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Electric Vehicle Ultra-Fast Battery Chargers: A Boost for Power System Stability?


Publication Year: 2021

Author(s): Mandrile F, Cittanti D, Mallemaci V, Bojoi R

Abstract:

Despite the constantly increasing performance and energy density of Li-ion batteries, their cost and weight still poses a major limit to electric vehicle (EV) driving range. As a consequence of the exponential growth of the EV market, DC fast-charging infrastructure is being rapidly deployed all around the world. Ultra-fast charging (UFC) stations are starting to pose serious challenges to the electric power system operation, mostly due to their high peak power demand and unregulated discontinuous operation. To address these issues, local energy storage can be installed, ensuring a smoother grid power absorption profile and allowing to provide grid-supporting features. In this work, a control solution for the grid-side AC/DC converter of next-generation EV UFC stations is proposed. A virtual synchronous compensator (VSC) control algorithm is implemented, in order to lessen the impact of the charging station on the utility and to provide the full spectrum of grid ancillary services (i.e., frequency regulation, reactive power compensation, harmonic reduction, short circuit current generation, etc.). The proposed control strategy is verified experimentally on a downscaled 15 kVA three-phase inverter, emulating the grid front-end of the charging station. The proposed charging station concept can effectively support the grid when needed, therefore representing a viable solution for a simpler integration of UFCs into the power distribution grid.

Source of Publication: World Electric Vehicle Journal

Vol/Issue: 12(1), 16: 1-21p.

DOI No.: 10.3390/wevj12010016

Publisher/Organisation: MDPI AG

Rights: Creative Commons Attribution (CC BY) license (https:// creativecommons.org/licenses/by/ 4.0/)

URL:
https://www.mdpi.com/2032-6653/12/1/16/pdf

Theme: Charging Infrastructure | Subtheme: Public charging station

Tags: Battery, Electric Vehicles, Battery chargers, Grid-connected converters, Power system stability, Three-phase inverters, Ultra-fast charging (UFC), Virtual synchronous compensator (VSC), Automotive batteries, Electric inverters, Electric power system control, Fast charging (Batteries), Harmonic reduction, Reactive power compensation, Three-phase inverter, Electric power transmission networks

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