Event Signatures in H-PMU Measurements: An Information-Theoretic Analysis of Real-World Data.

A harmonic phasor measurement unit (H-PMU) is a technological evolution of the conventional PMU. Unlike a conventional PMU that solely captures fundamental phasors, an H-PMU encompasses the measurements of both fundamental and harmonic phasors. So far, the application of H-PMU measurements has been on the analysis of steady-state characteristics of harmonic phasors, such as for harmonic source identification or harmonic state estimation. However, in this paper, we take a rather unique and multi-disciplinary approach to harness the additional information provided by harmonic phasor signatures to better analyze power system events. The proposed approach is data-driven and from the view point of information theory, and based on real-world H-PMU measurements. Our analysis reveals the presence of significant independent information content in the extracted features from the event signatures in harmonic phasor measurements. This study also explores the applications of utilizing such additional information content, such as to optimally select the orders of the harmonic phasors for the analysis of power system events, as well as to enhance the performance in the task of event clustering in power systems situational awareness.