Power Quality Improvement in Distribution Systems Using a Single-Phase to Three-Phase UPQC

This paper presented the study and the simulation validation of a local three-phase four-wire power distribution system. The system, indicated for applications in rural or remote areas where three-phase distribution grids are not accessible, was conceived based on unified power quality conditioner functionalities. With serial and parallel filtering capability, two inverter topologies were used to compose the UPQC-1Ph-to-3Ph. Thereby, the single-phase series converter was deployed using a half-bridge inverter, while the three-phase parallel converter was implemented using a 3-Leg split capacitor inverter. Using the dual compensation strategy, With Fuzzy Logic Controller the proposed system was able of feeding linear and non-linear three-phase loads acting with universal active filtering capability, i.e., acting as SAPF and PAPF. In addition, a procedure was presented that allows the dimensioning the power structures of the series and parallel converters, under various operating conditions of the utility grid and the load. The good static and dynamic behavior of the UPQC- 1Ph-to-3Ph has been proven through extensive simulation results.

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