Observer-based state-space current control for a three-phase grid-connected converter equipped with an LCL filter

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Abstract

This paper presents a state-space current control method for active damping of the resonance frequency of the LCL filter and setting the dominant dynamics of the converter current through direct pole placement. A state observer is used, where upon additional sensors are not needed in comparison with the conventional L filter design. The relationship between the system delay and instability caused by the resonance phenomenon is considered. Nyquist diagrams are used to examine the parameter sensitivity of the proposed method. The method is validated with simulations and experiments.
Original languageEnglish
Pages (from-to)2700-2709
JournalIEEE Transactions on Industry Applications
Volume50
Issue number4
DOIs
Publication statusPublished - 15 Jul 2014
MoE publication typeA1 Journal article-refereed

Keywords

  • delay
  • LCL filter
  • Nyquist diagram
  • parameter sensitivity
  • phase-lead compensator
  • state-space current control

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