| Titre : | Nonminimum-phase phenomenon of PEM fuel cell membrane humidifiers (2008) |
| Auteurs : | Chen, Dongmei, Auteur ; Huei Peng, Auteur |
| Type de document : | Article : texte imprimé |
| Dans : | Transactions of the ASME . Journal of dynamic systems, measurement, and control (Vol. 130 n°4, Juillet 2008) |
| Article en page(s) : | 9 p. |
| Note générale : | dynamic systems |
| Langues : | Anglais |
| Tags : | air flow ; humidifiers ; membranes ; vapors ; temperature ; water ; fuel cells |
| Résumé : | 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-to-output 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. |
| En ligne : | http://dynamicsystems.asmedigitalcollection.asme.org/issue.aspx?journalid=117&issueid=26454 |
