Analysis and design of grid-current-feedback active damping for LCL resonance in grid-connected voltage source converters

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Abstract

This paper investigates the active damping of LCL-filter resonance within single-loop grid current control of grid-connected voltage source converters. First, the basic analysis in the continuous s-domain reveals that the grid-current-feedback active damping forms a virtual impedance across the grid-side inductor, and the use of a high-pass filter with a negative sign shapes the virtual impedance by an RL damper paralleled by a negative inductance. It is further found that such a negative virtual inductance plays a critical role in mitigating the phase lag caused by the time delay in a digital control system. The instability induced by the negative virtual resistance, which is commonly experienced in the feedback-type active damping, can thus be avoided. A systematic design method of the highpass filter is also proposed by the help of root locus analysis in the discrete z-domain. Lastly, experimental tests are presented to validate the theoretical analysis.
Original languageEnglish
Title of host publicationProceedings of the 2014 IEEE Energy Conversion Congress and Exposition (ECCE)
Number of pages8
PublisherIEEE Press
Publication dateSep 2014
Pages373-380
ISBN (Print)978-1-4799-5776-7
DOIs
Publication statusPublished - Sep 2014
Event2014 IEEE Energy Conversion Congress and Exposition (ECCE) - Pittsburgh, Pittsburgh, United States
Duration: 14 Sep 201418 Sep 2014

Conference

Conference2014 IEEE Energy Conversion Congress and Exposition (ECCE)
LocationPittsburgh
CountryUnited States
CityPittsburgh
Period14/09/201418/09/2014

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