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Abstract
A higher-order passive power filter (LLCL-filter) for the grid-connected inverter is becoming attractive for the industrial applications due to the possibility to reduce the cost of the copper and the magnetic material. To avoid the well-known resonance problems of the LLCL-filter, it is requested to use either passive or active damping methods. This paper analyzes the stability of the LLCL-filter based grid-connected inverter and identifies a critical resonant frequency for the LLCL-filter when sampling and transport delays are considered. In a high resonant frequency region the active damping is not required but in a low resonant frequency region the active damping is necessary. The basic LLCL resonance damping properties of different feedback states based on a notch filter concept are also studied. Then an active damping method which is using the capacitor current feedback for LLCL-filter is introduced. Based on this active damping method, a design procedure for the controller is given. Last, both simulation and experimental results are provided to validate the theoretical analysis of this paper.
Original language | English |
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Journal | IEEJ Transactions on Industry Applications |
Volume | 4 |
Issue number | 3 |
Pages (from-to) | 187-195 |
Number of pages | 9 |
ISSN | 0913-6339 |
DOIs | |
Publication status | Published - 2015 |
Keywords
- LLCL-filter, grid-connected converter, active damping, current control, resonant frequency, stability
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- 1 Finished
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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