Abstract
This paper illustrates the integration and control of a 500W self-humidified proton exchange membrane fuel cell (PEMFC) system. From the system point of view, the PEMFCcan be regarded as a two-input-two-outputsystem with the inputs of hydrogen and oxygen, and the outputs of cell voltage and current. By identification techniques, we find transfer functions of the PEMFC system at different operating points, and treat the un-modeled dynamics as system uncertainties. In this way, robust control strategies can be applied to stabilize the system and to increase the system performance. This paper describes the design of a standard H ∞ robust controller for stabilizing the PEMFC system, and further applies fixed-order robust control and robust PID control algorithms for controller simplification. Finally, the system performance and efficiency are experimentally verified. The results show the effectiveness of these controllers.
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