European Journal of Scientific Research - EuroJournals

A Predictive Current Control Technique on Fuel Cell Based Distributed
Generation in a Standalone AC Power Supply 898
by considering the required current of IF2(n+1) in (17), we achieve the remaining required current of load
as:
I B 2( n + 1) = I F 2( n + 1) −I
Max _FC
(24)
By having the value of IB2(n+1), we can get DB(n) with the way presented before as:
n2
I B1( n + 1) = IB 2(
n + 1)
n1
(25)
n1
V ′ ab 2 = Vab
2
n2
(26)
I ( n + 1) −I
( n)
L + R I ( n) + V ′ ( n) + V
DB( n)
= T
2 V
B1 B1
t t B 1 ab 2 battery
battery
(27)
That, Lt and Rt are the transformer’s impedances.
According to the mentioned above, we can extract the recommended algorithm as Fig. 6. The
illustrated flowchart shows the performance of suggested algorithm so well. Consequently, after
employing this algorithm and also by fixing the capacitor’s voltage in 1 p.u., we would be able to feed
the power of three phase loads by a three phase converter, with PWM switching technique (such as
Fig. 3).
Figure 6: DC link capacitor's voltage controlling flowchart with fuel cell and backup battery.