Non-linier loads such as diode or thyristor rectifier (for example on vacuum casting induction furnace) can be made the current wave become non sinusoidal, and can cause on decrease of the power quality on the utility or in the electric power system. In addition, the distortion become so serious for 5th and 7th harmonic because of the negative effect on the electric tool. The harmonic damping is the right choice to reduce the voltage and current harmonics. This research focuses on the Active Filter that is being chosen for reducing the harmonics. The method can be prove well by used Band Pass Filter 2nd Order and Proportional Integral Controller. With load such as Vacuum Induction Furnace 9 kW, 13.8 kVA, 200V, 3 Ph, 50/60 Hz, we have %ITHD for 5.14% and %VTHD for 3.82%, suited with %THD standard.