State Observer for Grid-Voltage Sensorless Control of a Converter Equipped with an LCL Filter: Direct Discrete-Time Design

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Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2016-07-01
Major/Subject
Mcode
Degree programme
Language
en
Pages
13
3133-3145
Series
IEEE Transactions on Industry Applications, Volume 52, issue 4
Abstract
Synchronization with the power system is an essential part of control of grid-connected converters. This paper proposes a grid-voltage sensorless synchronization and control scheme for a converter equipped with an LCL filter, measuring only the converter currents and the dc voltage. A discrete-time pole-placement design method is used to formulate an adaptive full-order observer for the estimation of the frequency, angle, and magnitude of the grid voltage. The proposed discrete-time design method enables straightforward implementation and suits low sampling rates better than its continuous-time counterpart. The analytically derived design is experimentally validated, and the results demonstrate rapid convergence of the estimated quantities. Moreover, the experimental tests show that grid-voltage sensorless operation is possible under balanced and unbalanced grid disturbances and distorted grid conditions.
Description
Keywords
Active front-end rectifier, adaptive observer, distributed generation, line-voltage sensorless, small-signal linearization, state feedback, synchronization
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Citation
Kukkola , J & Hinkkanen , M 2016 , ' State Observer for Grid-Voltage Sensorless Control of a Converter Equipped with an LCL Filter: Direct Discrete-Time Design ' , IEEE Transactions on Industry Applications , vol. 52 , no. 4 , 7433435 , pp. 3133-3145 . https://doi.org/10.1109/TIA.2016.2542060