Fuzzy logic controller based instantaneous p-q theory for power quality improvement

This paper gives a solution for suppression in harmonics and compensates the reactive power present in a system. For the study, system considered for analysis is of three phase source feeding power to a non-linear and reactive loads. Diode bridge rectifier acts as non-linear load in parallel with a reactive load connected to the supply. Non-linear load creates problems on power quality and reactive power imbalance is created by reactive load. And, these issues can be mitigated through usage of power filters. Shunt Active Filter (SAF) with instantaneous reactive power control method is adopted in this work to mitigate the power quality issues. To maintain the DC link capacitor voltage constant, fuzzy logic controller is developed. The fuzzy logic controller with the instantaneous reactive power controls the DC link capacitor voltage thus would be helpful to suppress the source harmonics and reactive power compensation.