Abstract:
This paper presents a double closed-loop controller for
a proton exchange membrane fuel cell (PEMFC) power
system. which consists of a PEMFC stack, a controller,
an AC-DC and DC-AC converter with the function of
uninterruptible power system (UPS). According to the
output voltage and current values which are feedback
variables in the system, an optimizing fuzzy-PI controller
has been designed to mainly control the hydrogen and
air/oxygen mass flows, and auxiliary variables, such as
the temperature, pressure, humidity of the membrane.
and proportion of stoichiometry. Experimental results
show that the optimized fuzzy-PI controller can improve
the voltage and current performance of the system.
