• Darshini Muralidhara
• K P Shobha

Active harmonic filters (AHFs) are devices that can mitigate harmonic distortion and improve power quality in electrical systems. This paper compares two popular control methods for AHFs: the instantaneous real and imaginary power theory (PQ) and the synchronous reference frame method (DQ). The performance of both methods is evaluated in terms of harmonic compensation, reactive power control, and voltage regulation under different load and source conditions. The simulation results show that the DQ method has better dynamic response and stability than the PQ method, especially under unbalanced and distorted source voltages. The DQ method also requires less computational effort and tuning parameters than the PQ method. The paper concludes that the DQ method is more suitable for AHFs in modern power systems with nonlinear and variable loads.

Active harmonic filter, Park transformation, PQ theory, DQ Control.

"Comparative Study of PQ theory and DQ Control Method for Shunt Active Harmonic Filter", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.11, Issue 1, page no.e556-e565, January-2024, Available :http://www.jetir.org/papers/JETIR2401466.pdf

"Comparative Study of PQ theory and DQ Control Method for Shunt Active Harmonic Filter", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.11, Issue 1, page no. ppe556-e565, January-2024, Available at : http://www.jetir.org/papers/JETIR2401466.pdf