Integrated Energy Management in DC Microgrid Systems with Hybrid PV-PEMFC-Battery Configurations

This paper presents an in-depth study on the integrated energy management of a DC microgrid system that synergistically combines Photovoltaic (PV) arrays, Proton Exchange Membrane Fuel Cells (PEMFCs) and lithium-ion batteries. The objective is to harness multiple renewable energy sources to meet dynamic DC load demands while maintaining high reliability under fluctuating environmental conditions and varying battery States of Charge (SoC). A standout feature of the system is a 300V, 48AH lithium-ion standby battery, integrated with a sophisticated bidirectional converter, significantly enhancing operational flexibility and energy storage efficiency. A robust 2KW PEMFC system, connected via a DC-DC converter equipped with Proportional-Integral (PI) control, bolsters the system's reliability and responsiveness. This configuration ensures continuous power supply during periods of low solar irradiance and when the battery's SoC drops below 30% by enabling the fuel cell to not only power the DC load but also recharge the battery simultaneously. The simulation results reveal the impressive capability of the proposed energy management system to optimize the utilization of available energy resources. The system demonstrates superior performance in balancing energy supply and demand, enhancing overall efficiency and reliability. This research contributes valuable insights into the practical deployment of hybrid energy systems, paving the way for more resilient and sustainable DC microgrids.