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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 language | English |
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Title of host publication | Proceedings of the 3rd IEEE International Symposium on Power Electronics for Distributed Generation Systems |
Publisher | IEEE Press |
Publication date | 2012 |
Pages | 759-766 |
DOIs | |
Publication status | Published - 2012 |
Event | 3rd International Symposium on Power Electronics for Distributed Generation Systems - Aalborg Congress & Culture Center, Aalborg, Denmark Duration: 25 Jun 2012 → 28 Jun 2012 |
Conference
Conference | 3rd International Symposium on Power Electronics for Distributed Generation Systems |
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Location | Aalborg Congress & Culture Center |
Country/Territory | Denmark |
City | Aalborg |
Period | 25/06/2012 → 28/06/2012 |
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HARMONY: HARMONY - Harmonic identification, mitigation and control in power electronics based power systems
Blaabjerg, F., Bak, C. L., Wang, X., Beres, R. N., Kwon, J., Gui, Y., Yoon, C. & Ebrahimzadeh, E.
01/02/2013 → 28/02/2018
Project: Research