Reactive Characteristics in Subsystem-Level Small-Signal Stability Analysis of Multi-Converter Systems
Journal article, 2026
This paper investigates the impact of converters' reactive characteristics on small-signal stability assessment in multi-converter systems. A reactivity index is defined and introduced as a complementary measure to the passivity index, which forms the basis of subsystem-level stability analysis. Passivity theory alone may be insufficient to fully assess instability risks in such systems. In particular, the reactive characteristics of the converters and the connecting grid are used to identify system resonances, while active characteristics (passivity) indicate the potential for destabilization of those resonances. Theoretical findings are validated through time-domain simulations.
resonance interactions
Passivity
Damping
Admittance
STATCOM
Frequency
Grid forming
Stability
Indexing
Converters
reactive characteristics
Modeling
small-signal stability
Indexes
Author
Amir Zamani Babgohari
Chalmers, Electrical Engineering, Electric Power Engineering
Massimo Bongiorno
Chalmers, Electrical Engineering, Electric Power Engineering
Mebtu Bihonegn Beza
Chalmers, Electrical Engineering, Electric Power Engineering
Jan R. Svensson
Hitachi
Anant Narula
Chalmers, Electrical Engineering, Electric Power Engineering
IEEE Access
2169-3536 (ISSN) 21693536 (eISSN)
Vol. 14 122018-122028Subject Categories (SSIF 2025)
Other Electrical Engineering, Electronic Engineering, Information Engineering
DOI
10.1109/ACCESS.2026.3722383