RESTART

Partners: ETHZ (FEN), Hitachi Energy, Swissgrid AG, Primeo Energie
Duration: 11/2023 - 04/2026
Funding: SFOE
Project Leader: ETHZ (FEN)
Project Team: Dr. Alexander Fuchs, Dr. Turhan Demiray

external page Dr. Mats Larsson @ Hitachi Energy Research

Questions surrounding future system during restoration:

• How do DRES affect active power balance (BESS, PV, EV, Heat pumps)?
• How do reversed power flows affect the reactive power balance and voltage level?
• Is the granularity of current restoration cells adequate?
• Can the current top-down restoration be complemented by a bottom-up restoration?
• What Stability challenges come from the active DRES (interactions, resonance)?
• What are required procedural changes? (switching sequences, automation)
• What are required technical changes and investments? (substation autonomy times, BESS, switching gear)
  
  

Transmission grid becomes increasingly vulnerable (frequency events, system separations, partial blackouts)
Challenges increase with a higher share of converter-based (distributed) generation (DRES), high transit flows.
Restoration comes into action, when preventive measures fail.
Research question: What are the novel restoration approaches for Swiss grids with a high share of renewables and converter technologies?

• Review current restoration practice and challenges.
• Participate / review ongoing exercises and practical experiences.
• Formulate quantitative case studies combining top-down and bottom-up approach.
• Three-part assessment: Steady state security, switching approach, transient/dynamic security during restoration.