Study on circuit topology and parameters of three-phase dynamic voltage restorer

The topology of main circuit in three-phase DVR(Dynamic Voltage Restorer) is introduced.Its main circuit parameters are analyzed according to different transformer connections and the influences of different transformer connections on parameters and circuit performance are compared. The Y connection and delta connection of transformer in DVR is simulated with Matlab and the three-phase four-wire structure with Y connection is used in the experiment,which can compensate zero voltage component of source voltage by approved SVPWM algorithm. The analysis and conclusion presented have been verified by the simulative and experimental results. This project is supported by Natural Science Fund of Xi'an Jiaotong University(2002025).