This paper deals with the power quality condition which is the integration of the series active and shunt active filter the main concept is that while considering the harmonic distortion or the voltage mitigation problem of the device UPQC usually compensate various element of the power system which has a negative impact on the system by eliminating it UPQC is a reliable device due to its nominal cost and fast response with low error handing capabilities. Whenever we consider any transmission and distribution system there are many electrical loads which are very important for the facing of the voltage variation .This paper present a novel method through which we will developing a control method for shunt active filter and PQ theory based control technique for series active filter to compensate power problem in a 3 phase four wire UPQC .The purpose UPQC will improve the power quality of power distribution system under balanced and distorted load condition. The control scheme used is the hysteresis voltage controller by using a-b-c to d-q transformation.
UPQC, power factor, voltage sag and voltage swell, APF (active power filter), PQ, power quality, SAF (Shunt active filter), VSC (Voltage source converter)
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