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Fig. 12.5
Membership functions for:
a
SOC.
b
Irradiance.
c
Pressure.
d
PV module temperature.
e
Compromise current.
f
Error signal.
g
Output signal
About the compromise current, the value of 2 A is considered to be sufficient to
start the electrolyzer operation. So around this value two fuzzy subsets have been
defined with Z and S function types and
Low
and
High
labels respectively.
There is an apparent redundancy due to the use of both the irradiance and the
compromise current. The latter one and, so, the error signal are calculated from an
analytically estimated variable (
Ipmax
) and the load current which is empirically
measured. The irradiance serves to compensate any possible mistake committed
during the
Ipmax
determination. Besides, it contributes significantly to design the
fuzzy controller in a more intuitive way.
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