Dynamical Analysis of a DC-DC Step-Down Converter Used As Interface with an Electrolyzer to Generate Green Hydrogen

Hydrogen is currently the most proposed element to replace fossil fuels in processes that require high heat power because it does not produce greenhouse gases in its combustion, so its production is based on the electrolysis of water using renewable sources of DC electrical energy. This work uses a quadratic buck converter to interconnect a DC source and electrolyzer, which requires feeding it with a regulated voltage. A combined model of the converter with the equivalent dynamic electrical circuit of the electrolyzer is proposed. Linear switching and linear average state space models are developed. The dynamic behavior of this model is compared with that resulting from using the static representation of the electrolyzer through simulation in Matlab software.