Abstract
In this paper, to solve the hard-switching operation problem and the lack of existing a bidirectional power flow path from output to the energy storage device of the conventional three-port converter, a new soft-switched bidirectional multi-port converter is proposed. A large number of switches, different power flow paths which vary in each operating mode, and changing the outputs and their power levels are some of the challenges to provide soft-switching conditions in multi-port converters. In the proposed converter, by changing the topology of the conventional three-port converter, the bidirectional power exchangeability between ports is provided. Moreover, a soft-switching cell is added, which can operate independently from the output power levels. Less number of components with low volume is one of the important features of this multi-port converter. Due to the soft-switching operation of the proposed converter, the size of passive components and heat-sink is reduced. In addition, by the use of coupled inductors in the soft-switching cell, only one magnetic core is used and thus, single-stage power conversion is achieved and conduction loss is reduced. In this paper, the converter operating modes are presented, and design considerations are discussed. Finally, a 200 W–200 V prototype is implemented, and the theoretical analysis is validated by the experimental results.
Highlights
Developments in technologies of power sources and energy storage devices and the demand to utilize varieties of sources in a specific system have led to the emergence of hybrid energy systems
To overcome the problems associated with the conventional three-port converter (TPC), including the hard-switching operation and disability of energy storage systems (ESS) charging from the output, a new soft-switched bidirectional multi-port DC-DC converter is proposed
The ESS charging ability from the output port is provided for the conventional three-port converter
Summary
Developments in technologies of power sources and energy storage devices and the demand to utilize varieties of sources in a specific system have led to the emergence of hybrid energy systems. Through a single-inductor bidirectional converter, all sources can exchange power together This converter uses three switches, but in order to extend the number of operating modes, three extra relays are utilized. A single inductor converter is achieved that reduces the converter size, and the power conversion is done in a single stage for every operating mode This converter does not have the ability to transfer power from the output to the ESS and it is not applicable. To overcome the problems associated with the conventional TPC, including the hard-switching operation and disability of ESS charging from the output, a new soft-switched bidirectional multi-port DC-DC converter is proposed.
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