Rapid and Accurate Changepoint Detection of Power System Forced Oscillations
Abstract
This paper describes a new approach for using changepoint detection (CPD) to estimate the starting and stopping times of a forced oscillation (FO) in measured power system data. As with a previous application of CPD to this problem, the pruned exact linear time (PELT) algorithm is used. However, instead of allowing PELT to automatically tune its penalty parameter, a method of manually providing it is presented that dramatically reduces computation time without sacrificing accuracy. Additionally, the new algorithm requires fewer input parameters and provides a formal, data-driven approach to setting the minimum FO segment length to consider as troublesome for an electromechanical mode meter. A low-order ARMAX representation of the minniWECC model is used to test the approach, where a 98\% reduction in computation time is enjoyed with high estimation accuracy.
Keywords
Cite
@article{arxiv.2511.15812,
title = {Rapid and Accurate Changepoint Detection of Power System Forced Oscillations},
author = {Luke Dosiek and Akaash Karn and Frank Liu},
journal= {arXiv preprint arXiv:2511.15812},
year = {2026}
}
Comments
Currently under revise and resubmit process for the proceedings of the 2026 IEEE Power and Energy Society General Meeting (PESGM26)