open access

https://doi.org/10.14943/doctoral.k16020

https://hdl.handle.net/2115/93898

Integration of CO2-free Hydrogen and Next Generation Power Network to Achieve a Decarbonized Society

日本語

Energy shift

2024-03-25

Hokkaido University

141p.

Decarbonization is the focus of global attention in the context of global warming. In the future, not only coal-fired power generation but also natural gas-fired power generation is expected to be phased out. Renewable energy sources (RES), including PV and wind power, are expected to replace these sources. There are many challenges to making RES the main power source in the power system. In this research, the temporal and spatial mismatch between RES output and demand is focused on. Therefore, energy shifting by storage is attracting attention. Batteries are beginning to be used in general. The advantages of batteries are that they can be recharged, discharged, and stored by themselves and that they have high charge/discharge efficiency. However, storage batteries are not suitable for long-term energy storage due to their difficulty in increasing capacity and self-discharge. Hydrogen energy has been attracting attention in recent years. Hydrogen can be produced by electrolysis of water using RES-derived electricity (CO2-free hydrogen), does not emit greenhouse gases during power generation, and can be stored for long term. In addition, two forms of power networks are focused on to solve the supply-demand mismatch. The first is the microgrid (MG), which refers to a small-scale grid that meets the demand for electricity, heat, etc. by using RES and controllable power sources within a certain demand area. By balancing supply and demand in certain areas of the grid, the impact on the power system may be reduced. The second is a Cross-regional interconnection system, which aims to secure a stable supply of power by interconnecting multiple areas and securing power sources and balancing power across the areas. In this paper, the effect of integrating a next-generation power network and CO2-free hydrogen on the stable supply of electricity is evaluated. First, the effect of installing hydrogen facilities in a microgrid is verified. Next, an operational methodology is proposed for a real microgrid with hydrogen facilities. Finally, a model is developed to evaluate the power generation mix in Japan, and the effect of including hydrogen facilities in the cross-regional interconnection system is evaluated.

2024-03-25

甲第16020号

博士(情報科学)

(主査) 准教授 原 亮一, 教授 五十嵐 一, 教授 北 裕幸, 教授 林 泰弘 (早稲田大学・理工学術院)

情報科学院(情報科学専攻)

博士論文

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