Simulation of Shunt Active Filter

This paper presents a simple control algorithm for a shunt active filter for compensation of harmonics under non sinusoidal supply conditions. Under non sinusoidal Supply conditions, any attempt to achieve unity power factor results in a non- sinusoidal Current, which increases the total harmonic distortion (TFID). On the other hand, any attempt at getting harmonic free current may not yield unity power because of the harmonics present in the voltage waveform. The proposed algorithm optimizes this tread-Off using Lagrange multiplier technique and achieves the best compromise. It does not employ the normally used p-q theory and is applicable to both single phase and three phase Systems.