![](bg6.png)
Figure 15 gives information that THD current
decreased from 5.38% to 2.92 %. According to the
IEEE 519 standard, this signal was within the
standard.
Figure 16: The current signals resulted by NN
controller.
The current signals in Fig.14 were also controlled
by NN controller and the results can be seen in the
(Fig.16). From the figure, it can be seen that the THD
current decreased to 1.56 %. This simulation has also
proved that the NN controller gives better
performance than PI controller does. In this case, the
PI controller can decrease signal by 45.72 % while
NN controller can decrease THD level by 71%.
5 CONCLUSION
From the simulation results provided in section 3,
it can be concluded that the proposed methods, abc-
dq frame transformation and NN controller of Active
Harmonic Filter, have better performance in
comparison to PI controller of active Harmonic
Filter. In the voltage cases, the PI controller can
reduce THD by 33.16 % while NN controller can
reduce by 34.95 %. In other hand, in the current cases,
the PI controller can reduce THD current by 45.72%,
while the NN controller can reduce by 71%.
According to these data, the proposed method is
recomended as method for reducing THD, either
THD voltage or THD current.
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