Design of dynamic voltage restorer with disturbance-filtering enhancement

In this paper, a new approach for the design of dynamic voltage restorer is proposed. By installing the filtering scheme at utility side and load side, the designated dynamic voltage restorer not only effectively compensates the voltage disturbances, but also helps ensure the supplying power quality. To validate the effectiveness of the method, several disturbance scenarios including voltage sag, oscillatory transients and power surges were examined in the simulation study. This is further supported through the hardware realization of the proposed design, where experimental results obtained under load change and voltage distortion scenarios were both investigated. Test results revealed that the proposed method is able to withstand possible disturbances at a faster dynamic response, thereby consolidating the feasibility and practicality of the approach for the applications considered.