New Design Approach for Grid-Current-Based Active Damping of LCL Filter Resonance in Grid-Connected Converters

Mahmoud A. Gaafar; Gamal M. Dousoky; Emad M. Ahmed; Masahito Shoyama; Mohamed Orabi

New Design Approach for Grid-Current-Based Active Damping of LCL Filter Resonance in Grid-Connected Converters

Vol. 18, No. 4, pp. 1165-1177, Jul. 2018

10.6113/JPE.2018.18.4.1165

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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.

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Cite this article

[IEEE Style]

M. A. Gaafar, G. M. Dousoky, E. M. Ahmed, M. Shoyama, M. Orabi, "New Design Approach for Grid-Current-Based Active Damping of LCL Filter Resonance in Grid-Connected Converters," Journal of Power Electronics, vol. 18, no. 4, pp. 1165-1177, 2018. DOI: 10.6113/JPE.2018.18.4.1165.

[ACM Style]

Mahmoud A. Gaafar, Gamal M. Dousoky, Emad M. Ahmed, Masahito Shoyama, and Mohamed Orabi. 2018. New Design Approach for Grid-Current-Based Active Damping of LCL Filter Resonance in Grid-Connected Converters. Journal of Power Electronics, 18, 4, (2018), 1165-1177. DOI: 10.6113/JPE.2018.18.4.1165.