In this paper a three-phase shunt active filter is used to eliminate supply Current harmonics, correct supply power-factor, for balanced nonlinear load. The active power filter produces equal but opposite harmonic currents to the point of connection with the nonlinear load. This results in a reduction of the original distortion and correction of the power factor. A three-phase insulated gate bipolar transistor based current controlled voltage source inverter with a dc bus capacitor is used as an active filter. The firing pulses to the shunt active filter will be generated  by using sine PWM method. The models for three-phase active power filter controller for balanced and unbalanced non-linear load is made and is simulated using Matlab/simulink software. The proposed active power filter can largely reduce the total harmonic distortion of current and correct the power factor to unity with balanced and unbalanced nonlinear load

Keywords: Active power filter, Harmonics