Abstract
Cascading failures are among main reasons for large-scale blackouts, which degrade the robustness of power grids. A general setting in previous study on cascading failures is that all nodes have the same proportion of redundant capacity. However, due to different roles of nodes, this setting is usually inconsistent with the practical cases. Therefore, in this paper, we consider the power grids in which the nodes are categorized into the generation nodes and consumer nodes, and study how the robustness of power grids is affected by capacity redundancy disparity between these two kinds of nodes. A comprehensive model is used which considers both the network structure and electrical characteristics of power grids. The simulations on both realistic power networks and theoretical complex network model show that the generation nodes play a more important role during the cascading failure process and it is better to assign them more capacity redundancy than consumer nodes. This work advances our understanding on the roles of different kinds of nodes in power grids.
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