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Moving-Target Defense Against Cyber-Physical Attacks in Power Grids via Game Theory

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Document pages: 8 pages

Abstract: This work proposes a moving target defense (MTD) strategy to detectcoordinated cyber-physical attacks (CCPAs) against power grids. The main ideaof the proposed approach is to invalidate the knowledge that the attackers useto mask the effects of their physical attack by actively perturbing the grid stransmission line reactances via distributed flexible AC transmission system(D-FACTS) devices. The proposed MTD design consists of two parts. First, weidentify the subset of links for D-FACTS device deployment that enables thedefender to detect CCPAs against any link in the system. Then, in order tominimize the defense cost during the system s operational time, we formulate azero-sum game to identify the best subset of links to perturb (which willprovide adequate protection) against a strategic attacker. The Nash equilibriumrobust solution is computed via exponential weights, which does not requirecomplete knowledge of the game but only the observed payoff at each iteration.Extensive simulations performed using the MATPOWER simulator on IEEE bussystems verify the effectiveness of our approach in detecting CCPAs andreducing the operator s defense cost.

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