Plug-in identification method for an LCL filter of a grid converter

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This paper proposes a method for estimating the two inductances and the capacitance of an LCL filter, connected between the converter and the grid. Only the DC-bus voltage and converter phase currents need to be measured. An excitation signal is fed into the converter voltage reference. The fundamental and selected harmonic components are removed from the stored identification data to prevent biases in the parameter estimates. The parameters of the hold-equivalent discrete-time model are estimated recursively. The inductance and capacitance estimates are calculated from the estimated discrete-time parameters using the corresponding closed-form model. The proposed method can be added to existing converter control algorithms. It can provide the parameter estimates for the converter control. Further, it can be run occasionally during the normal operation in order to obtain an updated grid inductance estimate. Experimental results show that the proposed method yields very good parameter estimates and that it can also detect the changes in the grid inductance.
Original languageEnglish
Pages (from-to)6270-6280
Number of pages11
JournalIEEE Transactions on Industrial Electronics
Issue number8
Publication statusPublished - 2 Apr 2018
MoE publication typeA1 Journal article-refereed


  • converters
  • parameter estimation
  • power filters


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