Load voltage regulation and line loss minimization of loop distribution systems using UPFC

This paper presents a new method for achieving line loss minimization and voltage regulation in the loop distribution systems, simultaneously. First, the fine loss minimum conditions in the loop distribution systems are presented. Then, load voltage regulation by using the shunt compensation is presented. In order to achieve these two objectives, simultaneously, the unified power flow controller (UPFC) is used. The UPFC shunt converter is used as a shunt compensator to regulate the load voltage, and the UPFC series converter is used to control the power flow to achieve line loss minimization. Also, the proposed control schemes of the UPFC series and shunt converters are investigated. The effectiveness of the proposed control schemes of the UPFC has been verified experimentally using laboratory prototype in a 200 V, 6 kVA system.