Proposal of the advanced control scheme of quality control center in flexible, reliable and intelligent electrical energy delivery system

The authors have proposed the flexible, reliable and intelligent electrical energy delivery system, FRIENDS, as one of the future electric power distribution systems. In order to realize FRIENDS, it is indispensable to design the interior structure of the key facility called quality control center. The authors have proposed the low voltage side interior structure of QCC based on the concept of UPS from the viewpoint of realizing the customized power quality supply. This paper proposes the advanced control scheme that can realize not only customized power quality supply but also compensation for the effect caused by the unbalanced three phase loads. This paper also confirms the validity of the proposed control scheme through momentary analysis using PSCAD/EMTDC