Bidirectional modular DC/DC converter for directcurrent microgrids

Abstract

This work presents concept and implementation of a bidirectional coupling between direct-current circuits of significantly different voltage levels using galvanic isolation in the form of a high-frequency transformer. Standard 5-kW/100-kHz compact dual active bridge modules were used for construction of the coupling. Possibilities of modular construction of the system were presented, in which both parallel and series-parallel connections of developed modules were analyzed. The work takes into account simulation studies of the presented solution as well as studies of an experimental model equipped with an advanced control and measurement system based on DSP-type processors. Modular construction of the converter ensures simple configuring depending on the application, increased reliability and reduced design and maintenance costs.