document: Fuzzy logic controlled shunt active power filter for power quality improvement The simulation and experimental study of a fuzzy logic controlled , three-phase shunt active power filter to improve power quality by compensating harmonics and reactive power required by a nonlinear load is presented . The advantage of fuzzy control is that it is based on a linguistic description and does not require a mathematical model of the system . The fuzzy control scheme is realised on an inexpensive dedicated micro-controller -LRB- INTEL 8031 -RRB- based system . The compensation process is based on sensing line currents only , an approach different from conventional methods , which require harmonics or reactive volt-ampere requirement of the load . The performance of the fuzzy logic controller is compared with a conventional PI controller . The dynamic behavior of the fuzzy controller is found to be better than the conventional PI controller . PWM pattern generation is based on carrierless hysteresis based current control to obtain the switching signals . Various simulation and experimental results are presented under steady state and transient conditions
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