Intermediate-Estimator-Based FDI Attack Detection and Compensation Methods for Multiarea LFC Systems

The close combination of information communication and power systems is an important feature of modern power systems, making them vulnerable to various cyber-attacks. In this paper, from the perspective of power system security, a method of false data injection (FDI) attack estimation and security defense is proposed to improve the security of multi-area load frequency control (LFC) systems. First, in the attack assumption, this paper removes the limitation of the bounded size of FDI attacks and requires only the first derivative to be bounded. Secondly, in order to estimate and defend against malicious FDI attacks, this paper proposes a novel attack estimation method based on an intermediate estimator and designs a defense control law to keep the system stable. Finally, a three-area IEEE 9-bus power system is used to verify the proposed algorithm.