Applying dynamic voltage restorers（DVR）is an effective way to solve voltage swell or dips

and to improve power quality of customer sensitive load. This paper relies on the system study and testing methods of dynamic voltage restorer which has 10 kV rated voltage and 1 MV·A rated compensation capacity. The analytical study on main circuit topology

choose of energy storage

filter design

control strategy and operation pattern etc is performed. Tests such as compensation accuracy and harmonic

response to voltage fluctuation etc are performed. Test results show that the equipment has an excellent performance

quick response and high accuracy of compensation.