Abstract
The main objective of this paper was to study a bidirectional direct current to direct current converter (BDC) topology with a high voltage conversion ratio for electric vehicle (EV) batteries connected to a dc-microgrid system. In this study, an unregulated level converter (ULC) cascaded with a two-phase interleaved buck-boost charge-pump converter (IBCPC) is introduced to achieve a high conversion ratio with a simpler control circuit. In discharge state, the topology acts as a two-stage voltage-doubler boost converter to achieve high step-up conversion ratio (48 V to 385 V). In charge state, the converter acts as two cascaded voltage-divider buck converters to achieve high voltage step-down conversion ratio (385 V to 48 V). The features, operation principles, steady-state analysis, simulation and experimental results are made to verify the performance of the studied novel BDC. Finally, a 500 W rating prototype system is constructed for verifying the validity of the operation principle. Experimental results show that highest efficiencies of 96% and 95% can be achieved, respectively, in charge and discharge states.
Highlights
In recent years, to reduce fossil energy consumption, the development of environmentally friendly dc-microgrid technologies have gradually received attention [1,2,3,4,5,6,7]
grid-connected converters (GCCs) is to maintain the dc-bus voltage constant, while in order to ensure the reliability of operation for dc-microgrids, a mass of battery energy systems (BES) can usually be accessed into the system
bidirectional dc/dc converter (BDC) circuit topologies of the isolated [8,9,10] and non-isolated type [11,12,13,14,15,16,17,18,19,20,21,22,23] have been described for a variety of system applications
Summary
To reduce fossil energy consumption, the development of environmentally friendly dc-microgrid technologies have gradually received attention [1,2,3,4,5,6,7]. A typical dc-microgrid structure includes a lot of power electronics interfaces such as bidirectional grid-connected converters (GCCs), PV/wind distributed generations (DGs), battery energy systems (BES), electric vehicles (EVs), and so on [4]. They connect together with a high-voltage dc-bus, so that dc home appliances can draw power directly from the dc-bus. In this system, the main function of GCCs is to maintain the dc-bus voltage constant, while in order to ensure the reliability of operation for dc-microgrids, a mass of BES can usually be accessed into the system. BDCs circuit topologies of the isolated [8,9,10] and non-isolated type [11,12,13,14,15,16,17,18,19,20,21,22,23] have been described for a variety of system applications
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