Shunt Active Filter for Harmonic Compensation Using Fuzzy Logic Technique

Nowadays nonlinear loads are increasing day by day due to industriliasation. Power quality problems increases due to these nonlinear loads. Major power quality problem is the current harmonics. Shunt active filter (SHAF) is used to reduce the current harmonics. Response and the accuracy of filter depends on the method used for the extraction of reference current. A new topology has been proposed in this this paper to minimize the current harmonics by controlling shunt active filter using fuzzy logic controller (FLC) with instantaneous active and reactive current theory (i
_d
and i
_d
) within the limit of IEEE Std. 519. Under different supply voltage conditions simulation is done with fuzzy logic controller and synchronous reference frame technique. To analyze the performance of SHAF three phase four wire (3P4W) system is considered. Simulation result shows that Fuzzy controller technique gives the best performance under balanced and unbalanced voltage conditions.