Small-Signal Analysis of the Microgrid Secondary Control Considering a Communication Time Delay

Ernane Antônio Alves Coelho, Dan Wu, Josep M. Guerrero, Juan C. Vasquez, Tomislav Dragičević, Čedomir Stefanović, Petar Popovski

Research output: Contribution to journalJournal articleResearchpeer-review

177 Citations (Scopus)

Abstract

This paper presents a small-signal analysis of an islanded microgrid composed of two or more voltage-source inverters connected in parallel. The primary control of each inverter is integrated through an internal current and voltage loops using proportional resonant compensators, a virtual impedance, and an external power controller based on frequency and voltage droops. The frequency restoration function is implemented at the secondary control level, which executes a consensus algorithm that consists of a load-frequency control and a single time delay communication network. The consensus network consists of a time-invariant directed graph and the output power of each inverter is the information shared among the units, which is affected by the time delay. The proposed small-signal model is validated through simulation results and experimental results. A root locus analysis is presented that shows the behavior of the system considering control parameters and time delay variation.
Original languageEnglish
Article number7492603
JournalIEEE Transactions on Industrial Electronics
Volume63
Issue number10
Pages (from-to)6257-6269
Number of pages13
ISSN0278-0046
DOIs
Publication statusPublished - Oct 2016

Keywords

  • Delay differential equations (DDEs)
  • Frequency and voltage droop control
  • Secondary control
  • Small-signal analysis

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