As part of the development of advanced control strategies for the Battery Interfacing Converter (BIC), the paper Generalized Multiport, Multilevel NPC Dual-Active-Bridge Converter for EV Auxiliary Power Modules—authored by Oriol Esquius Mas, Àlber Filbà Martínez, Joan Nicolás Apruzzese, and Sergio Busquets Monge—has been published in Electronics (MDPI).

This work, carried out collaboratively by the project coordinator IREC and project partner UPC, presents a single-stage multiport BIC for electric vehicles, capable of supplying several groups of low-voltage (LV) loads operating at different voltage levels. The design is based on a multiport, multilevel neutral-point-clamped (NPC) dual-active-bridge (DAB) converter, and the paper proposes both a modulation approach and a closed-loop control strategy for this generalised multiport 2L–NL NPC DAB architecture.

The proposed topology supports bidirectional, galvanically isolated power transfer between the high-voltage traction battery and multiple LV battery modules, while powering the EV’s LV loads at different voltage levels—without the need for multiple conversion stages. The authors also introduce a generalised modulation and control scheme that enables full control over the state of charge (SoC) of the LV modules, validated through hardware-in-the-loop testing.

Overall, this research provides a robust theoretical and experimental foundation for the BIC control design and reinforces the 2L–3L NPC DAB converter as an efficient, scalable, and modular solution for interfacing the EV traction battery with auxiliary systems.