With an increase in the oscillation events observed in the U.S. Eastern
Interconnection (EI), it has become increasingly important to have a
good understanding of the EI system oscillatory behavior. However, as
compared to the Western Interconnection system (WI), not much work has
been done in this regard for the EI system. Therefore, in this paper, a
thorough analysis is carried out to identify inter-area modes and their
properties for the EI system using a 80000+ bus real EI model.
Multi-channel Prony method is used in this paper for estimating system
modes and mode-shapes.