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Cost Restrained Hybrid Attacks in Power Grids

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Document pages: 5 pages

Abstract: The frequent occurrences of cascading failures in power grids have beenreceiving continuous attention in recent years. An urgent task for us is tounderstand the cascading failure vulnerability of power grids against variouskinds of attacks. We consider a cost restrained hybrid attack problem in powergrids, in which both nodes and links are targeted with a limited total attackcost. We propose an attack centrality metric for a component (node or link)based on the consequence and cost of the removal of the component. Depending onthe width of cascading failures considered, the attack centrality can be alocal or global attack centrality. With the attack centrality, we furtherprovide a greedy hybrid attack, and an optimal hybrid attack with the ParticleSwarm Optimization (PSO) framework. Simulation results on IEEE bus test datashow that the optimal hybrid attack is more efficient than the greedy hybridattack. Furthermore, we find counterintuitively that the local centrality basedalgorithms are better than the global centrality based ones when the costconstraint is considered in the attack problem.

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