Series Resonant Dual Active Bridge Converter With 2‐Degree‐of‐Freedom Modulation for Grid‐Coupled Electrolyzer‐Based Hydrogen Production

ABSTRACT The integration of hydrogen production for distributed energy storage necessitates power interfaces that are highly efficient, dynamically responsive, and reliable. This paper presents a two‐degree‐of‐freedom (2DOF) modulation strategy for an Inductance‐Capacitance Dual Active Bridge (LC‐DAB) converter to meet these requirements for electrolyzer applications. The proposed technique introduces a secondary side inter‐bridge phase shift to minimize circulating current and extend the soft‐switching range, thereby enhancing conversion efficiency. A comprehensive analysis evaluates the impact of key parameters on electrical behavior to ensure robust performance under steady‐state and dynamic conditions. The proposed method is verified through inclusive simulation studies and experimental evaluation of a 1.5‐kW laboratory prototype operating with a 37.5‐V input, a 10–30 V output voltage range, and a 50 A output current, achieving a maximum efficiency of 96.2%. A systematic loss breakdown substantiates the reported performance improvements. The results demonstrate that the proposed converter with its advanced control provides a cost‐effective, high‐efficiency power processing solution for small‐scale hydrogen generation, storage, and power buffering in consumer energy systems.