Impact of inner control in GFM-induced sub-synchronous oscillations
File(s)
Author(s)
Javaid, Muhammad Sharjeel
Chaudhuri, Balarko
Teng, fei
Akhtar, zohaib
Type
Conference Paper
Abstract
In power systems dominated by grid-forming inverters (GFMs), strong grid conditions can lead to sub-synchronous oscillations (SSOs) due to the reduced time-scale separation between GFM control loops and network dynamics, potentially causing instability. Modal analysis reveals that states associated with inner control (comprising current and voltage control loops) and network dynamics are the primary contributors to these oscillatory modes. This paper provides an analytical explanation of adverse interactions between GFM inner control and network dynamics that lead to SSOs. Through damping ratio sensitivity analysis, we establish that increasing the current control closed-loop bandwidth and the voltage control proportional gain can effectively mitigate these oscillations. The proposed control adjustments also prove effective in larger systems with 100% inverter-based resources penetration, comprising of a mix of both grid-following and grid-forming inverters.
Date Issued
2025-08-31
Date Acceptance
2025-03-14
Citation
2025 IEEE Power & Energy Society General Meeting (PESGM), 2025
Publisher
IEEE
Journal / Book Title
2025 IEEE Power & Energy Society General Meeting (PESGM)
Copyright Statement
Copyright © 2025 IEEE. This is the author’s accepted manuscript made available under a CC-BY licence in accordance with Imperial’s Research Publications Open Access policy (www.imperial.ac.uk/oa-policy)
License URL
Source
2025 IEEE PES General Meeting
Place of Publication
Austin, TX, USA
Publication Status
Published
Start Date
2025-07-27
Finish Date
2025-07-31
Coverage Spatial
Austin, TX, USA
Date Publish Online
2025-11-10