Design and Control of a Modular 48/400V Power Converter for the Grid Integration of Energy Storage Systems

Battery energy storage systems are increasingly used to stabilize and balance energy supply systems. For stationary applications, as UPS, electrochemical battery modules are often used, being Li - Ion and lead acid the most popular choice mostly due to power ranges, energy capacity and reversible capability. The present paper is focused in the design of a modular converter to boost the voltage of a Li - Ion battery module from 48 to 400 Volts, with a maximum power of 18 kW. The selected power converter topology is based on a DC/DC converter built by an interleaving synchronous rectifier (ISR) connected in series to a Three Phase Dual Active Bridge (TPDAB). The paper includes an study on alternative topologies, the dynamic average model for the selected approach, the control system design, the selection and implementation of a hardware prototype and the validation of the complete system using simulation under PLECs.