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Energies 2016, 9(8), 642; doi:10.3390/en9080642

Capacitor Current Feedback-Based Active Resonance Damping Strategies for Digitally-Controlled Inductive-Capacitive-Inductive-Filtered Grid-Connected Inverters

1
Center of Excellence in Electrical Power Engineering, Electrical Engineering Department, Amirkabir University of Technology, Tehran 15875-4413, Iran
2
Department of Energy Technology, Aalborg University, Aalborg East DK-9220, Denmark
3
Department of Electrical and Computer Engineering, Queens University, Kingston, ON K7L 3N6, Canada
*
Author to whom correspondence should be addressed.
Academic Editor: Chunhua Liu
Received: 31 May 2016 / Revised: 26 July 2016 / Accepted: 28 July 2016 / Published: 17 August 2016
(This article belongs to the Special Issue Microgrids 2016)

Abstract

Inductive-capacitive-inductive (LCL)-type line filters are widely used in grid-connected voltage source inverters (VSIs), since they can provide substantially improved attenuation of switching harmonics in currents injected into the grid with lower cost, weight and power losses than their L-type counterparts. However, the inclusion of third order LCL network complicates the current control design regarding the system stability issues because of an inherent resonance peak which appears in the open-loop transfer function of the inverter control system near the control stability boundary. To avoid passive (resistive) resonance damping solutions, due to their additional power losses, active damping (AD) techniques are often applied with proper control algorithms in order to damp the LCL filter resonance and stabilize the system. Among these techniques, the capacitor current feedback (CCF) AD has attracted considerable attention due to its effective damping performance and simple implementation. This paper thus presents a state-of-the-art review of resonance and stability characteristics of CCF-based AD approaches for a digitally-controlled LCL filter-based grid-connected inverter taking into account the effect of computation and pulse width modulation (PWM) delays along with a detailed analysis on proper design and implementation. View Full-Text
Keywords: active resonance damping; discrete-time domain; Inductive-capacitive-inductive (LCL)-filter; current control; grid-connected inverter active resonance damping; discrete-time domain; Inductive-capacitive-inductive (LCL)-filter; current control; grid-connected inverter
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Lorzadeh, I.; Askarian Abyaneh, H.; Savaghebi, M.; Bakhshai, A.; Guerrero, J.M. Capacitor Current Feedback-Based Active Resonance Damping Strategies for Digitally-Controlled Inductive-Capacitive-Inductive-Filtered Grid-Connected Inverters. Energies 2016, 9, 642.

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