Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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New Design Approach for Grid-Current-Based Active Damping of LCL Filter Resonance in Grid-Connected Converters

  • Gaafar, Mahmoud A. (APEARC, Faculty of Engineering, Aswan University) ;
  • Dousoky, Gamal M. (Electrical Engineering Dept., Minia University) ;
  • Ahmed, Emad M. (Dept. of Electrical Engineering, Jouf University) ;
  • Shoyama, Masahito (Graduate School of Information Science and Electrical Engineering, Kyushu University) ;
  • Orabi, Mohamed (APEARC, Faculty of Engineering, Aswan University)
  • Received : 2017.08.29
  • Accepted : 2018.03.27
  • Published : 2018.07.20
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Abstract

This paper investigates the active damping of grid-connected LCL filter resonance using high-pass filter (HPF) of the grid current. An expression for such HPF is derived in terms of the filter components. This expression facilitates a general study of the actively damped filter behavior in the discrete time domain. Limits for the HPF parameters are derived to avoid the excitation of unstable open loop poles since such excitation can reduce both the damping performance and the system robustness. Based on this study, straightforward co-design steps for the active damping loop along with the fundamental current regulator are proposed. A numerical example along with simulation and experimental results are presented to verify the theoretical analyses.

Keywords

References

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