Modeling and Control of Hydrogen Systems
| dc.contributor.advisor | Chen, Zheng | |
| dc.contributor.committeeMember | Becker, Aaron T. | |
| dc.contributor.committeeMember | Franchek, Matthew A. | |
| dc.contributor.committeeMember | Grigoriadis, Karolos M. | |
| dc.contributor.committeeMember | Song, Gangbing | |
| dc.creator | Keow, Alicia Li Jen | |
| dc.date.accessioned | 2022-06-19T00:12:21Z | |
| dc.date.created | August 2021 | |
| dc.date.issued | 2021-08 | |
| dc.date.submitted | August 2021 | |
| dc.date.updated | 2022-06-19T00:12:22Z | |
| dc.description.abstract | A metal hydride (MH) hydrogen storage can be charged directly using a proton exchange membrane (PEM) water electrolyzer. The electrolysis process regulates the hydrogen pressure during the charging process. A hierarchical control approach is taken where a higher-level controller determines the desired gas rate for charging, while a lower-level controller tracks this gas generation rate. The low-level proportional-integral (PI) controller is tuned using the relay-feedback auto-tuning approach to adapt to the nonlinear and time-varying dynamics of the electrolyzer. A self-assessment algorithm determines when to activate the autotuner and gain scheduling reduces tuning frequency. This controller is validated on a PEM electrolyzer setup, showing desirable transient behavior at varying operating conditions. The high-level controller adopts the active disturbance rejection control (ADRC) paradigm. ADRC consists of a pressure profile generator, an observer that estimates unmeasurable states, and a controller that produce a suitable gas rate to track the pressure profile. The observer also predicts the state-of-charge (SOC) of the tank. Simulation results show that the ADRC provides good disturbance and noise rejection. Further, this work develops two types of buoyancy control devices. The first system varies its buoyancy using the collection of gases from water electrolysis and the release of stored gases using solenoid valves. The second system varies buoyancy via the gas generation and consumption of reversible fuel cells (RFC), allowing for improved energy efficiency. A dynamic model is constructed for both buoyancy varying systems. The first device is controlled by a proportional-integral-derivative-acceleration (PIDA) controller with its gain identified via the pole placement method. The second device employs a proportional-derivative-acceleration (PDA) controller with gains identified via a relay-feedback auto-tuning method. Finally, the effectiveness of both controllers is confirmed with experiments. | |
| dc.description.department | Mechanical Engineering, Department of | |
| dc.format.digitalOrigin | born digital | |
| dc.format.mimetype | application/pdf | |
| dc.identifier.citation | Portions of this document appear in: A. Keow and Z. Chen, "Auto-tuning Control of PEM Water Electrolyzer with Self-Assessment and Gain Scheduling", Journal of Dynamic System, Measurement, and Control, Vol. 143, Issue 5, p. 051009, May 2021; and in: A. Keow, A. Mayhall, M. Cescon, and Z. Chen, "Active Disturbance Rejection Control of Metal Hydride Hydrogen Storage", International Journal of Hydrogen Energy, Volume 46, Issue 1, pp. 837-851, January 2021; and in: A. Keow, Z. Chen, and H. Bart-Smith, "PIDA Control of Buoyancy Device Enabled by Water Electrolysis", IEEE/ASME Transactions on Mechatronics, Vol. 25, No. 3, pp. 1202 - 1210, 2020; and in: A. Keow, W. Zuo, F. Ghorbel, Z. Chen, "Underwater Buoyancy and Depth Control using Reversible PEM Fuel Cells", Proc. of 2020 IEEE International Conference on Advanced Intelligent Mechatronics, pp. 54-59, Boston, MA, July 6-10, 2020. | |
| dc.identifier.uri | https://hdl.handle.net/10657/9399 | |
| dc.language.iso | eng | |
| dc.rights | The author of this work is the copyright owner. UH Libraries and the Texas Digital Library have their permission to store and provide access to this work. UH Libraries has secured permission to reproduce any and all previously published materials contained in the work. Further transmission, reproduction, or presentation of this work is prohibited except with permission of the author(s). | |
| dc.subject | Metal Hydride Hydrogen Storage. PEM Water Electrolysis, Underwater Buoyancy Control | |
| dc.title | Modeling and Control of Hydrogen Systems | |
| dc.type.dcmi | Text | |
| dc.type.genre | Thesis | |
| dcterms.accessRights | The full text of this item is not available at this time because the student has placed this item under an embargo for a period of time. The Libraries are not authorized to provide a copy of this work during the embargo period. | |
| local.embargo.lift | 2023-08-01 | |
| local.embargo.terms | 2023-08-01 | |
| thesis.degree.college | Cullen College of Engineering | |
| thesis.degree.department | Mechanical Engineering, Department of | |
| thesis.degree.discipline | Mechanical Engineering | |
| thesis.degree.grantor | University of Houston | |
| thesis.degree.level | Doctoral | |
| thesis.degree.name | Doctor of Philosophy |
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