Characteristics and location of the quality control center using three-phase four-wire AC system

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. Characteristics of one possible and simple circuit, which enables us to deliver different power quality level to single-phase loads, are presented. The system can supply three levels of power quality to single-phase loads by use of three-phase four-wire AC system, one inverter and a battery. Finally, for a practical usage of the proposed system, location of the system at some places such as factories and individual houses is presented.