A Moving Target Defense Strategy against Load Redistribution Attacks

The load redistribution attack considers the actual equipment configuration and operation of the power system, and poses a threat to the safe and stable operation of the power system by tampering with load measurements. This paper proposes a moving target defense method based on topology control, which destroys the attacker's grasp of the power system information through transforming the system topology, thereby achieving the defense against load redistribution attacks and providing guarantees for the safe and reliable operation of the power system. Firstly, a bi-layer optimization model of load redistribution is established to analyze the attack strategy. Secondly, the optimization reconstruction mode of topology structure is analyzed to establish a network topology optimization model. Finally, the network topology optimization algorithm is combined with the state estimation to achieve moving target defense and testing of load redistribution attacks. The proposed method was tested in an IEEE 14 bus system, and it was proved that the proposed moving target defense method based on topological transformation can effectively defend load redistribution attacks and enhance the attack resistance of the power system.