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

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Conference article in proceedings
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Date
2016-09-18
Department
Department of Electrical Engineering and Automation
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Mcode
Degree programme
Language
en
Pages
8
Series
IEEE Energy Conversion Congress and Exposition (ECCE 2016), IEEE Energy Conversion Congress & Exposition
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 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.
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Keywords
active front-end rectifier, grid-voltage sag, LCL filter, line-voltage sensorless, small-signal linearization
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Citation
Kukkola , J & Hinkkanen , M 2016 , Grid-voltage sensorless control of a converter under unbalanced conditions: On the design of a state observer . in IEEE Energy Conversion Congress and Exposition (ECCE 2016) . IEEE Energy Conversion Congress & Exposition , IEEE , Milwaukee, WI , IEEE Energy Conversion Congress and Exposition , Milwaukee , United States , 18/09/2016 . https://doi.org/10.1109/ECCE.2016.7855134