Configurations of AC and DC-type Quality Control Center for a New Distribution System FRIENDS

Unbundled power quality service is paid much atten­tion under the circumstances of deregulation and diversifi­cation of needs of customers for quality and price of elec­tric power Moreover, distributed generators (DGs) such as photovoltaic generations and wind turbines will be intro­duced to distribution system more and more, and reverse flow of active power has possibility to cause new problems in the distribution system such as voltage rise of distribution line and protection problem Flexible, Reliable and Intelligent Electrical eNergy Deliv­ery System, which is called FRIENDS, has been proposed as one of promising distribution system for such requirements, and intensive studies are under way One of features of the system is introducing Quality Control Center (QCC) into the system for unbundled power quality service and easy in­stallation of DGs Two types of QCCs for such purposes are proposed, and simulation results are shown in this paper.