Circulating current controller for parallel interleaved converters using PR controllers

Lorand Bede, Ghanshyamsinh Gohil, Mihai Ciobotaru, Tamas Kerekes, Remus Teodorescu, Vassilios G. Agelidis

Research output: Chapter in Book/Report/Conference proceedingConference proceeding contributionpeer-review

8 Citations (Scopus)

Abstract

To cope with power from large-scale renewable systems, more and more power electronic converters are used in parallel. Typically, carrier interleaving is used, thus leading to a decrease in filtering requirements. However, this causes additional circulating current to flow between the modules of the converter. The modules of the parallel converters are Voltage Source Converters (VSC). Usually, a coupled inductor (CI) is used to suppress the circulating current. However, the CI can be sensitive to the low order harmonic content of the circulating current which can appear owing to parameter mismatches between the converters. If the value of the low frequency circulating current is too high, this can saturate the CI. In order to ensure stable operation of the converter, this article presents a circulating current control based on the Proportional Resonant (PR) controller, which reduces the value of the low frequency circulating current. Furthermore, a specially designed sampling method is also presented, which ensures that only the fundamental component of the circulating current is fed to the circulating current controller.
Original languageEnglish
Title of host publicationIECON 2015 - 41st Annual Conference of the IEEE Industrial Electronics Society
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
Pages3997-4002
Number of pages6
ISBN (Electronic)9781479917624
DOIs
Publication statusPublished - 2015
Externally publishedYes
Event41st Annual Conference of the IEEE Industrial Electronics Society, IECON 2015 - Yokohama, Japan
Duration: 9 Nov 201512 Nov 2015

Other

Other41st Annual Conference of the IEEE Industrial Electronics Society, IECON 2015
CountryJapan
CityYokohama
Period9/11/1512/11/15

Keywords

  • Circulating current control Grid connected
  • Coupled inductor
  • Parellel interleaved converters

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