Abstract: Many power electronic applications, such as locomotives and Hybrid Electric Vehicles (HEVs), are moving towards a Multi-Input Multi-Output (MIMO) integrated DC-DC converter for its reliability and flexibility. This work proposes a Three-Input Integrated Bidirectional DC-DC (TIIBD) Converter to combine a Photovoltaic (PV) panel, Fuel Cell (FC) stack, and battery for grid-connected Hybrid Energy Microgrids (HEMs), enabling bidirectional power flow and energy storage. The TIIBD converter is modeled using state-space analysis, yielding a Transfer Function Matrix (TFM). PV and FC are optimized for maximum power via the P&O MPPT algorithm and CRCBP-based PI control. A 3-level Neutral Point Clamped (NPC) Inverter is used for power management between the grid and the TIIBD converter. The controllers for the three inputs are designed, and the steady-state performance of the converter with an AC load of 10KW for Microgrid (MG) application in different operating conditions is analysed and verified in MATLAB/Simulink platform.

Keywords: Three-Input Integrated DC-DC (TIID) converter, state-space modelling, small-signal analysis, Transfer Function Matrix (TFM), RGA, Contoured Robust Controller Bode Plot (CRCBP), Neutral Point Clamped Inverter, Microgrid

Pages: 52-62