
567Dynamic Simulation and Fuel Cell Control System
be NB (or PB), in order to prevent the continuous increase (or decrease) of
integral term that would cause overshoots. In this case, the change of error
plays little part. The basic control rules are as follows:
If e(k) is PB, then Δu is PB
If e(k) is NB, then Δu is NB
When the output is close to the set point, the change of error must be prop-
erly taken into account in order to ensure stability and speed of response.
The goal of the fuzzy controller is to achieve a satisfactory dynamic perfor-
mance with small sensitivity to parameter variations. The control rules are
as follows:
If both e(k) and ...