This project is very useful in industries to eliminate the harmonics. In
any industries like thermal power plant, hydral power plant the
producing supply is 50 hz frequency a.c supply purely sinusoidal, but it
is reached to our home its become multiple frequency and it creates a
harmonics. using this project we can eliminate the harmonics at the
supply it self, it is possible to reduce the harmonics at the supply
level.because of harmonics lot of losses are developed, because of this
losses reliability is reduced, device life time will be reduces so by
using the active power filter we can reduce the harmonics and maintain
power factor unity. here we are using the hysteresis current controlled
technique to generate the gating signals to turn on the inverter then
inverter acts as a filter than it produces some compensating currents to
canceled out the harmonics.