Stable current sharing and voltage balancing in DC microgrids: A consensus-based secondary control layer

Michele Tucci, Lexuan Meng*, Josep M. Guerrero, Giancarlo Ferrari-Trecate

*Corresponding author

Research output: Contribution to journalJournal articleResearchpeer-review

36 Citations (Scopus)

Abstract

In this paper, we propose a secondary consensus-based control layer for current sharing and voltage bal-ancing in DC microGrids (mGs). To this purpose, we assume that Distributed Generation Units (DGUs) areequipped with decentralized primary controllers guaranteeing voltage stability. This goal can be achievedusing, for instance, Plug-and-Play (PnP) regulators, which allow one to analyze the behavior of the closed-loop mG by approximating local primary control loops with either unitary gains or first-order transferfunctions. Besides proving exponential stability, current sharing, and voltage balancing, we describe howto design secondary controllers in a PnP fashion when DGUs are added or removed. Theoretical results arecomplemented by simulations, using a 7-DGUs mG implemented in Simulink/PLECS, and experiments ona 3-DGUs mG.
Original languageEnglish
JournalAutomatica
Volume95
Pages (from-to)1-13
Number of pages13
ISSN0005-1098
DOIs
Publication statusPublished - Sep 2018

Keywords

  • Consensus algorithms
  • Current sharing
  • DC microgrids
  • Stability analysis
  • Voltage balancing

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