Voltage control on unbalanced LV networks using tap changing transformers

This paper investigates how an on-load tap changer (OLTC) can be used to regulate the unbalanced three-phase voltages when single phase unbalanced loads are connected to a radial LV distribution feeder. An overview of current voltage regulation technologies for distribution network is presented. Two voltage regulation strategies are developed to eliminate the effect of the unbalanced single phase loads and provide a balanced three-phase supply for the downstream loads. In PSCAD, these two strategies are modelled and examined in several scenarios, based on which, a comparison between their performances is given.