Unified Power Quality Conditioner for two feeders in a Distribution System

A UPQC consists of a series voltage-source converter (VSC) and a shunt VSC both joined together by a common dc bus. This paper proposes a new connection for a unified power quality conditioner (UPQC) to improve the power quality of two feeders in a distribution system. It is demonstrated how this device is connected between two independent feeders to regulate the bus voltage of one of the feeders while regulating the voltage across a sensitive load in the other feeder. Since the UPQC is connected between two different feeders (lines), this connection of the UPQC will be called an interline UPQC (IUPQC). This paper gives the structure; control and capability of the IUPQC under some special conditions like sag has been created in feeder 1 and 2 are discussed. The efficiency of the proposed configuration has been verified through simulation studies using MATLAB