In this paper, we examine the impact of cyberattacks in an integrated
transmission and distribution(T&D) power grid model with distributed energy
resource (DER) integration. We adopt the OCTAVE Allegro methodology to identify
critical system assets, enumerate potential threats, analyze, and prioritize
risks for threat scenarios. Based on the analysis, attack strategies and
exploitation scenarios are identified which could lead to system compromise.
Specifically, we investigate the impact of data integrity attacks in
inverted-based solar PV controllers, control signal blocking attacks in
protective switches and breakers, and coordinated monitoring and switching
time-delay attacks.

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