Control-Oriented Design and Performance Evaluation of a Three-Terminal Storage-Assisted EV Fast-Charging System with an Interleaved Bidirectional Buck-Boost Converter

F. S. Saeed S., Saleh R. A. A., Haidar A., Ghaleb M., Abualkebash H., A.A. Saif M. A. A.

6th International Conference on Emerging Smart Technologies and Applications, eSmarTA 2026, Dhamar, Yemen, 4 - 05 Ağustos 2026, (Tam Metin Bildiri)

  • Yayın Türü: Bildiri / Tam Metin Bildiri
  • Doi Numarası: 10.1109/esmarta70636.2026.11652324
  • Basıldığı Şehir: Dhamar
  • Basıldığı Ülke: Yemen
  • Anahtar Kelimeler: bidirectional EV fast charging, common DC-link, current sharing, harmonic compliance, interleaved Buck-Boost converter, ripple attenuation, storage-assisted charging system
  • Kocaeli Üniversitesi Adresli: Evet

Özet

This paper presents a three-terminal storage-assisted bidirectional EV fast-charging system based on a common DC-link that coordinates a grid-side three-phase active rectifier, an EV-side interleaved bidirectional Buck-Boost converter, and an auxiliary storage branch. Unlike conventional off-board bidirectional chargers, the proposed architecture introduces an additional controllable DC-side energy path and treats the EV-side Buck-Boost stage as the main battery-side regulating element. A control-oriented formulation is developed with emphasis on buck/boost operation, current sharing, ripple attenuation, and DC-link coupling, followed by an analytical control framework for the grid-side and DC/DC stages. The system is evaluated under steady-state charging, steady-state discharging, and charging-to-discharging transition conditions. The results confirm stable bidirectional operation, balanced branch-current sharing, and reduced battery-side ripple, with EV-side current ripple of 2.532 A in charging and 2.677 A in discharging. The EV-side converter achieves efficiencies of 90.990% and 89.525%, while the storage-side branch reaches 98.670% and 96.098% in charging and discharging, respectively, and the rectifier efficiency is 94.45% in charging and 90.427% in discharging. In addition, introducing the damping term (RD) improves grid-current harmonic performance, reducing THD from 4.43% to 1.60% in charging mode and from 0.53% to 0.12% in discharging mode, while preserving IEEE Std 519 compliance. Overall, the proposed architecture provides a technically credible and control-consistent framework for high-power bidirectional EV fast charging.