Observer-Based <i>H</i>_∞ Load Frequency Control for Networked Power Systems with Limited Communications and Probabilistic Cyber Attacks

Abstract

This paper studies load frequency control (LFC) for networked power systems with limited communications and probabilistic cyber attacks. Some restrictions exist during the information transmission, which can impair behavior and lead to instability of power systems. Throughout this paper, we consider such power systems that involve multi-path missing measurements and input–output time-varying delays as well as cyber attacks in the communication channels. A feedback controller is presented, which is based on the observer to implement H∞ LFC for power systems with disturbance rejection level γ. By Lyapunov stability theory, adequate criteria are given to ensure the stable operation of power systems. Finally, the validity of theoretical analysis is demonstrated and illustrated by numerical simulations.

Keywords

• LFC
• networked power systems
• observer
• time-varying delays
• multi-path missing measurements
• cyber attacks