Adaptive Reconfigurable Power Electronic Circuits for Bidirectional Energy Flow in DC Microgrids

Abstract

Direct Current (DC) microgrids have emerged as a dominant architecture for integrating distributed renewable energy sources, battery energy storage systems (BESS), and modern high-efficiency electric loads such as electric vehicles (EVs). However, traditional power electronic converters operating in DC microgrids suffer from severe conversion efficiency degradation during wide-voltage fluctuations, high switching losses under light-load conditions, and rigid topology constraints that restrict dynamic bidirectional power routing. To resolve these challenges, this paper presents a comprehensive review and technical evaluation of Adaptive Reconfigurable Power Electronic Circuits (ARPECs) designed specifically for bidirectional energy flow in multi-voltage DC microgrids. By synthesizing state-of-the-art wide-bandgap (WBG) semiconductor topologies—including Silicon Carbide (SiC) and Gallium Nitride (GaN) devices—with dynamic relay- and solid-state-switched topology matrix architectures, this study demonstrates how real-time circuit reconfiguration significantly extends operational efficiency curves across broad load profiles. We formulate an analytical model for dynamic topology selection based on real-time DC bus impedance, battery state-of-charge (SoC), and bidirectional power flow magnitude. Simulation and experimental validation on a 400V/48V DC microgrid testbed demonstrate a maximum peak conversion efficiency of 98.6%, a 34.2% reduction in switching losses under light-load conditions, and seamless microsecond-level mode transitions without DC bus voltage sag. The review offers structural guidelines for next generation adaptive power converters, establishing actionable engineering principles for resilient, high-efficiency smart DC power distribution networks.

KEYWORDS: DC Microgrids, Bidirectional Power Converters, Adaptive Reconfigurable Circuits, Wide-Bandgap Semiconductors, Battery Energy Storage Systems, Topology Reconfiguration, High-Efficiency Power Electronics.