Frequency-Variant Electronic Capacitor to Simultaneously Reduce Low-Frequency DC-Link Voltage Ripple and Improve Current THD of Grid-Connected Power Converters

P. Strajnikov, M. M. Peretz, A. Kuperman

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Electronic capacitor (EC) is a circuit typically aimed to replace (in part or entirely) the bulk DC-link capacitor of a grid-interfacing power converter in a plug-and-play manner. EC is realized by a bidirectional dc-dc converter terminated with small auxiliary capacitor. The converter is controlled such that its DC-link side terminals mimic the behavior of a capacitor with much higher constant capacitance. In this article, a modification of the classical EC control structure is proposed, imposing the DC-link side terminals to emulate a frequency-variant capacitor rather than a constant one. The proposed algorithm allows achieving simultaneous reduction of both DC-link voltage ripple and grid-side current total harmonic distortion (THD) compared to ones attained by classical solutions, thus improving the tradeoff between DC-link voltage dynamics and ac-side current quality inevitably present in any grid-connected power converter. The proposed methodology is well supported by experiments.

Original languageEnglish
Pages (from-to)5194-5203
Number of pages10
JournalIEEE Transactions on Transportation Electrification
Volume9
Issue number4
DOIs
StatePublished - 1 Dec 2023

Keywords

  • DC-link
  • dynamic response
  • electronic capacitor (EC)
  • grid-connected converters
  • total harmonic distortion (THD)

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering
  • Transportation
  • Automotive Engineering

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