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

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

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23 Citationer (Scopus)

Abstrakt

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.
OriginalsprogEngelsk
TitelProceedings of the 3rd IEEE International Symposium on Power Electronics for Distributed Generation Systems
ForlagIEEE Press
Publikationsdato2012
Sider759-766
DOI
StatusUdgivet - 2012
Begivenhed3rd International Symposium on Power Electronics for Distributed Generation Systems - Aalborg Congress & Culture Center, Aalborg, Danmark
Varighed: 25 jun. 201228 jun. 2012

Konference

Konference3rd International Symposium on Power Electronics for Distributed Generation Systems
LokationAalborg Congress & Culture Center
LandDanmark
ByAalborg
Periode25/06/201228/06/2012

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