SiC-based EV charger for DC bus second-order ripple reduction

Blas Perez, Miguel, Yang, Peng, Ming, Wenlong ORCID: https://orcid.org/0000-0003-1780-7292 and Ugalde Loo, Carlos ORCID: https://orcid.org/0000-0001-6361-4454 2023. SiC-based EV charger for DC bus second-order ripple reduction. IEEE Transactions on Transportation Electrification 10.1109/TTE.2023.3341394

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Abstract

An attractive dc/ac inverter for electric vehicle (EV) chargers is the three-phase four-wire inverter as it is able to handle unbalanced loads, supply neutral current, and provide balanced voltages. However, generation of second-order ripple on the dc bus is inevitable under the presence of unbalanced loads. To mitigate the magnitude of this ripple, conventional four-wire inverters require large and expensive capacitors in the neutral leg. To alleviate these issues, this paper presents a novel three-phase four-wire inverter based on silicon carbide MOSFETs. The topology is configured as a dc/dc buck converter for each phase leg and the neutral leg. Moreover, the capacitance of the neutral leg has been reduced by around eight times compared to that of the conventional neutral leg topology, in turn increasing the power density and reducing overall cost. By adopting a suitably designed control strategy, the proposed topology decreases the second-order ripple on the dc bus and provides neutral current when operating under unbalanced conditions.

Item Type:	Article
Date Type:	Published Online
Status:	In Press
Schools:	Engineering
Publisher:	Institute of Electrical and Electronics Engineers
ISSN:	2332-7782
Funders:	EPRSC
Date of First Compliant Deposit:	6 December 2023
Date of Acceptance:	1 December 2023
Last Modified:	22 Jan 2024 16:33
URI:	https://orca.cardiff.ac.uk/id/eprint/164490

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