State Observer for Grid-Voltage Sensorless Control of a Converter Equipped With an LCL Filter: Direct Discrete-Time Design
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School of Electrical Engineering |
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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en
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1-13
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IEEE Transactions on Industry Applications
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 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
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Kukkola, Jarno & Hinkkanen, Marko. 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. 1-13. ISSN 0093-9994 (printed). DOI: 10.1109/tia.2016.2542060.