Digital Realization of Capacitor-Voltage Feedback Active Damping for LCL-Filtered Grid Converters

Zhen Xin, Xiongfei Wang, Poh Chiang Loh, Frede Blaabjerg

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

6 Citations (Scopus)

Abstract

The capacitor voltage of an LCL-filter can also be used for active damping, if it is fed back for synchronization. By this way, an extra current sensor can be avoided. Compared with the existing active damping techniques designed with capacitor current feedback, the capacitor voltage feedback active damping would however demand a noise-sensitive derivative term. A digital realization of this derivative term is generally a challenge with many methods developed for resolving it. However, these methods are still facing drawbacks, which have been comprehensively explained in this paper. To overcome their drawbacks, a new derivative method is then proposed, based on the non-ideal generalized integrator. The performance of the proposed derivative has been found to match the ideal “s” function closely. Active damping based on capacitor voltage feedback can therefore be realized accurately, as demonstrated by the presented experimental results.
Original languageEnglish
Title of host publicationProceedings of the 2015 IEEE Energy Conversion Congress and Exposition (ECCE)
Number of pages8
PublisherIEEE Press
Publication dateSept 2015
Pages2690-2697
DOIs
Publication statusPublished - Sept 2015
Event2015 IEEE Energy Conversion Congress and Exposition (ECCE) - Montreal, Canada
Duration: 20 Sept 201524 Sept 2015

Conference

Conference2015 IEEE Energy Conversion Congress and Exposition (ECCE)
Country/TerritoryCanada
CityMontreal
Period20/09/201524/09/2015

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