Active Power Sharing and Frequency Restoration in an Autonomous Networked Microgrid

M. Eskandari, L. Li, M. H. Moradi, P. Siano, F. Blaabjerg

Research output: Contribution to journalJournal articleResearchpeer-review

15 Citations (Scopus)
284 Downloads (Pure)

Abstract

Microgrid (MG) concept is considered as the best solution for future power systems, which are expected to receive a considerable amount of power through renewable energy resources and distributed generation units. Droop control systems are widely adopted in conventional power systems and recently in MGs for power sharing among generation units. However, droop control causes frequency fluctuations, which leads to poor power quality. This paper deals with frequency fluctuation and stability concerns of f-P droop control loop in MGs. Inspired from conventional synchronous generators, virtual damping is proposed to diminish frequency fluctuation in MGs. Then, it is demonstrated that the conventional frequency restoration method inserts an offset to the phase angle, which is in conflict with accurate power sharing. To this end, a novel control method, based on phase angle feedback, is proposed for frequency restoration in conjunction with a novel method for adaptively tuning the feedback gains to preserve precise active power sharing. Nonlinear stability analysis is conducted by drawing the phase variations of the nonlinear second-order equation of the δ-P droop loop and it is proved that the proposed method improves the stability margin of f-P control loop. Simulation results demonstrate the effectiveness of the proposed method.
Original languageEnglish
Article number8740943
JournalIEEE Transactions on Power Systems
Volume34
Issue number6
Pages (from-to)4706 - 4717
Number of pages12
ISSN0885-8950
DOIs
Publication statusPublished - Nov 2019

Keywords

  • Distributed generation (DG)
  • Droop control
  • Frequency restoration
  • Microgrid (MG)
  • Power control
  • Renewable energy resources (RESs)

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