An Approach Towards Extreme Fast Charging Station Power Delivery for Electric Vehicles with Partial Power Processing

This article proposes an approach for realizing the power delivery scheme for an extreme fast charging (XFC) station that is meant to simultaneously charge multiple electric vehicles (EVs). A cascaded H-bridge converter is utilized to directly interface with the medium voltage grid while dual-active...

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Bibliographic Details
Published in:IEEE transactions on industrial electronics (1982) 2020-10, Vol.67 (10), p.8076-8087
Main Authors: Iyer, Vishnu Mahadeva, Gulur, Srinivas, Gohil, Ghanshyamsinh, Bhattacharya, Subhashish
Format: Article
Language:English
Subjects:
Batteries
Battery chargers
Cascaded H-bridge (CHB) converter
Charging
Charging stations
dc fast charger
DC-DC power converters
dual active bridge (DAB)
Electric bridges
Electric converters
Electric power
Electric vehicles
Electricity generation
Electronic devices
Energy conversion efficiency
energy storage
fast charging station
Laboratory tests
partial power processing
phase-shifted full-bridge (PSFB)
Power converters
solid-state transformer (SST)
Vehicle-to-grid
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Summary:This article proposes an approach for realizing the power delivery scheme for an extreme fast charging (XFC) station that is meant to simultaneously charge multiple electric vehicles (EVs). A cascaded H-bridge converter is utilized to directly interface with the medium voltage grid while dual-active-bridge based soft-switched solid-state transformers are used to achieve galvanic isolation. The proposed approach eliminates redundant power conversion by making use of partial power rated dc-dc converters to charge the individual EVs. Partial power processing enables independent charging control over each EV, while processing only a fraction of the total battery charging power. Practical implementation schemes for the partial power charger unit are analyzed. A phase-shifted full-bridge converter-based charger is proposed. Design and control considerations for enabling multiple charging points are elucidated. Experimental results from a down-scaled laboratory test-bed are provided to validate the control aspects, functionality, and effectiveness of the proposed XFC station power delivery scheme. With a down-scaled partial power converter that is rated to handle only 27% of the battery power, an efficiency improvement of 0.6% at full-load and 1.6% at 50% load is demonstrated.
ISSN:0278-0046
1557-9948
DOI:10.1109/TIE.2019.2945264