Control and Integration of a Proton Exchange Membrane Fuel Cell System
Date Issued
2009
Date
2009
Author(s)
Chou, Ming-Cheng
Abstract
This thesis proposes control and integration of a proton exchange membrane fuel cell (PEMFC) system. At first, we assemble a PEMFC system, and find the system characteristics by identification techniques. Finally, we apply various robust control strategies to stabilize output voltage and to increase performance and efficiency of the PEMFC system.rom the system point of view, PEMFC can be regarded as a two-input-two-output system with the inputs of hydrogen and oxygen, and the outputs of cell voltage and current. By fixing the output resistance, the system can be further reduced to a two-input-single-output system. That is, we can either control the cell voltage or current output by regulating the air and hydrogen flow rates. By identification techniques, we find linear models of the PEMFC system at different operating points. And all unmodelled dynamics were considered system uncertainties. Then, we apply robust control strategies to stabilize the system and to increase the system performance.ecause steady power supply is critical for electrical machinery, we aim to maintain steady output voltage. At first, we apply standard robust control design to stabilize the PEMFC system. However, the order of resulting controllers is constrained by the plants and weighting functions. Therefore, we apply fixed-order robust control and robust PID control algorithms to design controllers for a PEMFC. Finally, we evaluate efficiency of the system employing these controllers.
Subjects
Proton Exchange Membrane Fuel Cell (PEMFC)
System Identification
Robust control
Fix-order
Robust PID
Hydrogen efficiency
Type
thesis
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