Distributed fault-tolerant secondary control for DC microgrids against false data injection attacks. (January 2023)

• Record Type: Journal Article
• Authors: Xie, Zongkui; Wu, Zhongqiang
• Is Part Of: International journal of electrical power & energy systems. Volume 144(2023)
• Publication Date: 2023-01
• Subjects: DC microgrids -- Distributed secondary control -- Fault-tolerant control -- Cyber-attacks -- Extended state observer; Electrical engineering -- Periodicals; Electric power systems -- Periodicals; Électrotechnique -- Périodiques; Réseaux électriques (Énergie) -- Périodiques; Electric power systems; Electrical engineering; Periodicals; 621.3
• DOI: 10.1016/j.ijepes.2022.108599
• Languages: English
• ISSNs: 0142-0615

Abstract

Highlights: The control problem for DC microgrid is transformed into a first-order MAS fault-tolerant consensus problem. A distributed extended state observer is designed to estimate the attack signals of each DG. A distributed fault-tolerant secondary controller is designed for compensating and suppressing the attack signal. The stability of the system is proved strictly. Abstract: This paper focuses on the issue of unknown false data injection attacks (FDIA) of controllers in DC microgrid, and proposes a distributed fault-tolerant secondary controller for DC microgrid to ensure that the control objectives of voltage regulation and current sharing can be achieved when the system is subject to FDIA. Firstly, the secondary control problem in DC microgrid with FDIA is transformed into a first-order leader-following multi-agent system fault-tolerant consensus problem, and the impact of FDIA signals on the microgrid system is analyzed. Then, a distributed extended state observer (DESO) is designed based on the derived multi-agent system, which observes the injected FDIA signals using the relative output error of each distributed generators and its neighbours. Further, based on the observed FDIA signals, a fault-tolerant secondary controller is designed to eliminate the adverse effects of the attack signals on the system. Particularly, the stability analyses for the designed DESO and secondary controller prove that the control system is global asymptotically stable. Finally, the effectiveness and superiority of the proposed fault-tolerant secondary control method are verified by simulation analyses of five cases.