Impact and modeling of topological action among sub-transmission grid units

The rise in renewable energy sources, storage, and flexibility means decentralizes power injection among the grid, and new congestions occur on the sub-transmission grid (60 to 150 kV, just below the extra-high voltage). It becomes pertinent to include, in EHV grid models for power flow studies, some of the sub-transmission units. However, congestions appearing on a static representation of the sub-transmission could in reality be solved with topological actions and shall not lead to curtailment. Moreover, the operation plan remains unknown when working with open data. This article analyses the impact of 1-move topological actions, and proposes a methodology to model sub-transmission with its incertitude on operation plan and potential 1-move topological actions.