Interleaved Multi-Port Non-Isolated DC/DC Converter for Green Hydrogen Production with PV/PEM Electrolyzer System

This paper introduces and examines a multi-port non-isolated DC-DC converter designed for the integration of photovoltaic (PV) systems with a DC grid and the generation of green hydrogen via a Proton Exchange Membrane (PEM) electrolyzer. This system is particularly effective when the available PV power surpasses the power demands of the DC bus. In such scenarios, the excess power is converted into green hydrogen using PEM technology. The proposed multi-port nonisolated DC-DC converter features a two-phase interleaved boost converter to transfer power from the PV system to the DC bus, integrated with a two-phase interleaved buck converter that supplies the necessary power to the PEM during the discharge phase of the interleaved boost converter. Two control loops are established to regulate the proposed converter. The first control loop manages the interleaved boost converter to achieve Maximum Power Point Tracking (MPPT) from the PV system. The second control loop governs the interleaved buck converter to channel the surplus PV power into green hydrogen production through PEM technology. The performance of proposed multiport system is tested using PSCAD/EMTDC simulation software.