A unified active damping control for single-phase differential buck inverter with LCL-filter

W. Yao, X. Wang, X. Zhang, Y. Tang, P.C. Loh, F. Blaabjerg

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

23 Citations (Scopus)

Abstract

The single-phase differential mode buck inverter is recently introduced with a differential mode for power transfer and a common mode for actively decoupling the second-order power oscillation. However, it is limited to islanded applications with an LC filter. This paper addresses the stability and control of a grid-connected differential mode buck inverter with an LCL filter. A generalized small-signal model of the inverter is built first with the averaged switching model. It is shown that the LCL filter resonance merely occurs in the differential mode, while an LC filter resonance exists in the common mode, provided that the filter parameters of the two bridges are kept the same. A unified active damping control approach is then proposed for stabilizing the inverter and improving the transient performance under a wide range of grid impedance. Lastly, experimental tests are carried out and the results confirm the effectiveness of the theoretical analysis and proposed control approach.
Original languageEnglish
Title of host publicationProceedings of the IEEE 6th International Symposium on Power Electronics for Distributed Generation Systems, PEDG 2015
Number of pages8
PublisherIEEE Press
Publication dateJun 2015
Pages1-8
ISBN (Print)978-1-4799-8585-2
ISBN (Electronic)978-1-4799-8586-9
DOIs
Publication statusPublished - Jun 2015
EventIEEE 6th International Symposium on Power Electronics for Distributed Generation Systems, PEDG 2015 - Pullman Aachen Quellenhof hotel, Aachen, Germany
Duration: 22 Sept 201525 Sept 2015

Conference

ConferenceIEEE 6th International Symposium on Power Electronics for Distributed Generation Systems, PEDG 2015
LocationPullman Aachen Quellenhof hotel
Country/TerritoryGermany
CityAachen
Period22/09/201525/09/2015
SeriesIEEE International Symposium on Power Electronics for Distributed Generation Systems (PEDG)
ISSN2329-5767

Keywords

  • Active power decoupling
  • Active damping
  • Differential mode buck converter
  • Small signal model

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