Modeling and analysis of an electrolyser for power to gas applications
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Inclou dades d'ús des de 2022
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hdl:2117/372307
Tipus de documentProjecte Final de Màster Oficial
Data2022-07-22
Condicions d'accésAccés obert
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Abstract
Year after year the installed capacity of renewable sources (such as photovoltaics or wind turbines) is growing, but this increase must be accompanied by new storage systems to make the most of the generation and respond to the load demand even when the generation isn’t possible. One of the options that is under development and has a very promising future as a complement to renewable energy systems is hydrogen electrolyser, which by applying electricity splits water into oxygen and hydrogen. The produced hydrogen can be used as an energy carrier, stored and converted back into electricity when needed by using fuel cells. The idea of this study is to derive a mathematical model of an electrolyser, capable of capturing the most important dynamics of hydrogen production process. Among different electrolyser technologies, Polymer Electrolyte Membrane (PEM) seem to be the ideal option for this case, due to the maturity of the technology, better working conditions, fast response and availability in the market. After a comprehensive literature review on the modelling techniques for PEM electrolysers, the next step followed is the study of all chemical and electrical phenomena that take place. The mathematical model is divided in four modules (anode, cathode, membrane and voltage) that are modelled in Matlab Simulink, to study their dynamics. The results generated are compared with current literature for validation. Once the model is validated, different values of stack’s pressures and temperatures are tested to obtain the optimal operation conditions (60ºC and 1 Bar). PEM electrolyser response time is less than 1 s, but the start up procedure may take 10 s. Another fact to consider is that at high current conditions, the electrolyser has loses that are translated in heat (between a 20-10 % of the total power), which could be used in other processes to make the overall efficiency higher. This project aims to present electrolysers as a great storage system for using the surpluses of the gird, because they have a fast response and could be great for improving the efficiency.
MatèriesHydrogen as fuel--Industrial applications, Electrochemistry--Industrial applications, Hidrogen com a combustible--Aplicacions industrials, Electroquímica--Aplicacions industrials
TitulacióMÀSTER UNIVERSITARI EN ENGINYERIA DE L'ENERGIA (Pla 2013)
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