State observer for grid-voltage sensorless control of a converter under unbalanced conditions

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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date
2018
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Mcode
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Language
en
Pages
12
Series
IEEE Transactions on Industry Applications
Abstract
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 signals other 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. Dynamic performance limitations of the proposed method and effects of parameter errors are analyzed. The proposed observer is tested as part of a sensorless control system. Experimental results show that the proposed method works well even under highly unbalanced grid conditions.
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Keywords
observers, sensorless control, adaptation models, estimation error, frequency estimation, integrated circuit modeling
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Citation
Kukkola , J & Hinkkanen , M 2018 , ' State observer for grid-voltage sensorless control of a converter under unbalanced conditions ' , IEEE Transactions on Industry Applications , vol. 54 , no. 1 , pp. 286-297 . https://doi.org/10.1109/TIA.2017.2749305