The Series Connected Bidirectional Resonant Converter for Energy Storage Applications

Abstract

This paper proposes the series connected bidirectional soft switching resonant converter (BSRC). The BSRC is composed of 4 switches to increase the DC bus voltage for transferring the energy of PV and energy storage. The modes of operation divide in two modes for operating bidirectional voltages. The first part is the boost mode which is controlled for the constant 48 volts from batteries $(\mathbf{V}_{\mathbf{B}\mathbf{a}\mathbf{t}\mathbf{t}\pmb{1,2}})$ to the DC voltage buses $(\mathbf{V}_{\mathbf{H}\mathbf{i}\mathbf{g}\mathbf{h}})$ and second is buck mode at 24 volts for charging the batteries. The asymmetrical duty cycle control techniques (ADC) is proposed to control the constant input voltage for charging battery and DC voltage buses. The simulation and experimental results were given to verify the operation principles of the proposed BSRC and to evaluate its power regulation.