@inproceedings{09bf5c95534446a59a1af1810d66a45d,
title = "A Hybrid Koopman Approach for Stability Analysis of DC Microgrids with Constant Power Loads",
abstract = "This paper presents a Koopman Hybrid System Identification Method (KHSIM) for estimating the Region of Attraction (ROA) in DC microgrids with constant power loads (CPLs). Unlike small-signal methods, KHSIM directly addresses large-signal stability. This is achieved by constructing Lyapunov functions from Koopman eigenfunctions and applying Sum of Squares (SOS) optimization. To validate the approach, offline trajectory data was collected from a Hardware-in-the-Loop (HIL) platform with a DSP-controlled CPL emulator. The results show that KHSIM produces ROA estimates that closely match observed stability boundaries and are significantly less conservative than traditional SOS methods. These findings confirm that the proposed method is compatible with practical experimental data, offering a computationally feasible tool for stability assessment in microgrid applications.",
keywords = "Constant Power Loads, DC Microgids, EV, Koopman Operator, More Electric Aircraft, Region of Attraction, Sum of Squares, System Identification",
author = "Patrick Johnson and Sarbajit Basu and Luis Herrera",
note = "Publisher Copyright: {\textcopyright} 2026 IEEE.; 2026 IEEE Transportation Electrification Conference and Expo and Electric Aircraft Technologies Symposium, ITEC+EATS 2026 ; Conference date: 10-06-2026 Through 12-06-2026",
year = "2026",
doi = "10.1109/ITECEATS66641.2026.11592896",
language = "English",
series = "2026 IEEE Transportation Electrification Conference and Expo and Electric Aircraft Technologies Symposium, ITEC+EATS 2026",
publisher = "Institute of Electrical and Electronics Engineers Inc.",
booktitle = "2026 IEEE Transportation Electrification Conference and Expo and Electric Aircraft Technologies Symposium, ITEC+EATS 2026",
address = "United States",
}