Digital Simulation of Dynamic Voltage Restorer (DVR) for Voltage Sag Mitigation

The dynamic voltage restorer (DVR) as a means of series compensation for mitigating the effect of voltage sags has established as a preferred approach for improving power quality at sensitive load locations. Mean while, the cascaded multilevel type of power converter topology has also become a workhorse topology in high power applications. This paper presents the simulation on a closed loop regulator to maintain the load voltage within acceptable levels in a DVR using transformer coupled H- bridge converters. This paper presents system operation and controller design approaches.