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This paper presents a new control method to compensate the power quality problems through a three-phase unified power quality conditioner (UPQC) under non-ideal mains voltage and unbalanced load conditions. The proposed UPQC system can improve the power quality at the point of common coupling (PCC) on power distribution system A UPQC is a combination of shunt and series APFs, sharing a common dc link. It is a versatile device that can compensate almost all power quality problems such as voltage harmonics, voltage unbalance, voltage flickers, voltage sags & swells, current harmonics, current unbalance, reactive current, etc. In this proposed system the application of fuzzy logic in control of shunt and series active power filters for control of three-phase active power filter. The performance of proposed control system was analyzed using simulations with MATLAB/Simulink program, and experimental results with the hardware prototype.

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M.R. Mohan Raj, M. Dharani, K.Nandhini, P.Pavithran, & P. Rajesh mani. (2017). Matrix converter based power quality enhancement using UPQC . International Journal of Intellectual Advancements and Research in Engineering Computations, 5(2), 1207–1211. Retrieved from