Improved IUPQC Topology for Simultaneous Compensation of Voltage and Current in Adjacent Feeders

This paper proposes anew connection for a unified power quality conditioner (UPQC) to improve the power quality of two feeders in a distribution system. The interline custom power devices named Interline Unified Power Quality Conditioner (IUPQC) is improved for various power quality disturbances and modeled in MATLAB/SIMULINK by using fuzzy logic controller. The developed topology can be used for simultaneous compensation of voltage and current imperfections in a multibus/multifeeder system. the propped IUPQC is designed for medium voltage s (11kv). Enhanced Phase Locked Loop (EPLL) based control technique is used to detect and extract the PQ problems. The performance of series compensator of IUPQC is evaluated through extensive simulations for mitigating unbalanced voltage sags, voltage swells with phase jumps and interruption. The performance of shunt compensator of IUPQC is also used for harmonic and reactive power compensation that are not investigated before in literature. It is verified that IUPQC which is connected to two feeders can compensate current and voltage distortions successfully.