The secure operation of large-scale power systems relies on adherence to pre-established section limits. However, the calculation of section limits is dependent heavily on expert experience, leading to significant individual variability and subjectivity in the resulting operational control strategies. To address this issue, this paper proposes a knowledge graph-based approach for section limit calculation. First, based on the mathematical models and calculation principles of section limits, a standardized calculation procedure is established by formalizing the logical relationships among computational tasks and physical entities. Secondly, a hierarchical knowledge graph construction method is proposed. This method decomposes the computational process into a process-layer knowledge graph and stage-layer sub-knowledge graphs, thereby enabling automated execution of each task through event ontology design and rule-based reasoning. Finally, case studies based on the IEEE 39-bus system and a practical power grid demonstrate that the proposed method can achieve standardized calculation of section limits. The computational accuracy and efficiency meet the requirements for engineering applications.
Fang et al. (Thu,) studied this question.