Nonminimum-Phase Phenomenon of PEM Fuel Cell Membrane Humidifiers | Zendy

Dongmei Chen | Zendy; Huei Peng | Zendy

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Nonminimum-Phase Phenomenon of PEM Fuel Cell Membrane Humidifiers

Author(s) -

Dongmei Chen,

Huei Peng

Publication year - 2008

Publication title -

journal of dynamic systems measurement and control

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.528

H-Index - 89

eISSN - 1528-9028

pISSN - 0022-0434

DOI - 10.1115/1.2936381

Subject(s) - control theory (sociology) , loop (graph theory) , zero (linguistics) , proton exchange membrane fuel cell , phase (matter) , volumetric flow rate , steady state (chemistry) , backflow , engineering , computer science , fuel cells , mechanics , control (management) , mathematics , inlet , physics , chemistry , mechanical engineering , linguistics , philosophy , combinatorics , quantum mechanics , artificial intelligence , chemical engineering

A membrane-based humidifier that uses cooling water of a fuel cell system to humidify the inlet air is modeled and analyzed in this paper. This four-state lumped model is simple and yet captures the humidification behavior accurately. A peculiar characteristic of this system is the fact that it exhibits nonminimum-phase (NMP) behavior. The reason the NMP behavior exists and the effect of system parameters on the location of the NMP zero are analyzed. A proportional control algorithm is proposed to reject the effect of system disturbances, and a feed-forward algorithm is developed to ensure proper humidifier operation under air flow rate changes. Because the NMP zero exists in the disturbance-tooutput loop, the proposed algorithm was found to successfully eliminate the undershoot phenomena associated with the NMP zero. However, the disturbance-to-output loop is coupled with input-to-output loop, and the NMP zero could affect the feedback control design. DOI: 10.1115/1.2936381

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