A composite passive damping method of the LLCL-filter based grid-tied inverter

Weimin Wu, Min Huang, Yunjie Sun, Xiongfei Wang, Frede Blaabjerg

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

23 Citations (Scopus)

Abstract

This paper investigates the maximum and the minimum gain of the proportional resonant based grid current controller for a grid-tied inverter with a passive damped high-order power filter. It is found that the choice of the controller gain is limited to the local maximum amplitude determined by Q-factor around the characteristic frequency of the filter and grid impedance. To obtain the Q-factor of a high-order system, an equivalent circuit analysis method is proposed and illustrated through several classical passive damped LCL- and LLCL-filters. It is shown that both the RC parallel damper that is in parallel with the capacitor of the LCL-filter or with the Lf-Cf resonant circuit of the LLCL-filter, and the RL series damper in series with the grid-side inductor have their own application limits. Thus, a composite passive damped LLCL-filter for the grid-tied inverter is proposed, which can effectively suppress the possible resonance in case that the grid impedance varies in a wide range. Simulation results are good agreement with the theoretical analysis.
Original languageEnglish
Title of host publicationProceedings of the 3rd IEEE International Symposium on Power Electronics for Distributed Generation Systems
PublisherIEEE Press
Publication date2012
Pages759-766
DOIs
Publication statusPublished - 2012
Event3rd International Symposium on Power Electronics for Distributed Generation Systems - Aalborg Congress & Culture Center, Aalborg, Denmark
Duration: 25 Jun 201228 Jun 2012

Conference

Conference3rd International Symposium on Power Electronics for Distributed Generation Systems
LocationAalborg Congress & Culture Center
CountryDenmark
CityAalborg
Period25/06/201228/06/2012

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