Flexible loop closing control method for an active distribution network based on dual rotary phase shifting transformers

Load transfer without power interruption in the loop closing of an active distribution network is core technology for improving reliability supply. A single rotary phase shifting transformer (RPST) used scenario with a 30° angle difference. However, its regulation mode and cannot realize flexible under any voltage deviation. In this study, dual (DRPST) proposed to achieve function continuously regulating amplitude at point through cooperation rotor angles. This DRPST exhibits advantages control mode, high precision, reliability. First, working principle mathematical model are analyzed accordance topology. Second, difference feedback method both sides based on virtual adopted, reference value synthesis vector obtained by combining deviations. Then, converted decomposed into values angles, realizing non-differential closed double angles coordinated servo motors’ speed. Finally, device capacity 40 kVA developed experiment performed, verifying feasibility effectiveness network.