FRIENDS (Flexible, Reliable, and Intelligent Electrical eNergy Delivery System) is proposed as a new con-cept for a future power distribution system. One of the most important characteristics of FRIENDS is that QCC (Quality Control Center) as a power quality control facility is installed very closely to customers in order to supply several qualities of power and enables customers to choose the quality of power. The concept to supply multi-quality of power is called as unbundled power quality service. As one of the configurations of QCCs, unbundled power quality supply system using an inverter with asymmetrical control and three-phase four-wire ac system is proposed by authors. In this paper, total characteristics and realization of proposed system are mentioned by showing experimental and simulation results. The capacity of inverter required to compensate load unbalance and harmonics current is also mentioned.
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Hayashi et al. (2001) studied this question.
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