Modelling Properties of an Alkaline Electrolyser

Abstract

This paper proposes a model of an electrolyser in the form of a subcircuit dedicated for SPICE. It takes into account both the electric static and dynamic properties of the considered device and is devoted to the optimisation of the parameters of the signal feeding this electrolyser, making it possible to obtain a high productivity and efficiency of the electrolysis process. Parameter values the describing current-voltage characteristics of the electrolyser take into account the influence of the concentration of the potassium hydroxide (KOH) solution. A detailed description of the structure and all the components of this model is included in the paper. The correctness of the elaborated model is verified experimentally in a wide range of changes in the value of the feeding current and concentration of the KOH solution. Some computations illustrating the influence of the amplitude, average value, duty factor, and frequency of feeding current on the productivity and efficiency of the electrolysis process are performed. On the basis of the obtained results of the investigations, some recommendations for the operating conditions of electrolysers are formulated.

Construction and Simulation of Digital Twin Model and Electrolyzer Wide Power Adaptation Model for Alkaline Electrolytic Water Hydrogen Production

“…If the electrolyzer module has k cells at rated power and (P w − k • P E ) is less than the minimum running power of cell, the power not absorbed by the cell module can be expressed as Eq. (8).…”

“…Shen X. et al developed a mathematical model of the equivalent impedance characteristics, electrothermal characteristics and power regulation characteristics of an alkaline electrolyzer [7]. Górecki et al described the voltammetric characteristics of the electrolyzer and considered the effect of the concentration of potassium hydroxide solution on the hydrogen production, and verified the correctness of their model experimentally by varying the electrolyte concentration [8]. The electrolyzer model developed in the above literature provides a valuable reference for modeling and simulation of hydrogen production from alkaline electrolytic water, but does not take into account the effect of fluctuations in input power on the electrolyzer.…”

Research on Hybrid Rectifier for High Power Electrolytic Hydrogen Production Based on Modular Multilevel Converter

“…It has been found that the quantity of hydrogen produced is influenced by the average value of the supply current. However, the presence of current ripple leads to additional power losses in the electrolyzer, reducing hydrogen production efficiency [6][7][8][9][10][11][12]. For instance, the influence of different characteristics of the supply current on the efficiency of the Proton Exchange Membrane (PEM) electrolyzer was evaluated in [6].…”