Observer-based current control for converters with an LCL filter: Robust design for weak grids

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review


Research units

  • ABB Oy Drives


This paper deals with state-feedback current control for power converters, which are equipped with an LCL filter and connected to a weak grid. The grid-side current is measured and other states needed by the current controller are estimated using a reduced-order observer. The control system is designed directly in the discrete-time domain. The gains of the control system are calculated using direct pole placement, assuming a strong grid. Recommendations for the nominal pole locations are given. The results show that the control system is robust against the unknown grid impedance, ranging from strong to very-weak grid conditions. The proposed design is validated by means of experiments.


Original languageEnglish
Title of host publicationIEEE 9th International Symposium on Sensorless Control for Electrical Drives, SLED 2018
Publication statusPublished - 13 Sep 2018
MoE publication typeA4 Article in a conference publication
EventIEEE International Symposium on Sensorless Control for Electrical Drives - Helsinki, Finland
Duration: 13 Sep 201814 Sep 2018
Conference number: 9

Publication series

NameIEEE international symposium on sensorless control for electrical drives
ISSN (Electronic)2166-6733


ConferenceIEEE International Symposium on Sensorless Control for Electrical Drives
Abbreviated titleSLED
Internet address

    Research areas

  • grid converter, LCL filter, reduced-order observer, state-feedback current control, weak grid, observers, control system, Inductance, Integrated circuit modeling, delays, current measurement, current control

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