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A Novel Nonisolated Three-Port BBB DC-DC Converter for Multifunctional PV, Battery, and DC Grid Interfacing Applications
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DOI：10.1109/JESTIE.2025.3642049.png)
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Abstract
En 中文
This article presents a novel nonisolated bidirectional buck-boost dc-dc converter without employing a transformer or coupled inductor. An active switched inductor network is integrated into the front-end section of a modified SEPIC converter, facilitating a wide voltage conversion ratio while reducing voltage stress on the major switches. The proposed converter offers multifunctional capabilities, enabling seamless integration with photovoltaic (PV) systems, battery storage, and dc grids. The battery can be charged either from the PV system or directly from the dc grid, enhancing system flexibility. Furthermore, synchronous rectification is implemented using complementary switching to improve conversion efficiency. The steady-state analysis is presented for both continuous conduction mode and discontinuous conduction mode. A dynamic model of the converter is developed, and its performance is validated under both open-loop and closed-loop conditions using SiC mosfets. Experimental results verify the enhanced performance and practicality of the proposed converter for energy storage systems in dc grids, electric vehicles, and other industrial power conversion applications.
Keywords:
Batteries
Inductors
DC-DC power converters
Switches
Topology
Capacitors
Voltage
Wind energy
Voltage control
Load flow
Active switch inductor
bidirectional buck-boost high gain dc-dc converter
discontinuous conduction mode (DCM)
multiport converter
small-signal modelling
synchronous rectification
wide voltage conversion ratio
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