Reza Sedaghati - Sama technical and vocatinal training college, Islamic Azad University, Kazeroon Branch, Kazeroon, Iran

Power quality has become an increasingly important topic in the performance of many industrial applications. One of the major issues in improving power quality in distributionnetworks is the mitigation of voltage sags. Voltage sag can be mitigated by voltage and power injections into the distribution system using Dynamic Voltage Restorer (DVR). The DVR is a powerful controller that is commonly used for voltage sags mitigation at thepoint of connection. This paper describes of modeling and analysis of DVR. Different types of faults are applied for DVR in distribution network and the responses of the system for these disturbances are examined. Simulation results obtained in PSCAD/EMTDC alsoprove that the DVR can mitigate voltage sag and protect bus bar voltage from various typesof faults.

Dynamic Voltage Restorer, Voltage Sag, PWM, Fault