Abstract
This paper proposes a single-stage AC-DC rectifier with power factor correction (PFC), high-frequency isolation and bidirectional power conversion capability for on-board battery charger (OBC) applications. The proposed converter is based on the interleaving technique and the Dual Active Bridge (DAB) operation, applying the phase-shift control to regulate the power flow. In addition to topology, this article presents a control strategy for reducing low-frequency power ripples transferred to the secondary side without any additional component and hence maintaining overall size and cost. The single-phase OBC can interchange active power with the grid to charge batteries while performing grid-to-vehicle (G2V) functionality or transferring energy back to the grid via vehicle-to-grid (V2G) mode. The theoretical analysis of the converter including modulation strategy and feedback control scheme are presented. The proposed topology and control strategy have been verified by experimental results of a 650 W SiC-based prototype.
Highlights
The electrification of transportation is a major technological approach for decreasing air pollution in heavily populated places and a promising alternative to contribute to energy diversification and greenhouse gas (GHG) emission reduction
New challenges and opportunities are emerging in terms of the on-board chargers (OBCs) for electric vehicles mainly related to power density, efficiency, reliability, safety and lifetime [2,3,4]
Power flow control is performed by using the phase-shift (PS) technique, i.e., controlling the angle between primary and secondary sides through an HF transformer, with turn ratios set to n = 2 = V1 /V2 to achieve efficient operation of the Dual Active Bridge (DAB) converter
Summary
The electrification of transportation is a major technological approach for decreasing air pollution in heavily populated places and a promising alternative to contribute to energy diversification and greenhouse gas (GHG) emission reduction. Automotive market reports show that electric vehicles (EVs) will account for about 30% of the market by 2030 [1]. In this context, new challenges and opportunities are emerging in terms of the on-board chargers (OBCs) for electric vehicles mainly related to power density, efficiency, reliability, safety and lifetime [2,3,4]. EV battery chargers can be broadly classified according to installation as off-board (level 3) and on-board (levels 1 and 2) and power flow capability (unidirectional or bidirectional) [5]. Bidirectional OBCs will enable vehicle-to-grid (V2G) functionalities, such as peak shaving, reactive power compensation, frequency regulation and spinning reserve [6,7,8].
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