Dynamic Modeling of Alkaline Electrolyzer Based on Matlab Simulink Approach

Abstract

Renewable energy as a backup energy source is becoming increasingly significant due to the world's environmental and ecological concerns. One of the most useful renewable energy methods used today is the production of hydrogen through electrolysis. When paired with solar-PV or wind energy, hydrogen produced by water electrolysis has the potential to play a key role as an energy carrier for future sustainable development. The inability to describe the internal operation of the process coupled with the flexibility issue is the main limitation of black box modelling. In this paper, an alkaline water electrolysis process was modelled dynamically. A stacked electrolyzer with each stack consisting of 21 series-connected steel cells and an electrolyte made of 30 wt% potassium hydroxide was employed. A dynamic thermal model for an advanced alkaline electrolyzer has been constructed based on basic thermodynamic and electrochemical reaction equations. The Matlab Simulink Model has this information. This approach provides more insight into the model dynamics and simulation based on the thermal and electrical approaches.