Abstract:

Power information systems are important for the operation of power systems. When part of the power information system fails, the loads will be redistributed. Due to network congestions, cascading failures may occur, and additional devices or sub-systems would fail. In this paper, power information system was abstracted to a complex network. The traditional load-capacity model was improved to satisfy the characteristics of power information systems. The improved model also reflects the distribution of power information system nodes. Moreover, two vulnerability indices were established from the perspective of both topological structure and network properties, and the vulnerability assessment process was proposed. Finally, cascading failure process and the impact of redundancy factor were analyzed in case study. The effectiveness and rationality of this method was verified by the results.

Key words: power information system, load-capacity model, vulnerability assessment, complex network, scale-free network