ElCom Transmission security study
- FEN performed two security studies for ElCom for selected network security issues.
- Identification of critical contingencies and effective countermeasures
- Assessment of available network capacities for import and transit power
- Security evaluation of scenarios for network upgrades, available redispatch capacity and voltage support
- Investigation of redispatch, transformer control, generator control and reactive power compensation as countermeasures
- Simulations and N-1 security analysis with realistic model, validated with Swissgrid's operational model.
- Security studies for ElCom in the context of current transitions of the Swiss electricity grid:
- Low hydro capaciy during Winter and high transit flows ("Winterreserve")
- Impact of decomissioning nuclear power plant Mühleberg on network security in view of different network upgrades and topology changes
- Validate AC power flow model (voltages, line loads and cross border flows) for selected contingency scenarios
- Model control variables and select optimal values using SCOPF (Figure 1)
- Identify critical congestions and run iterative SCOPF to assess effectiveness of different countermeasures for security of critical network scenarios
- Validate new N-1 security of the SCOPF-result (Figure 2)
Illustration of the SCOPF (Security-Constrained OPF) over multiple time steps: Each time step (columns) and contingency (rows with red highlighting) uses a full network model. The models can be coupled by rate constraints (horizontal arrows).
Example result of the SCOPF-optimization, validated with an N-1 optimization for different contingencies (horizontal axis) and corresponding branch loading level (vertical axis).