Hydrogen production system with fuzzy logic-controlled converter

Abstract

Electrolyte current must be controlled in the water electrolysis systems. For this purpose, the power converterfor the cell stack of the electrolyzer used in industrial hydrogen production is realized. A series resonant converter, whichis suitable for high input voltage and low output current applications, is used as power stage of the electrolyzer. Thehigh-frequency transformer is used for the impedance matching. While the system is running, the electrical resistanceof the electrolyzer changes continuously; thus, fuzzy logic controller (FLC) is used to control the output current of thepower converter. In this study, a 700-W converter prototype is designed and controlled by the frequency modulationtechnique in the range of 290–360 kHz. The converter is tested for different output currents and it is observed that thepower switches are turned on under soft switching conditions while FLC closely follows reference inputs.