Study of storage battery capacity required for Hakodate hydrogen supply chain using offshore and onshore wind power in southern Hokkaido

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  • 道南洋上・陸上風力発電を用いた函館水素サプライチェーンに要する蓄電池容量の検討

Abstract

<p>This study examines a system configuration for supplying electricity and heat to Hakodate City from offshore and onshore wind power in the southern Hokkaido region, which is planned to achieve carbon neutrality by 2050. In the proposed system, electricity output from offshore and onshore wind farms is transmitted to a substation near Hakodate via a transmission line. The transmitted power is matched to the power load at the substation and supplied through the transmission line. Surplus power generated during this process is stored in storage batteries and hydrogen. When the power supply is insufficient, the power from the storage batteries and hydrogen gas are used to stabilize the power supply using fuel cells. This system can provide more than 90 % of Hakodate's annual electricity and heat needs. However, it is important to reduce the storage battery capacity in order to reduce costs. As a result, we believe that reducing the storage battery capacity and increasing the hydrogen tank capacity by prioritizing the use of electricity stored in the storage batteries will result in a system with low costs and a high ratio of electricity and heat supply to Hakodate. The supply ratio exceeds 90% when the storage battery ratio is 10 % or more, and the maximum supply ratio is reached when the storage battery ratio is around 25 %.</p>

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