A Deviation Elimination Control Based on Autonomous Current-Sharing Controller for the Parallel-Connected Inverters in AC Microgrids

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Abstract

Conventional autonomous current-sharing controller (ACSC) will induce inevitable frequency and voltage magnitude deviations due to the output currents and virtual impedances. Thereby secondary control has been proposed to restore the frequency and voltage magnitude deviations by using communication links. In this paper, an autonomous deviation eliminative control method is proposed for the parallel-connected inverters in AC islanded microgrids in order to simplify the control scheme and to improve power quality and control reliability. Two high-pass filters are included in synchronous-reference-frame virtual impedance loop and are activated in steady-state operation to attenuate frequency and voltage magnitude deviations, meanwhile maintaining the autonomous current-sharing performance among the parallel inverters. Simulation results based on two parallel-connected voltage controlled inverters from Matlab/Simulink verify the effectiveness of the proposed approach in different scenarios.
Original languageEnglish
Title of host publicationProceedings of the 2018 International Power Electronics Conference (IPEC-Niigata 2018 -ECCE Asia)
Number of pages6
PublisherIEEE
Publication date22 Oct 2018
Pages3678-3683
Article number8507423
ISBN (Print)978-1-5386-4190-3
ISBN (Electronic)978-4-88686-405-5
DOIs
Publication statusPublished - 22 Oct 2018
EventThe 2018 International Power Electronics Conference
- Niigata, Japan
Duration: 20 May 201824 May 2018

Conference

ConferenceThe 2018 International Power Electronics Conference
CountryJapan
CityNiigata
Period20/05/201824/05/2018

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Keywords

  • ACSC
  • islanded microgrids
  • restoration control
  • deviation

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