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Load Current (Phase A)
20
0
-20
Source Current (Phase A)
40
20
0
-20
-40
Filter Current (Phase A)
10
0
-10
DC Link Voltage & Ref. Voltage
700
680
660
0
0.05
0.1
0.15
0.2
0.25
0.3
0.35
0.4
0.45
0.5
0.55
0.6
0.65
Time (sec)
Fig. 13 Dynamic response of shunt APF with 49-rule FLC using Gbell MFs
establish that in this case triangular MFs based FLC has a slightly upper edge over
Gaussian MFs based FLC.
However, the Gaussian MFs based FLC exhibits better harmonic compensation
performances than triangular MFs based FLC during transient as well as steady-
state operation. The harmonic compensation performance of other two MFs, i.e.,
Gbell and Dsig is also comparable with that of Gaussian MFs but suffers on account
of inferior dynamic response in terms of settling time.
In Case-2, both, the triangular MFs based FLC performs better in terms of
dynamic response, while Gaussian MFs based FLC exhibits better harmonic
compensation capabilities.
4.3 Case-3: Load Perturbation Response Followed by Sudden
Increase in Load
At t = 0.45 s, a change in loading condition makes the load current to increase from
6.95 to 9.26 A (rms). The effect of this load change on the responses of various
controllers regulating theDC link capacitor voltage is shown in Figs. 12 , 13 , 14 and 15 .
 
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