evaluated results showed that shadow price of recycled goods did not necessarily become positive. We also proposed a novel institution on the recycling system as “Waste dumping permit” in Japan. In conclusion, we clarified a desirable strategy so as to establish the recycling-based system, as well as to mitigate global warming.