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

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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Authors

Date

2018-04-02

Department

Department of Electrical Engineering and Automation

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Mcode

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Language

en

Pages

10

Series

IEEE Transactions on Industrial Electronics

Abstract

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.

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Keywords

converters, parameter estimation, power filters

Other note

DOI

10.1109/TIE.2017.2787546

Citation

Koppinen, J, Kukkola, J & Hinkkanen, M 2018, ' Plug-in identification method for an LCL filter of a grid converter ', IEEE Transactions on Industrial Electronics, vol. 65, no. 8, pp. 6270-6280 . https://doi.org/10.1109/TIE.2017.2787546

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https://urn.fi/URN:NBN:fi:aalto-201802091358

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[article-cris] Sähkötekniikan korkeakoulu / ELEC