A Review on Current Reference Calculation of Three-Phase Grid-Connected PV Converters under Grid Faults

Ehsan Afshari, Gholam Reza Moradi, Yongheng Yang, Babak Farhangi, Shahrokh Farhangi

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

20 Citations (Scopus)

Abstract

Unbalanced grid voltage dips may lead to unbalanced non-sinusoidal current injections, dc-link voltage oscillations, and active and/or reactive power oscillations with twice the grid fundamental frequency in three-phase grid-connected Photovoltaic (PV) systems. Double grid frequency oscillations at the dc-link of the conventional two-stage PV inverters can further deteriorate the dc-link capacitor, which is one of the most life-limiting components in the system. Proper controls of these converters may efficiently address this problem. In those solutions, Current Reference Calculation (CRC) is one of the most important issues that should be coped with for a reliable operation of grid-connected converters under unbalanced grid faults. Accordingly, this paper reviews the existing CRC methods and presents a current reference generation method, which can have 16 unique modes. Issues are also investigated in this paper that the two-stage three-phase converter faces in each mode. The performance of the CRC method is verified and compared to the prior-art methods by simulations under unbalanced voltage dips.
Original languageEnglish
Title of host publicationProceedings of the 2017 IEEE Power and Energy Conference at Illinois (PECI)
Number of pages7
PublisherIEEE Press
Publication dateFeb 2017
ISBN (Print)978-1-5090-5550-0
DOIs
Publication statusPublished - Feb 2017
Event2017 IEEE Power and Energy Conference at Illinois (PECI) - Champaign, United States
Duration: 23 Feb 201724 Feb 2017

Conference

Conference2017 IEEE Power and Energy Conference at Illinois (PECI)
Country/TerritoryUnited States
CityChampaign
Period23/02/201724/02/2017

Keywords

  • Power oscillation
  • Current limitation
  • DC-link voltage oscillation
  • Low-Voltage Ride-Through (LVRT)
  • Photovoltaic (PV) systems
  • Two-stage PV inverter

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