Publication
H2 purity control for highpressure alkaline electrolyzers
Conference Article
Conference
IFAC International Symposium on Advanced Control of Chemical Processes (ADCHEM)
Edition
2021
Pages
109-114
Doc link
http://dx.doi.org/10.1016/j.ifacol.2021.08.227
File
Authors
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David, Martín Rafael
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Bianchi, Fernando Daniel
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Ocampo Martínez, Carlos A.
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Sánchez Peña, Ricardo
Projects associated
Abstract
This paper proposes a control strategy that mitigates the cross contamination of H2 and O2 in a high-pressure alkaline electrolyzer, which consequently increases the supplied gases purity. In order to reduce the diffusion of gases through the membrane, the controller establishes the opening of two outlet valves based on the pressure of the system and the difference in liquid level between both separation chambers. Therefore, a multiple input - multiple output optimal controller is designed here. For this purpose, an available high-fidelity model was simplified in order to obtain a control-oriented model. The proposed controller was evaluated in simulation using the high-fidelity nonlinear model in a wide operating range and was compared with a pair of decoupled PI controllers. The resulting impurity of gases was below 1% in all cases.
Categories
automation, control theory, optimisation.
Author keywords
Hydrogen, alkaline electrolysis, H2 purity, multivariable control
Scientific reference
M.R. David, F. Bianchi, C. Ocampo-Martínez and R. Sánchez-Peña. H2 purity control for highpressure alkaline electrolyzers, 2021 IFAC International Symposium on Advanced Control of Chemical Processes, 2021, Venice, Italy, pp. 109-114.
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