V-I droop-based distributed event- and self-triggered secondary control of AC microgrids

Masoud Hajian*, Mohammad S. Golsorkhi, Alireza Ranjbar, Qobad Shafiee, Mehdi Savaghebi

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

In this study, distributed event-and self-triggered (ST) control methods are proposed for accurate load sharing and voltage control in islanded AC microgrids with resistive line impedances. The proposed control framework is comprised of a two-level control structure. At the primary level, the V-I droop control method is adopted. In this method, the distributed energy resources (DERs) are synchronised to a common synchronous reference frame and load sharing is accomplished through voltage-current droop characteristics in this frame. The secondary level, which has a distributed structure, mitigates the voltage deviations induced by the primary level and eliminates the current sharing error caused by the line impedances. The data exchange among the DERs is controlled using event- and ST algorithms. In order to reduce the communication burden, the feedback control laws are realised using estimated variables, which are updated at certain event times. The event times are extracted based on Lyapunov stability analysis and by consideration of the V-I droop characteristics. Comparison of event and ST algorithms shows that while the event-triggered strategy offers superior dynamic response, the ST approach requires lower network traffic. The efficacy of the proposed scheme is verified through real time simulation results.
Original languageEnglish
JournalIET Smart Grid
Volume6
Issue number3
Pages (from-to)271-283
Number of pages13
ISSN2515-2947
DOIs
Publication statusPublished - 2023

Keywords

  • Distributed control
  • Event-triggered control
  • Microgrid
  • Power electronics
  • Secondary control

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