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Figure 14. THD for id-iq method with fuzzy controller using Matlab and RTDS hardware.

7. Conclusions [5] S. Mikkili, A. K. Panda and S. Yellasiri, “RTDS Hard-

ware Implementation and Simulation of 3-ph 4-Wire

SHAF for Mitigation of Current Harmonics Using p-q

Control Strategy with Fuzzy Controller,” Journal of

Power Electronics & Power Systems, Vol. 1, No. 1, 2011,

pp. 13-23.

In the present paper instantaneous active and Reactive

current control strategy with Fuzzy controller is devel-

oped to mitigate the current harmonics in three phase

four wire system using Matlab/simulink environment and

it verified with Real Time Digital Simulator. This control

strategy is capable to suppress the harmonics in the sys-

tem during balanced sinusoidal, un-balanced sinusoidal

and balanced non-sinusoidal conditions. The p-q control

strategy is unable to yield an adequate solution when

source voltages are not ideal. p-q theory needs additional

PLL circuit for synchronization so p-q method is fre-

quency variant, where as in id-iq method angle “θ” is

calculated directly from main voltages and thus enables

the method to be frequency independent. Thus large

numbers of synchronization problems with un-balanced

and non-sinusoidal voltages are also avoided. Addition to

that DC voltage regulation system valid to be a stable

and steady-state error free system was obtained.

[6] F. Z. Peng, G. W. Ott Jr. and D. J. Adams, “Harmonic and

reactive Power Compensation Based on the Generalized

Instantaneous Reactive Power Theory for Three-Phase

Four-Wire Systems,” IEEE Transactions on Power Elec-

tronics, Vol. 13, No. 5, 1998, pp. 1174-1181.

doi:10.1109/63.728344

[7] V. Soares, P. Verdelho and G. Marques, “Active Power

Filter Control Circuit Based on the Instantaneous Active

and Reactive Current id-iq Method,” IEEE Power Elec-

tronics Specialists Conference, St. Louis, 22-27 June

1997, pp. 1096-1101.

[8] M. I. M. Montero, E. R. Cadaval and F. B. Gonzalez,

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Power Filters in Three-Phase Four Wire Systems,” IEEE

Transactions on Power Electronics, Vol. 22, No. 1, 2007,

pp. 229-236. doi:10.1109/TPEL.2006.886616

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pp. 311-318. doi:10.1109/63.558748

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