A Wide-Range High-Voltage-Gain Bidirectional DC-DC Converter for V2G and G2V Hybrid EV Charger

• Published in: IEEE transactions on industrial electronics (1982) Vol. 69; no. 5; pp. 4718 - 4729
• Main Authors: Heydari-doostabad, Hamed, O'Donnell, Terence
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.05.2022; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Batteries; Battery chargers; Bidirectional dc–dc converter; DC-DC power converters; Electric vehicle charging; Feedback control; high voltage gain; High-voltage techniques; Logic gates; nonisolated; Power flow; semiconductor utilization factor (SUF); Stress; Switches; Vehicle-to-grid; Voltage converters (DC to DC); Voltage gain; wide-range voltage gain
• ISSN: 0278-0046; 1557-9948
• DOI: 10.1109/TIE.2021.3084181

This article proposes a new wide-range bidirectional dc-dc converter that has an improved voltage gain transfer ratio for use in electric vehicle (EV) applications. The converter preserves the common electrical ground between input and output terminals, and presents a low-voltage stress of switches, high utilization factor, and high efficiency. The proposed EV charger performance is evaluated for a bidirectional power flow in grid-connected vehicle-to-grid (V2G) and grid-to-vehicle (G2V) modes. The converter uses a dead-beat current controller in the dc-dc and dc-ac stages, which has a smooth, accurate, and fast response. Finally, experimental results for a 500 W, 40-200 V prototype are provided under a bidirectional power flow in a closed-loop system in the presence of the proposed dead-beat controllers. The obtained results substantiate the theoretical analysis and the applicability of this structure. The converter exhibits the capability for EV battery charging/discharging and demonstrates a peak efficiency of 97.2% and 96.8% in the step-down and step-up modes of operation, respectively.