Analysis of the passive damping losses in LCL-filter-based grid converters

Rafael Peña-Alzola, Marco Liserre, Frede Blaabjerg, Rafael Sebastían, J̈org Dannehl, Friedrich Wilhelm Fuchs

Research output: Contribution to journalArticlepeer-review

504 Citations (Scopus)
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Passive damping is the most adopted method to guarantee the stability of LCL-filter-based grid converters. The method is simple and, if the switching and sampling frequencies are sufficiently high, the damping losses are negligible. This letter proposes the tuning of different passive damping methods and an analytical estimation of the damping losses allowing the choice of the minimum resistor value resulting in a stable current control and not compromising the LCL-filter effectiveness. Stability, including variations in the grid inductance, is studied through root locus analysis in the z-plane. The analysis is validated both with simulation and with experiments.

Original languageEnglish
Pages (from-to)2642-2646
Number of pages5
JournalIEEE Transactions on Power Electronics
Issue number6
Early online date5 Oct 2012
Publication statusPublished - 30 Jun 2013


  • LCL-filter
  • passive damping
  • stability
  • voltagesource converter


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