Improvement of power quality by using hybrid fuzzy controlled based IPQC at various load conditions

Abstract

Dissimilar traditionalistic passive type harmonic power filters, modern active type harmonic power filters have the favorable multiple functions: harmonic filtering, damping, reactive-power control for power factor correction and voltage regulation, load balancing, voltage-flicker reduction etc., This paper presents a hybrid fuzzy logic controlled based improved power quality conditioner used to counterbalance for harmonic distortion in three-phase system. The IPQC employs a very simplest methodology for the calculation of the reference compensation current based on FFT Analysis. The presented improved power quality conditioner is able to operate in different load conditions (balanced, unbalanced, variable). Classical filters may not have adequate performance in fast varying conditions. But auto tuned active power filter gives outperform results for harmonic minimization, reactive power compensation and power factor improvement. The proposed auto tuned shunt active filter maintains the THD well within IEEE-519 standards. The proposed methodology is extensively tested for wide range of different Loads with Improved dynamic behavior of IPQC using hybrid fuzzy logic controller.