Abstract
The voltage and current unbalances are serious power quality problems with interaction on each other and mainly affecting low-voltage electricity distribution three-phase systems. In a three-phase system, the current unbalance is due to load unbalance, while it is considered as the main cause of voltage unbalance. The electricity utilities and distribution network operators are responsible for providing of symmetrical voltages system at the point of common coupling between distribution gird and customers' internal network. The duty of current balancing is solidarity of both of electricity suppliers and customers. The utilities must do it for voltage balancing by equally distribution of single-phase customers between three phases, while three-phase customers have no responsibility for doing it for their single-phase loads. According to this paper, the power quality penalty and unbalanced current-based tariff are innovated for encouraging them to do it like as utilities.
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