What question did this study set out to answer?

This research aims to investigate the dynamic behavior of power systems before a blackout event.

March 6, 2026IET conference proceedings.0 citations

Analysis of the power system oscillations before the blackout in Spain and Portugal on April 28, 2025

LCLijun CaiUniversity of Rostock TVTobias VeithRottenburg University of Applied Forest Sciences YHYanjin HouShandong Academy of Sciences

Key Points

This research aims to investigate the dynamic behavior of power systems before a blackout event.
Analyzed local and inter-area oscillations in power grids.
Assessed tie-line stress conditions prior to the blackout.
Evaluated post-blackout generation strategies in Spain.
Identified stable operation of renewable generation post-blackout.
Highlighted the critical role of grid-forming control in system stability.
Recommended implementing power system stabilizers for renewables and improved blackstart planning.

Abstract

On April 28, 2025, the Spanish and Portuguese power grids disconnected from continental Europe. This paper analyzes the system's dynamic behavior before the event: local and inter-area oscillations, tie-line stress, and examines Spain’s post-blackout generation strategy. The findings reveal the stable operation of renewable generations after the blackout and the importance of the grid-forming control. Recommendations include power system stabilitzer (PSS) for renewable generations and enhanced blackstart planning.

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