Dynamic load altering attack detection for cyber physical power systems via sliding mode observer

Abstract

In this paper, the attack detection problem of smart grid under dynamic load altering attack (DLAA) is investigated. An attack detection scheme based on deviation signal is proposed. The system model is described by generator swing equation and power flow DC equation, and the PI controller model is considered in the model input. For state estimation, H∞ performance index is used to enhance the robustness of sliding mode observer against attacks. Then, an attack detection logic is designed to detect attacks by comparing the deviation signal and threshold. Finally, the proposed attack detection scheme is verified by numerical simulations, and the feasibility of the proposed algorithm in reality is verified by StaeSim hardware-in-the-loop simulation platform.