Low-Resolution Fault Localization Using Phasor Measurement Units with Community Detection
For power system operators, this provides a method to localize faults with limited PMU data, but the approach is incremental and domain-specific.
The paper investigates fault localization using PMUs when the system is unobservable due to low measurement density, showing that faults can be localized at the sub-graph level rather than individual lines, with resolution tied to graph clustering.
A significant portion of the literature on fault localization assumes (more or less explicitly) that there are sufficient reliable measurements to guarantee that the system is observable. While several heuristics exist to break the observability barrier, they mostly rely on recognizing spatio-temporal patterns, without giving insights on how the performance are tied with the system features and the sensor deployment. In this paper, we try to fill this gap and investigate the limitations and performance limits of fault localization using Phasor Measurement Units (PMUs), in the low measurements regime, i.e., when the system is unobservable with the measurements available. Our main contribution is to show how one can leverage the scarce measurements to localize different type of distribution line faults (three-phase, single-phase to ground, ...) at the level of sub-graph, rather than with the resolution of a line. We show that the resolution we obtain is strongly tied with the graph clustering notion in network science.