Reduced-Order model for Inter-Inverter oscillations in islanded Droop-Controlled microgrids

Iraklis P. Nikolakakos, H. H. Zeineldin, Mohamed Shawky El-Moursi, James L. Kirtley

Research output: Contribution to journalArticlepeer-review

55 Scopus citations

Abstract

Representing a major technology toward the proliferation of sustainable energy resources, droop controlled microgrids have attracted numerous modeling approaches with a view to improving their operation and applicability. Acknowledging the low inertia of distributed generators and the network characteristics at the distribution level, this paper proposes a reduced order model for inter-inverter oscillations in autonomous droop controlled microgrids. At first, a simplified equivalent network on the basis of Kron reduction is suggested as an effective topology for the study of inter-inverter oscillating currents. The focus shifts toward low-frequency modes following the detailed small signal model and its simplification according to the singular perturbation theory with multiple time scales. Assuming accurate and instantaneous tracking of the voltage by the inner controllers on their local reference frame, the quasi steady state study results in a simple closed-loop model. This model is successfully benchmarked against the detailed model and other germane models over the full range of operational damping ratios.

Original languageBritish English
Article number7872506
Pages (from-to)4953-4963
Number of pages11
JournalIEEE Transactions on Smart Grid
Volume9
Issue number5
DOIs
StatePublished - Sep 2018

Keywords

  • distributed generation (DG)
  • Droop control
  • islanded microgrid
  • parallel inverters
  • small-signal stability

Fingerprint

Dive into the research topics of 'Reduced-Order model for Inter-Inverter oscillations in islanded Droop-Controlled microgrids'. Together they form a unique fingerprint.

Cite this