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

Chivon Choeung, Meng Leang Kry and Young Il Lee
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Chivon Choeung: Faculty of Electrical Engineering, National Polytechnic Institute of Cambodia, Phnom Penh 12409, Cambodia
Meng Leang Kry: Electrical and Information Engineering, Seoul National University of Science and Technology, Seoul 01811, Korea
Young Il Lee: Electrical and Information Engineering, Seoul National University of Science and Technology, Seoul 01811, Korea

Energies, 2018, vol. 11, issue 12, 1-16

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.

Keywords: battery charger; fast charging; unbalanced grid; linear matrix inequality (LMI); robust control (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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