Active Filters

Active power filter continues to attract considerable attention. Because of sensitivity of consumers on power quality and advancement in power electronics. Active power filter technology is the most efficient way to compensate reactive power and cancel out low order harmonics generated by nonlinear loads. An active power filter is a device that is connected in parallel to and cancels the reactive and harmonic currents from the group of nonlinear loads so that the resulting total current drawn from the ac main is sinusoidal. The shunt active power filter was considered to be the most basic configuration for the APF. This project presents 3phase shunt active power filter with uni-polar pulse width modulation technique to make the total input current drawn from the three phase AC main as sinusoidal, by compensating reactive power And low order harmonics generated by the three phase nonlinear loads. The synchronous d-q-o reference frame algorithm is also used to recognize and extract harmonic distortions. The validity of proposed method and achievement of desired compensation are shown by simulation results.