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Energies 2018, 11(12), 3389; https://doi.org/10.3390/en11123389

Robust Tracking Control of a Three-Phase Charger under Unbalanced Grid Conditions

1
Faculty of Electrical Engineering, National Polytechnic Institute of Cambodia, Phnom Penh 12409, Cambodia
2
Electrical and Information Engineering, Seoul National University of Science and Technology, Seoul 01811, Korea
*
Author to whom correspondence should be addressed.
Received: 6 November 2018 / Revised: 23 November 2018 / Accepted: 30 November 2018 / Published: 3 December 2018
(This article belongs to the Section Electrical Power and Energy System)
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Abstract

This paper presents a robust control technique for three-phase chargers under unbalanced grid conditions. The control method consists of inner-loop robust grid-current control and outer-loop proportional integral control for constant current (CC) and constant voltage (CV) control. A dual-current control for the inner-loop positive and negative sequence is employed to eliminate the unbalanced current caused by the grid so that a constant current and voltage can be provided to the batteries. The inner-loop robust controllers utilize state feedback with integral action in the dq-synchronous frame. A linear matrix inequality-based optimization scheme is used to determine stabilizing gains of the controllers to maximize the convergence rate to steady state in the presence of uncertainties. The uncertainties of the system are described as the potential variation range of the inductance and resistance in the L-filter. View Full-Text
Keywords: battery charger; fast charging; unbalanced grid; linear matrix inequality (LMI); robust control battery charger; fast charging; unbalanced grid; linear matrix inequality (LMI); robust control
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Choeung, C.; Kry, M.L.; Lee, Y.I. Robust Tracking Control of a Three-Phase Charger under Unbalanced Grid Conditions. Energies 2018, 11, 3389.

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