Rapid Impedance Estimation Algorithm for Mitigation of Synchronization Instability of Paralleled Converters under Grid Faults

Mads Graungaard Taul, Robert Eric Betz, Frede Blaabjerg

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

1 Citation (Scopus)

Abstract

Paralleled grid-connected converters operated as grid-following structures are vulnerable to transient synchronization instability during grid faults. This paper mathematically describes the instability phenomenon of paralleled converters and why it is more pronounced than for single-converter operation. Based on this model, instability can be averted by modifying each converter current reference depending on the external network impedance where asymptotic stability is proven. A rapid impedance estimation algorithm is presented, which can extract the network impedance based on the disturbance of the grid fault. This estimation is used to accurately adjust the converter current references in order to guarantee stability of all paralleled converters for any severity of the grid fault. The proposed control structure is verified in a detailed simulation study and through experimental tests, which demonstrate its potential and robustness.
Original languageEnglish
Title of host publicationProceedings of the 2020 22nd European Conference on Power Electronics and Applications (EPE'20 ECCE Europe)
Number of pages10
PublisherIEEE Press
Publication dateSep 2020
Article number9215866
ISBN (Electronic)978-9-0758-1536-8
DOIs
Publication statusPublished - Sep 2020
EventEPE'20 ECCE Europe: 22nd European Conference on Power Electronics and Applications - Lyon, France
Duration: 7 Sep 202011 Sep 2020

Conference

ConferenceEPE'20 ECCE Europe: 22nd European Conference on Power Electronics and Applications
CountryFrance
CityLyon
Period07/09/202011/09/2020

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