Electrochemical Low-Frequency Impedance Spectroscopy for Diagnostics of Fuel Cells
- Resource Type
- Conference
- Authors
- Zenith, Federico; Halvorsen, Ivar J.; Pivac, Ivan; Bezmalinovic, Dario; Barbir, Frano
- Source
- 2019 IEEE Vehicle Power and Propulsion Conference (VPPC) Vehicle Power and Propulsion Conference (VPPC), 2019 IEEE. :1-5 Oct, 2019
- Subject
- Aerospace
Communication, Networking and Broadcast Technologies
Components, Circuits, Devices and Systems
Power, Energy and Industry Applications
Robotics and Control Systems
Signal Processing and Analysis
Transportation
Relays
Fuel cells
Impedance
Mathematical model
Voltage measurement
Resistance
Degradation
- Language
Diagnostics of the state of health of fuel cells is important for their safe operation and to maximise their lifetime. The low-frequency intercept of a fuel cell's electrochemical impedance spectrum with the real axis is a good prognostic variable that changes linearly with degradation. Using relay feedback, it is possible to estimate this parameter on-line without a full impedance spectroscopy, with a lightweight algorithm that can be realised with a typical fuel cell control unit. The proposed method is tested in simulations and experiments, and demonstrated convergence times of just a few seconds.