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 pageDr. 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.