NDLI: Grid-Current-Feedback Active Damping for <italic>LCL</italic> Resonance in Grid-Connected Voltage-Source Converters

Content Provider	IEEE Xplore Digital Library
Author	Xiongfei Wang Blaabjerg, F. Poh Chiang Loh
Copyright Year	1986
Abstract	This paper investigates active damping of LCL-filter resonance in a grid-connected voltage-source converter with only grid-current feedback control. Basic analysis in the s-domain shows that the proposed damping technique with a negative high-pass filter along its damping path is equivalent to adding a virtual impedance across the grid-side inductance. This added impedance is more precisely represented by a series RL branch in parallel with a negative inductance. The negative inductance helps to mitigate phase lag caused by time delays found in a digitally controlled system. The mitigation of phase-lag, in turn, helps to shrink the region of nonminimum-phase behavior caused by negative virtual resistance inserted unintentionally by most digitally implemented active damping techniques. The presented high-pass-filtered active damping technique with a single grid-current feedback loop is thus a more effective technique, whose systematic design in the z-domain has been developed in this paper. For verification, experimental testing has been performed with results obtained matching the theoretical expectations closely.
Sponsorship	IEEE Power Electronics Society
Starting Page	213
Ending Page	223
Page Count	11
File Size	6675345
File Format	PDF
ISSN	08858993
Volume Number	31
Issue Number	1
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2016-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Damping Inductance Resistance Current control Resonant frequency Cutoff frequency Impedance virtual impedance Voltage source converter LCL filter resonance damping non-minimum phase system voltage-source converter nonminimum phase system
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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