Evaluating the resilience of cyber–physical​ power systems by weighted spectral analysis

Abstract

With the development of the Internet of Things, the interdependency between the physical system and the cyber system becomes intense and improves operational efficiency. But the interdependency also increases the risk of failure propagation. The resilience of the cyber–physical system is important for security facing extreme events. Based on complex network theory, a weighted multiplex network model is proposed to realize the unified modeling of the power system and communication system. In addition, the cascading failure mechanism in the cyber–physical power system is built based on power dispatch and information transmission mechanisms in the actual scenario. Then, spectral metrics are introduced to evaluate structural resilience from a global perspective. Finally, simulations of cascading failure are performed to verify the effectiveness of spectral metrics on resilience evaluation. The proposed model and metrics provide a convenient approach to quantifying the resilience of an interdependent system. The results of resilience evaluation can be used as a reference for system structure planning.

Keywords

• Complex network
• Resilience
• Spectral metric
• Cyber–physical power system