<p>This paper presents a new zero voltage transistion (ZVT) bi-directional DC-DCconverter for energy storage system in DC traction. This bidirectional converter can transfers the power flow from low voltage side to high voltage side and viceversa. The conventional hard-switched non-isolated converter improved with the additional auxiliary cell to obtain zero voltage transition for the IGBTs. The main advantages of this topology are reduced the switching losses and improved the efficiency as well.The main aim of this converter is to achieve the operation of zero voltage transition during the commutation  of main switches from off to on by utilizing auxiliary cell, which consist active and passive elements.The boost and buck modes of operations are achieved with the zero voltage transistion, which reduce the IGBTs current stresses and switching losses.This paper mainly describes the operation principles and the evaluation of the simulation results with the aid of Matlab simulations.The obtained results were proved the  expected assumptions of the theoretical  analysis.</p>

Summary This paper presents a new soft‐switching non‐isolated bidirectional converter (BDC) for the energy storage systems in DC traction. For this proposed converter, the soft commutation is achieved by turning on the main power switches with the help of auxiliary active switches, the inductor, the capacitor, and diodes. The basic operation of the converter is characterized as two operating types: boost and buck. The switching devices obtained zero voltage transition (ZVT) in both operating types, but the major advantage of this topology is achieved by reducing turn‐on losses with improved efficiency and minimizing reverse recovery time of IGBTs' anti‐parallel diodes. This paper mainly describes the principles of operation, design analysis, simulation, and implementation of DC‐DC converter of laboratory prototype with 150 V/250 V system under 1‐kW output power.

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This paper proposes a new zero-current transition based non-isolated bidirectional DC-DC converter for battery storage appliances in DC traction vehicles. The proposed converter has an auxiliary IGBTS, auxiliary inductor, auxiliary capacitor and bypass diodes are additionally to the main converter module. Usually, the zero-current transition achieved for the main IGBTs circuit has major advantages like reduced turn-off losses, overall conduction losses and minimized reverse recovery problems to the anti-parallel diodes of the main IGBTs. The operation principles, simulation and experimental investigations on 150 V/250 V/1 kW laboratory prototype are presented in order to show the performance and also to verify the soft-switching characteristics in boost/buck modes of the converter.

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