Analysis of Three-Winding Transformer Configurations for Energy Storageless Dynamic Voltage Restorer

Dynamic voltage restorer (DVR) is considered as one of the best and cost-effective solution in addressing the power quality concerns in distribution systems. The integration of DVR with the reliable grid eliminates the need for external energy storage unit and can address the issue of compensating long/deep voltage sags. In this paper, a new topology, wherein the DVR taps in energy through a three-winding transformer connected to the grid is proposed. As different configurations are available for three-winding transformer, detailed analysis is conducted to find the best possible configuration of the three-winding transformer for a DVR integrated system. The studies are carried out in MATLAB/Simulink platform and the results are presented.