Modeling interconnected ICT and power systems for resilience analysis

Abstract

Increasing interdependencies between power and ICT systems amplify the possibility of cascading failures. Resilience against such failures is an essential property of modern and sustainable power systems and networks. To assess the resilience and predict the behaviour of a system consisting of interdependent subsystems, the interconnection requires adequate modeling. This work presents an approach to model and determine the state of these so-called interconnectors in future cyber-physical energy systems with strongly coupled ICT and power systems for a resilience analysis. The approach can be used to capture the impact of various parameters on system performance upon suitable modification. An hierarchical modeling approach is developed with atomic models that demonstrate the interdependencies between a power and ICT system. The modeling approach using stochastic activity nets is applied to an exemplary redispatch process in a cyber-physical energy system. The performance of an interconnector when facing limited performance from the ICT subsystem and its subsequent impact on the power system is analysed using the models. The state of the interconnector, as well as the service level are mapped to a resilience state-space diagram. The representation of system state on the resilience state-space diagram allows interpretation of system performance and quantification of resilience metrics.

Cross-boundary risks of hinterland hazards to city infrastructure

“…It can be difficult to locate communication assets due to security concerns and their private nature (Burrington 2016), making it difficult understand the exact pathways through which damage to hinterland communication assets has impacted urban communication function. It appears that the most significant risk to urban communication infrastructure function is an electricity outage, due to the strong dependency on electricity infrastructure (Zimmerman and Faris 2010, Tøndel et al 2018, Anderson et al 2020, Patil et al 2020.…”

Methods for Analysis and Quantification of Power System Resilience

“…2): Cascading is the successive propagation of outages in the grid to a wider region beyond the initial outages. This may include cascading via interdependencies with other infrastructures such as ICT [20]. In rare cases, but which are also cases of substantial risk, a substantial portion of the interconnection is blacked out by cascading.…”