Detection and Mitigation of False Data in Cooperative DC Microgrids with Unknown Constant Power Loads

Andreu Cecilia*, Subham Sahoo, Tomislav Dragicevic, Ramon Costa Castello, Frede Blaabjerg

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

34 Citations (Scopus)
26 Downloads (Pure)

Abstract

The rapid development and implementation of distributed control algorithms for DC microgrids has increased the vulnerability of this type of system to false data injection attacks, being one of the most prominent types of cyber attacks. This fact has motivated the development of different false data detection and impact mitigation strategies. A common approach for the detection is based on implementing an observer that can achieve a reliable estimation of the system states. However, approaches available in the literature assume that the underlying microgrid model is linear, which is generally not the case, specially when the DC microgrid supplies nonlinear constant power loads (CPLs). Consequently, this work proposes a distributed non-linear observer approach that can robustly detect and reconstruct the applied false data attack in the DC microgrid's current sensors and cyber-links, even in the presence of local unknown CPLs. First, the system is transformed into an observable form. Second, a high-order sliding-mode observer is implemented to estimate the system states and CPL, even in the presence of false data. Finally, the estimation is used to reconstruct the attack signal. The robustness of the proposed strategy is validated through numerical simulations and in an experimental prototype under measurement noise, uncertainty and communication delays.
Original languageEnglish
Article number9334413
JournalI E E E Transactions on Power Electronics
Volume36
Issue number8
Pages (from-to)9565-9577
Number of pages13
ISSN0885-8993
DOIs
Publication statusPublished - 22 Jan 2021

Keywords

  • Microgrids
  • Cybersecurity
  • Cyber Attacks
  • Constant Power Load (CPL)
  • FDIAs
  • Cyber Attack Detection
  • Cyber Attack Mitigation
  • cyber-physical systems
  • resilient controller
  • Cyber-attacks
  • non-linear observer
  • DC microgrid

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