13 papers
Revisiting The PBH Test: Fast Uncontrollability Certificates via Krylov Methods
Ahmad F. Taha, Mohamad H. Kazma, Abdallah A. Albustami
This letter revisits the classical PBH test through the lens of finite-horizon reachability. By casting state transfer as a minimum energy, primal optimization problem, we show tha…
The Iberian Blackout: A Black Swan or a Gray Rhino? A Protection-Aware Dynamic Voltage Security Assessment
Abdallah Alalem Albustami, Ahmad F. Taha
On 28 April 2025, the Iberian mainland power system collapsed after a rapid voltage rise, widespread generation disconnections, and loss of synchronism. The ENTSO-E Expert Panel fi…
Power System CBFs
Abdallah Alalem B. Albustami, Ahmad F. Taha, Taylor T. Johnson
Control barrier functions (CBFs) have become a standard tool in safety critical-control systems. CBFs convert state constraints into real time control conditions that certify forwa…
Modeling Spectral Energy Shifts in Spatio-Temporal Graph Anomaly Detection
Yilin Liu, Hongchao Zhang, Taylor T. Johnson +2
Graph anomaly detection methods aim to distinguish anomalous nodes. While prior methods characterize anomalies through increased variation in the spectral energy distributions, the…
Nonsmooth Hydraulics, Smooth Control: System Theory Framework for Analyzing Water Networks
Ahmad F. Taha, Mohamad H. Kazma
This paper presents a comprehensive control-theoretic analysis of water distribution network (WDN) hydraulics. Starting from a general nonlinear differential algebraic equation (DA…
DAE-Aware Bayesian Inference for Joint Generator-Network Parameter Estimation
Abdallah Alalem Albustami, Ahmad F. Taha, Sankaran Mahadevan
This paper addresses the classic problem of parameter estimation (PE) in multimachine power system models. Such models are typically described by a set of nonlinear differential-al…