Title: Comparing Different Models for Investigating Cascading Failures in Power Systems,
Abstract: This paper centers on the comparison of three different models that describe
cascading failures of power systems. Specifically, these models are different
in characterizing the physical properties of power networks and computing the
branch power flow. Optimal control approach is applied on these models to
identify the critical disturbances that result in the worst-case cascading
failures of power networks. Then we compare these models by analyzing the
critical disturbances and cascading processes. Significantly, comparison
results on IEEE 9 bus system demonstrate that physical and electrical
properties of power networks play a crucial role in the evolution of cascading
failures, and it is necessary to take into account these properties
appropriately while applying the model in the analysis of cascading blackout.