Process for operation of a pem fuel cell unit

H - Electricity – 01 – M

Patent

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H01M 8/04 (2006.01) B60L 11/18 (2006.01)

Patent

CA 2267430

This invention concerns a process for oper- ating a PEM fuel cell system (2) with at least one PEM fuel cell block (4) and an upstream compres- sor (8) the rotational speed of which is controlled. To regulate the electrical current I of the PEM fuel cell block (4) to a new set value I SN, in a first step, the rotational speed (n) of the compressor (8) is set at a maximum value n M and, in a second step, re- duced to a rotational speed n SN which corresponds to the new set value I SN. These measure provide improved dynamics for brief and rapid changes in load.

L'invention concerne un procédé permettant de faire fonctionner une installation à piles à combustible à membrane électrolytique polymère (2), comprenant au moins un bloc de piles à combustible à membrane électrolytique polymère (4) et un compresseur (8) monté en aval dont la vitesse de rotation est régulée. Pour réguler le courant électrique I du bloc de piles à combustible à membrane électrolytique polymère (4) à une nouvelle valeur de consigne ISM, la vitesse de rotation (n) du compresseur (8) est, dans une première étape, réglée à une valeur maximum nM et, dans une seconde étape, réduite à une vitesse de rotation nSN qui correspond à la nouvelle valeur de consigne ISN. Ainsi, on obtient une dynamique améliorée pour des variations de charge brèves et rapides.

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