An Output Ripple-Free Fast Charger for Electric Vehicles Based on Grid-Tied Modular Three-Phase Interleaved Converters

An off-board dc fast battery charger for electric vehicles (EVs) with an original control strategy aimed to provide ripple-free output current in the typical EV batteries voltage range is presented in this article. The proposed configuration is based on modular three-phase interleaved converters and...

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Bibliographic Details
Published in:IEEE transactions on industry applications 2019-11, Vol.55 (6), p.6102-6114
Main Authors: Drobnic, Klemen, Grandi, Gabriele, Hammami, Manel, Mandrioli, Riccardo, Ricco, Mattia, Viatkin, Aleksandr, Vujacic, Marija
Format: Article
Language:English
Subjects:
Alternating current
Batteries
Battery chargers
Charging
Computer simulation
Configurations
Coupling
Couplings
Electric converters
Electric potential
Electric vehicle (EV)
Electric vehicle charging
Electric vehicles
fast charging
Inductors
Maintenance costs
modular interleaved converter
Modules
Parallel connected
Power harmonic filters
Rectifiers
ripple-free output current
Ripples
Topology
Voltage
Voltage control
Voltage converters (DC to DC)
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Summary:An off-board dc fast battery charger for electric vehicles (EVs) with an original control strategy aimed to provide ripple-free output current in the typical EV batteries voltage range is presented in this article. The proposed configuration is based on modular three-phase interleaved converters and supplied by the low-voltage ac grid. The ac/dc interleaved three-phase active rectifier is composed of three standard two-level three-phase converter modules with a possibility to slightly adjust the dc-link voltage level in order to null the output current ripple. A modular interleaved dc/dc converter, formed by the same three-phase converter modules connected in parallel, is used as an interface between the dc link and the battery. The use of low-cost, standard and industry-recognized three-phase power modules for high-power fast EV charging stations enables the reduction of capital and maintenance costs of the charging facilities. The effect of coupling on the individual input/output inductors and total input/output current ripples has been investigated as well, considering both possible coupling implementations, i.e., inverse and direct coupling. Numerical simulations are reported to confirm the feasibility and the effectiveness of the whole EV fast charging configuration, including the proposed control strategy aimed to null the ripple of the output current. Experimental results are provided by a reduced scale prototype of the output stage to verify the ripple-free output current operation capability.
ISSN:0093-9994
1939-9367
DOI:10.1109/TIA.2019.2934082