Publication
Model-based control design for H2 purity regulation in high-pressure alkaline electrolyzers
Journal Article (2021)
Journal
Journal of the Franklin Institute
Pages
4373–4392
Volume
358
Number
8
Doc link
https://doi.org/10.1016/j.jfranklin.2021.04.005
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 two control strategies that mitigate the cross contamination of H2 and O2 in a high-pressure alkaline electrolyzer, which consequently increases the supplied gases purity: one based on a decoupled PI scheme and the other based on optimal control tools. In order to reduce the diffusion of gases through the membrane, the controllers establish the opening of two outlet valves based on the pressure of the system and the difference in liquid level between both separation chambers. Therefore, two multiple input - multiple output controllers are designed here. For this purpose, a high-fidelity model previously developed was simplied in order to obtain a control-oriented model. The proposed controllers were evaluated in simulation using the high-fidelity nonlinear model in a wide operating range, which resulted in less than 1% impurity of gases.
Categories
infinite horizon, PI control.
Author keywords
Hydrogen, alkaline electrolysis, multivariable control, H infinite optimal control
Scientific reference
M.R. David, F. Bianchi, C. Ocampo-Martínez and R. Sánchez Peña. Model-based control design for H2 purity regulation in high-pressure alkaline electrolyzers. Journal of the Franklin Institute, 358(8): 4373–4392, 2021.
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