Abstract
As a promising method with excellent characteristics in terms of resilience and dependability, distributed methods are gradually used in the field of energy management of microgrid. However, these methods have more stringent requirements on the working conditions, which will make the system more sensitive to communication failures and cyberattacks. As a result, it is both theoretical merits and practical values to investigate the malicious effect of cyber attacks on microgrid. This paper studies the distributed economic dispatch problem (EDP) under denial-of-service (DoS) attacks for the microgrid, in which each generator can communicate with its neighbors and has the computational capability to implement local operation. Firstly, a DoS attack model is proposed, in which the DoS attacker intentionally jams the communication channel to deteriorate the performance of the microgrid. Then, the evolution mechanism of the dispatch system of the microgrid under different attack scenarios is adequately discussed. On this basis, an optimal attack strategy based on enumerating-search algorithm is presented to allocate the limited attack resources reasonably, so as to maximize the effect of DoS attacks. Finally, the validity of the theoretical studies about the attack effect under different scenarios and the effectiveness of the proposed enumerating-search-based optimal attack strategy are illustrated through the simulation examples on the IEEE 57-bus system and IEEE 39-bus system, respectively.
Highlights
As a promising method with excellent characteristics in terms of resilience and dependability, distributed methods are gradually used in the field of energy management of microgrid
These methods have more stringent requirements on the working conditions, which will make the system more sensitive to communication failures and cyberattacks. It is both theoretical merits and practical values to investigate the malicious effect of cyber attacks on microgrid. is paper studies the distributed economic dispatch problem (EDP) under denial-of-service (DoS) attacks for the microgrid, in which each generator can communicate with its neighbors and has the computational capability to implement local operation
An optimal attack strategy based on enumerating-search algorithm is presented to allocate the limited attack resources reasonably, so as to maximize the effect of DoS attacks
Summary
E operation cost function of the ith generation is given by the following quadratic form [19]: Ci Pi αiP2i + βiPi + ci,. Assume there is a microgrid system with n generators, the objective of the economic dispatch of the microgrid is to minimize the total operation cost, which is given by n min Ci Pi. PD denotes the total power demand satisfying ni 1 Pmi in ≤ PD ≤ ni 1 Pmi ax, i.e., the problem is solvable. Based on a well-developed distributed algorithm to solve the EDP of the smart grid, the main problems we are interested in consist of the following:. (3) Does there exists an optimal attack strategy that renders maximum degradation of economic performance caused by the attacker?
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