11 papers
Cluster-Based Distributed Small-Signal Stability Certificates for Grid-Forming Inverter Networks
Bhathiya Rathnayake, Sijia Geng
Large-scale power networks are often organized by geography, ownership, or control authority, making stability certificates that require a fully assembled global model challenging.…
Decentralized Stability Certificates in IBR-Dominated Grids: The Role of the Network State
Zhimeng Wang, Sushobhan Chatterjee, Sijia Geng +2
Small-signal instabilities, such as unforced sub-synchronous oscillations (SSOs), are increasingly observed in inverter-based resource (IBR) dominated grids. While decentralized st…
Decentralized Stability-Constrained Optimal Power Flow for Inverter-Based Power Systems
Shigeng Wang, Sijia Geng
Future inverter-dominated power systems feature higher variability and more stressed operating conditions, which motivates the consideration of stability in operational settings. E…
Data-Driven Koopman Predictive Control for Frequency Regulation of Power Systems using Black-Box IBRs
Sohrab Rezaei, Xiaomo Wang, Sijia Geng
Model uncertainty of inverter-based resources (IBRs) presents significant challenges for power system control and stability. This work studies secondary frequency regulation in inv…
Evaluating Power Flow Manifold from Local Data around a Single Operating Point via Geodesics
Qirui Zheng, Dan Wu, Franz-Erich Wolter +1
The widespread adoption of renewable energy poses a challenge in maintaining a feasible operating point in highly variable scenarios. This paper demonstrates that, within a feasibl…
Grid-Forming Control with Assignable Voltage Regulation Guarantees and Safety-Critical Current Limiting
Bhathiya Rathnayake, Sijia Geng
This paper develops a nonlinear grid-forming (GFM) controller with provable voltage-formation guarantees, with over-current limiting enforced via a control-barrier-function (CBF)-b…
Assessment of Power System Stability Considering Multiple Time-Scale Dynamics: Insights into Hopf Bifurcations in Presence of GFL and GFM IBRs
Luis David Pabon Ospina, Martin Braun, Sushobhan Chatterjee +1
Real power systems exhibit dynamics that evolve across a wide range of time scales, from very fast to very slow phenomena. Historically, incorporating these wide-ranging dynamics i…
Voltage Stability of Inverter-Based Systems: Impact of Parameters and Irrelevance of Line Dynamics
Sushobhan Chatterjee, Sijia Geng
This paper investigates voltage stability in inverter-based power systems concerning fold and saddle-node bifurcations. An analytical expression is derived for the sensitivity of t…
Large-Signal Stability of Power Systems with Mixtures of GFL, GFM and GSP Inverters
Yifan Zhang, Yaoxin Wang, Yunjie Gu +5
Grid-following (GFL) inverters have very different large-signal stability characteristics to synchronous generators, and convenient concepts such as the equal-area criterion and gl…
Effects of Line Dynamics on Stability Margin to Hopf Bifurcation in Grid-Forming Inverters
Sushobhan Chatterjee, Sijia Geng
This paper studies the parameter sensitivity of grid-forming inverters to Hopf bifurcations to address oscillatory instability. An analytical expression for the sensitivity of the…
Unified Control Scheme for Optimal Allocation of GFM and GFL Inverters in Power Networks
Sushobhan Chatterjee, Sijia Geng
With the rapid adoption of emerging inverter-based resources, it is crucial to understand their dynamic interactions across the network and ensure stability. This paper proposes a…