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<p>Jeju Island is increasingly transitioning toward a renewable-rich power system under strong policy support. However, this transition is expected to intensify operational challenges, including frequent energy imbalances, reduced inertia, and weakened system strength, thereby requiring effective mitigation measures. While previous studies have examined strategies to address these issues, limited attention has been given to determining the optimal storage capacity from the perspective of total system investment and operating costs. To fill this gap, this study proposes a framework for optimal storage sizing that considers multiple operational scenarios for HVDC and must-run generators. Using policy targets and real-world data for Jeju Island, the proposed framework is used to estimate the required storage capacity. The results indicate that, under the baseline scenario, the required storage capacity increases from 410 MWh (50&#xa0;MW) in 2030 to 4,372 MWh (301&#xa0;MW) in 2038, while storage needs gradually evolve from short-cycle balancing toward multi-hour and multi-day energy shifting. In addition, enhanced HVDC capability and relaxed must-run requirements are shown to reduce the required storage capacity, helping mitigate the risk of excessive investment in storage.</p>

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Optimal Storage Sizing for Jeju Island Under Multiple Operational Scenarios

  • 期刊论文

  • 发表日期：

    2026年6月30日

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  • Eo Jin Choi,
  • Ji Woo Lee,
  • Hee Seung Moon,
  • Seung Wan Kim

摘要

Jeju Island is increasingly transitioning toward a renewable-rich power system under strong policy support. However, this transition is expected to intensify operational challenges, including frequent energy imbalances, reduced inertia, and weakened system strength, thereby requiring effective mitigation measures. While previous studies have examined strategies to address these issues, limited attention has been given to determining the optimal storage capacity from the perspective of total system investment and operating costs. To fill this gap, this study proposes a framework for optimal storage sizing that considers multiple operational scenarios for HVDC and must-run generators. Using policy targets and real-world data for Jeju Island, the proposed framework is used to estimate the required storage capacity. The results indicate that, under the baseline scenario, the required storage capacity increases from 410 MWh (50 MW) in 2030 to 4,372 MWh (301 MW) in 2038, while storage needs gradually evolve from short-cycle balancing toward multi-hour and multi-day energy shifting. In addition, enhanced HVDC capability and relaxed must-run requirements are shown to reduce the required storage capacity, helping mitigate the risk of excessive investment in storage.