Voltage Unbalance Compensation in Distribution Feeders Using Soft Open Points

Soft open points (SOPs) are power electronic devices that may replace conventional normally-open in distribution networks. They can be used for active flow control, reactive compensation, fault isolation, and service restoration through network reconfiguration with enhanced operation flexibility grid resiliency. Due to unbalanced loading conditions, the voltage unbalance issue, as a common problem networks, has negative impacts on operation. In this paper, control strategy of compensation feeders using SOPs is proposed. With three-phase current regulated simultaneously mitigate between neighboring where installed. Feeder among three phases compensated injection negative-sequence zero-sequence from SOPs. Especially response outages, isolated loads balanced by connected under faults, even if unbalanced. A MATLAB/Simulink model IEEE 13-bus test feeder an SOP across ends implemented, experimental tests hardware-in-the-loop platform implemented validate effectiveness proposed strategy.