Bi-directional DC-DC converter with energy management and protection capabilities For LVDC grids

Abstract

The work outlines a framework for enhancing the efficacy of current LVDC microgrid protection techniques. Currently, the two most significant challenges are the detection and interruption of fault currents. The primary aim of a protection strategy is to maintain the dependability of a power system by selectively isolating the components that are responsible for the fault occurrence. Consequently, it is imperative to interrupt the fault current before it reaches the components' maximum ratings. A proposal has been put forth for the implementation of a bidirectional converter to verify the functionality of a "converter cascaded with an Impedance Source Circuit Breaker (ISCB)" system. Contemporary investigations on DC microgrids suggest that the converter and impedance source breaker integration is functional; however, these two pivotal components have been analyzed separately, with the presumption of effortless integration. The combination is expected to exhibit fault current interruption capabilities and function as an energy hub. The analysis and design of a converter operating in Average Current Mode control (ACM) and an ISCB are conducted as separate entities. This work presents a proposed methodology for validating protection features. The obtained simulated results provide confirmation of the successful interruption of the circuit and ripple reduction on the DC branch input current.