Abstract
This paper proposes an LC (Inductor and Capacitor) impedance source bi-directional DC–DC converter by redesigning after rearranging the reduced number of components of a switched boost bi-directional DC–DC converter. This new converter with a conventional modulation scheme offers several unique features, such as a) a lower number of components and b) reduced voltage stress on the capacitor compared to existing topologies. The reduction of capacitor voltage stress has the potential of improving the reliability and enhancing converter lifespan. An analysis of the proposed converter was completed with the help of a mathematical model and state-space averaging models. The converter performance under different test conditions is compared with the conventional bi-directional DC–DC converter, Z-source converter, discontinuous current quasi Z-source converter, continuous current quasi Z-source converter, improved Z-source converter, switched boost converter, current-fed switched boost converter, and quasi switched boost converter in the Matlab Simulink environment. MATLAB/Simulink results demonstrate that the proposed converter has lesser components count and reduced capacitors’ voltage stresses when compared to the topologies mentioned above. A 24 V to 18 V LC-impedance source bi-directional converter and a conventional bidirectional converter are built to investigate the feasibility and benefits of the proposed topology. Experimental results reveal that capacitor voltage stresses, in the case of proposed topology are reduced by 75.00% and 35.80% in both boost and buck modes, respectively, compared to the conventional converter circuit.
Highlights
The study, development, and applications of bidirectional power converters are gaining a lot of attention due to their vital role in areas like renewable energy systems, DC microgrids, hybrid energy storage systems, smart mobility, etc
bidirectional converter (BDC) are widely used in several applications, such as battery-powered electric vehicles (BEVs) or hybrid electric vehicles (HEVs), power trains, uninterruptable power supplies (UPS), smart grids, charging stations for BEVs and plug-in hybrid electric vehicles (PHEV), aerospace, defense, aerospace, and non-conventional energy sources such as photovoltaic (PV) arrays, fuel cells (FCs), and wind turbines
BDCs are widely adopted by the electric vehicle industry to achieve objectives, such as battery charging/discharging and energy recovery during regeneration modes of operation in electric vehicles
Summary
The study, development, and applications of bidirectional power converters are gaining a lot of attention due to their vital role in areas like renewable energy systems, DC microgrids, hybrid energy storage systems, smart mobility, etc. A bidirectional DC-DC converter (BDC) allows power flow in both directions. This functionality is not available in a traditional unidirectional DC-DC converter. Because of this flexibility, BDCs are widely used in several applications, such as battery-powered electric vehicles (BEVs) or hybrid electric vehicles (HEVs), power trains, uninterruptable power supplies (UPS), smart grids, charging stations for BEVs and plug-in hybrid electric vehicles (PHEV), aerospace, defense, aerospace, and non-conventional energy sources such as photovoltaic (PV) arrays, fuel cells (FCs), and wind turbines. BDCs are widely adopted by the electric vehicle industry to achieve objectives, such as battery charging/discharging and energy recovery during regeneration modes of operation in electric vehicles. The electric vehicle must be powered only by batteries or other electrical sources
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