Autonomous Control of Inverter-Interfaced Distributed Generation Units for Harmonic Current Filtering and Resonance Damping in an Islanded Microgrid

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Abstract

Harmonic current filtering and resonance damping have become important concerns in the operation and control of the islanded microgrids. To address these challenges, this paper proposes a control method for the inverter-interfaced Distributed Generation (DG) units, which can autonomously share the harmonic currents and resonance damping burdens. The approach employs a load compensator, which is based on the decomposition of output current, in addition to the outer droop-based power controller as well as the inner voltage and current controllers. The load compensator consists of a virtual fundamental impedance loop for the enhanced reactive power sharing, and a variable harmonic impedance loop which allows to counteract the harmonic voltage drops across the grid-side inductance of DG inverter and also to dampen out harmonic resonance propagation in the microgrid. Lastly, the laboratory tests on a three-phase islanded microgrid setup are carried out to validate the performance of the proposed control scheme.
Original languageEnglish
JournalI E E E Transactions on Industry Applications
Volume50
Issue number1
Pages (from-to)452-461
Number of pages10
ISSN0093-9994
DOIs
Publication statusPublished - Jan 2014

Keywords

  • Distributed generation (DG)
  • Harmonic filtering
  • Inverters
  • Load compensator
  • Microgrids
  • Negative inductance
  • Resonance damping

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