A survey on control strategies of dynamic voltage restorer

With the development of information and automation techniques, dynamic voltage problems are once again in the spotlight. As an important custom power device, DVR is powerful in solving these power quality problems. In order to propel the further study of DVR, the main methods and achievements of DVR in control strategy of inverter and rectifier, are surveyed in this paper after investigating a large amount of DVR references in conferences and science periodicals. After introducing the operation principles and structures of DVR, the paper emphasizes on the latest study results. Abundant charts and figures are employed to demonstrate the advantages and disadvantages of control strategies in DVR. Meanwhile the application future of DVR in power system and several problems which need to solve are proposed.