Title: Modified T²-DAB converter with bidirectional power flow capability and reduced voltage stress suitable for DC microgrid integration

Authors: Kalash Srivastava; Abhik Jitendra Gazdhar; Rakesh Maurya; Shailendra Kumar

Addresses: Sardar Vallabhbhai National Institute of Technology, Surat – 395007, Gujarat, India ' Sardar Vallabhbhai National Institute of Technology, Surat – 395007, Gujarat, India ' Sardar Vallabhbhai National Institute of Technology, Surat – 395007, Gujarat, India ' Indian Institute of Technology Bhilai, Chhattisgarh, India

Abstract: This paper presents a modified three-phase dual-active bridge converter (3p-DAB) for the charging/discharging of electric vehicle (EV) batteries. The proposed converter has two distinct features namely: 1) small resistance can be used because the switches are only under one-third of their corresponding voltage stress. As a result, conduction losses are decreased; 2) all switches are turned ON/OFF with soft switching to minimise switching losses. In this paper, mathematical modelling, control, and design of suggested three-phase DAB converter (T²-DAB)-based EV battery charging system are carried out under various operating conditions. In order to control the power flow, a single-phase shift (SPS) modulation strategy is employed during the constant current (CC) and constant voltage (CV) charging modes. A prototype of the suggested T²-DAB converter is developed in the laboratory. The comparison of experimental findings to the theoretical analysis is found favourable.

Keywords: battery charging; CC/CV charging; DAB converters; electric vehicle; soft switching.

DOI: 10.1504/IJPEC.2024.141872

International Journal of Power and Energy Conversion, 2024 Vol.15 No.4, pp.315 - 337

Received: 17 Aug 2023
Accepted: 06 Mar 2024
Published online: 02 Oct 2024 *

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