Power systems with high penetration of inverter-based resources (IBRs) are prone to sub-synchronous oscillations (SSO). The opaqueness of vendor-specific IBR models limits the ability to predict the severity and the spread of SSO. This paper demonstrates that black-box IBR models estimated through frequency-domain identification techniques, along with dynamic network model can replicate the actual oscillatory behavior. The estimated IBR models are validated against actual IBR models in a closed-loop multi-IBR test system through modal analysis by comparing closed-loop eigenvalues, and participation factors. Furthermore, using output-observable right eigenvectors, spatial heatmaps are developed to visualize the spread and severity of dominant SSO modes. The case studies on the 11-bus and 39-bus test systems confirm that even with the estimated IBR models, the regions susceptible to SSO can be identified in IBR-dominated power systems.
@article{arxiv.2603.15399,
title = {Spatial Characterization of Sub-Synchronous Oscillations Using Black-Box IBR Models},
author = {Muhammad Sharjeel Javaid and Gabriel Covarrubias Maureira and Ambuj Gupta and Debraj Bhattacharjee and Jianli Gao and Balarko Chaudhuri and Mark O'Malley},
journal= {arXiv preprint arXiv:2603.15399},
year = {2026}
}
Comments
Accepted for IEEE PES General Meeting 2026, Montreal