Development of a controller for voltage stabilisation in fuel cells using an electric field modifier (EFM) electrode
Publication date
2024
Document type
Konferenzbeitrag
Author
Organisational unit
Conference
8th International Hybrid Power Plants & Systems Workshop (HYB 2024), 14-15 May 2024 ; Azores, Portugal
Book title
8th International Hybrid Power Plants & Systems Workshop (HYB 2024)
First page
164
Last page
171
Peer-reviewed
✅
Part of the university bibliography
✅
DDC Class
620 Ingenieurwissenschaften
Keyword
Electrochemical impedance spectroscopy
Electrochemical electrodes
Proton exchange membrane fuel cells
Equivalent circuits
Abstract
The present work expands on the idea of the electric field modifier (EFM) as a control electrode in the membrane of a fuel cell (FC). Through electrochemical impedance spectroscopy (EIS) measurements it is shown experimentally that an EFM-electrode made of a gold mesh can be integrated into a fuel cell, without disrupting its function. Using the measured impedance spectra and a distribution of relaxation times (DRT)-approach a suitable equivalent circuit (EQC)-model is derived for the measured cell with the integrated EFM. Further measurements show that the EFM can mainly be regarded as a double layer (dl)-capacitor inside of the membrane. This capacitor, in conjunction with a specially designed H∞ -controller are used in a simulation to stabilise the cell voltage, while a square wave current is drawn from the cell, to represent a direct connection of the FC with an inverter. The system is shown to have excellent disturbance rejection.
Version
Published version
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