Power System Oscillation & Stability: A Waveform Perspective & Its Practical Applications

Power system oscillation is a significant stability concern for utility companies, especially with the increased interconnection of inverter-based resources (IBRs). Traditionally, oscillations are investigated using phasor data. This presentation approaches the problem by examining the actual voltage and current waveforms underlying the phasors. It is found that oscillations are the appearance of beating waveforms in the phasor form. The beating waveforms, in turn, are caused by interharmonics (defined per IEC 61000-4-30). Notably, it can be proven that the presence of interharmonics is both a necessary and sufficient condition for phasor oscillations, and synchronous generator oscillations can be easily explained using interharmonics. Multiple field measurement results will be used to substantiate these findings. The interharmonic insights could lead to many innovative applications. Two of them will be shared here. The first one is to locate oscillation sources using measurement data. The second one is to determine generator participation factors based on small-signal power system dynamic models.
Speaker(s): Wilsun Xu
Agenda:
4:00pm – Event Starts
4:45pm – Q&A
5:00pm – Adjourn
Times are in PST.
Virtual: https://events.vtools.ieee.org/m/477906