Fuzzy Double Model Control for Air Supply on a PEM Fuel Cell System - Intelligent Computing for Sustainable Energy and Environment - page 399

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4

Fuzz y Double M odel Control
Fu z zy PID

2

0

1000

500

0

100

50

0

40

35

30

25

20

0 2.5 5 7.5 10 12.5 15 17.5

t (s)

Fig. 7. Oxygen excess ratio, output power of PEM fuel cell, and compressor voltage
curves under control with load current changed

of fuzzy model control. This is helpful for safety and ecient operation of the
PEM fuel cell under the load current changes.
It is also shown form Figure 7 that the fuzzy double model control has the
better control effect than traditional fuzzy PID control in regulation time, and
which could make the fuel cell system into the optimal operational state within
the less time.

5 Conclusions

In this paper an innovative fuzzy double model control for controlling the oxygen
excess ratio has been proposed. The strategy contains the fuzzy control, PID
control and the method used to switch the control model between PID and fuzzy
control based on the fuzzy inference rules. The proposed fuzzy model control is
relatively simple ,and the simulation results show that this control strategy has
the better control effect than traditional fuzzy PID control in regulation time.
However, the algorithm also needs to be evaluated and complemented in the real
PEM fuel cell system, which is our future work to be done.

Acknowledgments. This research has been supported by the Nation Natu-
ral Science Foundation of China under Grant No. 61064003 and the Project of
Commission of Finance of Gansu Province, China under Grant No. 1103ZTC143.