Small-signal stability monitoring using PMU

The paper presents results of the research devoted to PMU-based power system small-signal stability monitoring. Proposed method allows tracking in-phase groups of generators and critical generators in the groups by analyzing low-frequency oscillations. Further developed, method is able to identify proximity to power system stability boundary. The technique developed is based on power system equivalent model identification. Identification procedure exploits PMU data. In the paper, applicability of the technique is demonstrated using 9-node power system model.