Comparative Assessment for Power Quality Improvement Using Hybrid Power Filters

Nowadays, power quality is one of the sensitive issues considered in power system. In order to develop this superiority of power, the disturbances present in the signal have to be eliminated. This disturbance is nothing but the harmonics which was traditionally filtered out by the use of passive filter, and later on it claims superiority by use of active power filter due to certain problems raised in passive filters like resonance and fixed compensation. Particularly, the hybrid active power filter is used to eliminate the harmonics present in the fundamental signal and also compensates reactive power. In this paper, methods like instantaneous power theory (p-q) and synchronous reference frame theory (id-iq) are used to calculate the compensating current. Both the above methods are simulated with help of PI and fuzzy controller for different voltage conditions. The obtained results show the active behavior of fuzzy logic controllers over PI controllers.