Backstepping control of a grid-connected four-leg PWM rectifier under both balanced and unbalanced grid conditions

Ali Chebabhi (), Ala Addin Mohammed Al-dwa, Said Barkat and Fouad Zebiri
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Ali Chebabhi: University of Msila
Ala Addin Mohammed Al-dwa: University of Msila
Said Barkat: University of Msila
Fouad Zebiri: University of Bordj Bou Arreridj

International Journal of System Assurance Engineering and Management, 2023, vol. 14, issue 1, No 7, 18 pages

Abstract: Abstract This study focuses on a backstepping control (BSC) of a three-phase four-leg pulse width modulation (PWM) rectifier under balanced and unbalanced load and grid conditions. The proposed BSC for the three-phase four-leg PWM rectifier (3P-4LR) connected to the grid is build up using three independent backstepping controllers based on Lyabonov theory to control simultaneously DC voltage and input currents. As a result, unit power factor, stable DC-bus voltage, sinusoidal input 3P-4LR currents with a lower harmonic content and lower zero-sequence and natural currents can be accurately achieved. Not only that, robustness against voltage grid fluctuations, load and filter inductance variations can also be carried out. The effectiveness, superiority, good dynamic, and steady-state performances of the proposed BSC based 3P-4LR have been validated by numerical simulations compared to the conventional proportional-integral control under balanced and unbalanced load and grid conditions.

Keywords: Grid-connected four-leg PWM rectifier; Backstepping control (BSC); Lyabonov theory; Power quality; Zero-sequence current (ZSC); Unbalanced conditions (search for similar items in EconPapers)
Date: 2023
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DOI: 10.1007/s13198-022-01826-8

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