Detection‐based weighted H∞ LFC for multi‐area power systems under DoS attacks

• Published in: IET control theory & applications Vol. 13; no. 12; pp. 1909 - 1919
• Main Authors: Cheng, Zihao, Yue, Dong, Hu, Songlin, Xie, Xiangpeng, Huang, Chongxin
• Format: Journal Article
• Language: English
• Published: The Institution of Engineering and Technology 01.08.2019
• Subjects: attack detection; attack influence; communication delay; control system synthesis; delay systems; delays; denial‐of‐service attacks; detection mechanism; detection‐based; frequency control; hold‐input strategy; identified DoS attacks; input delay; LFC system; linear matrix inequalities; load regulation; Lyapunov methods; multiarea power systems; power system control; resilient control gain; resilient LFC scheme; resilient load frequency control scheme design; switched system method; switched time delay system model; switching control inputs; time‐varying systems; zero‐input strategy
• ISSN: 1751-8644; 1751-8652
• DOI: 10.1049/iet-cta.2018.6469

This study is concerned with resilient load frequency control (LFC) scheme design of multi‐area power systems with communication delay and aperiodic denial‐of‐service (DoS) attacks. First, to identify DoS attacks, a detection mechanism in the actuator side is proposed which is a time counter measuring the input delay. The identified DoS attacks are constrained by its upper bound of frequency and duration. When DoS attacks are identified, actuator switches to zero‐input strategy from hold‐input strategy. According to the switching control inputs, switched time delay system model is established to describe the attack influence on LFC system. Further, a criterion of preserving weighted H∞ performance is derived by combining piecewise Lyapunov–Krasovskii functional method with switched system method. Based on the criterion, the resilient control gain is designed by solving a set of LMIs. Finally, numerical simulations are given to verify the validness of the attack detection based resilient LFC scheme.