Grid-voltage sensorless control of a converter under unbalanced conditions: On the design of a state observer

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Research units


This paper deals with grid-voltage sensorless synchronization and control under unbalanced grid conditions. A three-phase grid-connected converter equipped with an LCL filter is considered, and no other signals than the converter currents and the DC-link voltage are measured for control. An augmented adaptive state observer is proposed for estimation of the positive- and negative-sequence components of the grid voltage. The proposed observer is tested as a part of a sensorless control system. Experimental results show that the proposed method works well even in highly unbalanced grid conditions.


Original languageEnglish
Title of host publicationIEEE Energy Conversion Congress and Exposition (ECCE 2016)
Publication statusPublished - 18 Sep 2016
MoE publication typeA4 Article in a conference publication
EventIEEE Energy Conversion Congress and Exposition - Milwaukee, United States
Duration: 18 Sep 201622 Sep 2016
Conference number: 8

Publication series

NameIEEE Energy Conversion Congress & Exposition
ISSN (Print)2329-3721
ISSN (Electronic)2329-3748


ConferenceIEEE Energy Conversion Congress and Exposition
Abbreviated titleECCE
CountryUnited States

    Research areas

  • active front-end rectifier, grid-voltage sag, LCL filter, line-voltage sensorless, small-signal linearization

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