Understanding Power System Oscillation and Stability: A Waveform Perspective and 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.
Date and Time
Location
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Registration
- Date: 28 Apr 2025
- Time: 10:50 PM UTC to 12:30 AM UTC
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- Starts 27 March 2025 07:00 AM UTC
- Ends 29 April 2025 12:00 AM UTC
- No Admission Charge
Speakers
Wilsun Xu
Biography:
The speaker, Dr. Wilsun Xu, received Ph.D. from the University of British Columbia, Canada, in 1989. He worked at BC Hydro in Vancouver, Canada for seven years before joining the University of Alberta in Edmonton, Canada, in 1996, where he is currently a professor. Dr. Xu has been engaged in power quality research, education, and consulting for over 30 years, and he was elevated to IEEE Fellow for contributions to power system harmonics analysis in 2005. In recent years, Dr. Xu has been advocating for the application of waveform data to support equipment condition and system stability monitoring. This effort has helped to establish two PES Working Groups in the area. His research works on voltage flicker source location and harmonic resonance mode analysis have led to the findings shared in this webinar.
Email:
Address:Edmonton, Alberta, Canada
Agenda
4:00pm - Event Starts
4:45pm - Q&A
5:00pm - Adjourn
Times are in PST.