Supply current and load voltage distortions suppression using the unified power quality conditioner

A straightforward approach to suppress three-phase supply current and load voltage distortions is presented. This latter uses the unified power quality conditioner (UPQC) topology made up of a hybrid active power filter (APF) combination based on a series APF, sharing a common DC voltage with a parallel APF, and passive filters. Supply current distortion is introduced by connecting a non-linear load, while load voltage distortion occurs after adding 5^th and 7^th harmonics to the AC main voltage. The series APF controller forces load voltage to be sinusoidal, whereas parallel APF and passive filters counter harmonic contents from supply current. A model established under Matlab-Simulink software shows the performance of such approach.