Abstract: Harmonic injection in supply current is most common problem arising in supply network because of the increased population of nonlinear loads. This paper present a comparative study between two different control strategies to determine the compensating currents for a three phase three wire Shunt Active Power Filter(SAPF). The first strategy is based on the instantaneous real and imaginary powers theory known as p-q theory, the second is Generalized Instanteneous Power Theory(GIPT). The two control strategies are applied to a three-wire shunt active power filter for eliminating load current harmonics, reactive power compensation and load balancing. The validity of the proposed control scheme is verified by the simulation study.

Keywords: Active Power, Harmonic Elimination, Non-linear load, Load Balancing.