  For critical infrastructure restoration planning, the real-time scheduling
and coordination of system restoration efforts, the key in decision-making is
to prioritize those critical components that are out of service during the
restoration. For this purpose, there is a need for component importance
analysis. While it has been investigated extensively for individual systems,
component importance considering interdependence among transmission,
distribution and communication (T&D&C) systems has not been systematically
analyzed and widely adopted. In this study, we propose a component importance
assessment method in the context of interdependence between T&D&C networks.
Analytic methods for multilayer networks and a set of metrics have been applied
for assessing the component importance and interdependence between T&D&C
networks based on their physical characteristics. The proposed methodology is
further validated with integrated synthetic Illinois regional transmission,
distribution, and communication (T&D&C) systems, the results reveal the unique
characteristics of component/node importance, which may be strongly affected by
the network topology and cross-domain node mapping.
