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<p>In order to mitigate the intermittency and fluctuation of renewable energy output and to fully exploit the regulatory potential of long-duration hydrogen storage in its production, storage, and utilization, this study proposes an innovative hybrid system that integrates a solid oxide electrolysis cell (SOEC), a solid oxide fuel cell (SOFC), a supercritical CO<sub>2</sub> cycle (S-CO<sub>2</sub>), and an organic Rankine cycle (ORC). This integrated configuration provides a comprehensive solution for electricity generation, energy storage, and peak load regulation. By optimizing the hourly scheduling of wind and solar power outputs throughout the year, a power system of appropriate scale is configured to maximize annual net revenue. During peak wind and photovoltaic generation periods, surplus electricity is converted into chemical energy and stored in hydrogen tanks; when electricity supply is insufficient, the stored hydrogen is released to drive subsequent power generation units. One unit of the proposed system is capable of delivering 19.44 MW of electricity, attaining an energy efficiency of 35.33% and an exergy efficiency of 35.66%. After optimization using a mixed-integer linear programming (MILP) algorithm, the results indicate that three integrated power generation units and a hydrogen storage capacity of 116.20 t are required, achieving a total annual revenue of up to 8.94×10<sup>8</sup> USD and a payback period of 11.2 years. The findings confirm that the proposed system is both technically feasible and economically viable when operating with renewable energy inputs.</p>

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Performance Assessment and Operation Optimization of a Green Hydrogen and Electricity Cogeneration System Based on Renewable Energy via SOEC and SOFC

  • 期刊论文

  • 发表日期：

    2026年7月21日

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  • Yi’nan Wang,
  • Heng Chen,
  • Hongnan Yu,
  • Hongxu Zheng,
  • Xinyu Wang,
  • Peiyuan Pan,
  • Gang Xu

摘要

In order to mitigate the intermittency and fluctuation of renewable energy output and to fully exploit the regulatory potential of long-duration hydrogen storage in its production, storage, and utilization, this study proposes an innovative hybrid system that integrates a solid oxide electrolysis cell (SOEC), a solid oxide fuel cell (SOFC), a supercritical CO2 cycle (S-CO2), and an organic Rankine cycle (ORC). This integrated configuration provides a comprehensive solution for electricity generation, energy storage, and peak load regulation. By optimizing the hourly scheduling of wind and solar power outputs throughout the year, a power system of appropriate scale is configured to maximize annual net revenue. During peak wind and photovoltaic generation periods, surplus electricity is converted into chemical energy and stored in hydrogen tanks; when electricity supply is insufficient, the stored hydrogen is released to drive subsequent power generation units. One unit of the proposed system is capable of delivering 19.44 MW of electricity, attaining an energy efficiency of 35.33% and an exergy efficiency of 35.66%. After optimization using a mixed-integer linear programming (MILP) algorithm, the results indicate that three integrated power generation units and a hydrogen storage capacity of 116.20 t are required, achieving a total annual revenue of up to 8.94×108 USD and a payback period of 11.2 years. The findings confirm that the proposed system is both technically feasible and economically viable when operating with renewable energy inputs.