Recent advances in power electronics have stirred the interest in active power filter (APF) for harmonic distortion mitigation in power systems. The objective of active power filter is to compensate the harmonic currents produced by the non-linear loads to ensure the sinusoidal currents and voltages to improve power quality. Particularly, in control of Shunt active filter good extraction of harmonic currents and injection to the grid decides the quality of active filtering. Among, the existing extraction methods time domain approaches draws significant importance because of features such as...