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<p>Recently, research on Dynamic Line Rating (DLR) has been increasingly conducted to secure transmission system capacity that has become insufficient due to the growth of renewable energy sources located far from demand centres. This paper proposes methodology for selecting transmission lines requiring DLR installation for economical operation and evaluating their economic value. The study identifies the most effective transmission lines for DLR application and applies the methodology to Korea's actual power system. Additionally, AC Optimal Power Flow is employed to evaluate accurate economic effects. This research explicitly addresses the limitations of DC Optimal Power Flow and emphasizes that AC Optimal Power Flow, which considers system voltage and reactive power, provides a more accurate evaluation methodology. Furthermore, since applying DLR to all transmission lines is economically inefficient, an effective method for selecting target lines is proposed. Through this approach, the congestion cost reduction of selected transmission lines is calculated, and the economic benefits of DLR are clearly defined. This study is expected to contribute to increasing the efficiency of power systems and reducing the complexity of transmission capacity management.</p>

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Line selection and economic evaluation of dynamic line rating based on AC optimal power flow

  • 期刊论文

  • 发表日期：

    2025年8月29日

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  • Hyeongseok Yun,
  • Hansol Shin,
  • Kyuhyeong Kwag,
  • Hyobin Oh,
  • Hyojeong Yoon,
  • Wook Kim,
  • Yoon Sung Cho,
  • Eun-Gyu Gu,
  • Hee In Chang

摘要

Recently, research on Dynamic Line Rating (DLR) has been increasingly conducted to secure transmission system capacity that has become insufficient due to the growth of renewable energy sources located far from demand centres. This paper proposes methodology for selecting transmission lines requiring DLR installation for economical operation and evaluating their economic value. The study identifies the most effective transmission lines for DLR application and applies the methodology to Korea's actual power system. Additionally, AC Optimal Power Flow is employed to evaluate accurate economic effects. This research explicitly addresses the limitations of DC Optimal Power Flow and emphasizes that AC Optimal Power Flow, which considers system voltage and reactive power, provides a more accurate evaluation methodology. Furthermore, since applying DLR to all transmission lines is economically inefficient, an effective method for selecting target lines is proposed. Through this approach, the congestion cost reduction of selected transmission lines is calculated, and the economic benefits of DLR are clearly defined. This study is expected to contribute to increasing the efficiency of power systems and reducing the complexity of transmission capacity management.