Abstract
Cascading outages of power systems pose great threats
to system security and reliability, potentially leading to large-scale
blackouts. For analysis and mitigation of cascading outages, this
paper proposes a transient stability-incorporated interaction
graph. This graph statistically quantifies the interactions among
line outages and instabilities of generators, which can model
propagation paths and patterns of cascading outages. Compared
with an interaction graph that only models line outages, this new
interaction graph provides important insights on how transient
instability occurs along with cascading outages. It also offers more
effective strategies for mitigating outage propagation. The
proposed interaction graph can be constructed from datasets of
historical or simulated cascading events. It is demonstrated on an
NPCC 140-bus system with mitigation strategies.
