A Circulating Current Suppression Method for Parallel Connected Voltage-Source-Inverters (VSI) with Common DC and AC Buses

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Abstract

This paper describes a theoretical with experiment study on a control strategy for the parallel operation of threephase voltage source inverters (VSI), to be applied to
uninterruptible power systems (UPS). A circulating current suppression strategy for parallel VSIs is proposed in this paper based on circulating current control loops used to modify the reference currents by compensating the error currents among parallel inverters. Both of the cross and zero-sequence circulating currents are considered. The proposed method is coordinated together with droop and virtual impedance control. In this paper, droop control is used to generate the reference voltage of each inverter, and the virtual impedance is used to fix the output impedance of the inverters. In addition, a secondary control is used in order to recover the voltage deviation caused by the virtual impedance. And the auxiliary current control loop is added to acquire a better average current sharing performance among parallel VSIs, which can effectively suppress both of the
cross and zero-sequence circulating currents. Experimental results are presented in order to verify the effectiveness of the proposed control strategy.
Original languageEnglish
Title of host publicationProceedings of 8th IEEE Energy Conversion Congress and Exposition (ECCE), 2016
Number of pages6
PublisherIEEE Press
Publication dateSep 2016
ISBN (Electronic)978-1-5090-0737-0
DOIs
Publication statusPublished - Sep 2016
Event 8th Annual IEEE Energy Conversion Congress & Exposition: ECCE 2016 - Milwaukee, WI, United States
Duration: 18 Sep 201622 Sep 2016
http://www.ieee-ecce.org/

Conference

Conference 8th Annual IEEE Energy Conversion Congress & Exposition
CountryUnited States
CityMilwaukee, WI
Period18/09/201622/09/2016
SponsorIEEE, IEEE Industry Applications Society (IAS), IEEE Power Electronics and Industry Applications Societies (PELS)
Internet address

Keywords

  • Voltage source inverter
  • Parallel connected
  • Cross circulating current
  • Zero-sequence
  • Common DC and AC buses
  • Uninterruptible power system

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