Impact and Simulation of Dynamic Voltage Restorer for Mitigating Voltage Sag

22  Abstract— Loads suffer detrimental effect due to voltage sag which results in economic loss. Dynamic Voltage Restorer (DVR) is of great importance in present power system because of consistent problems related to the power distribution including the voltage sag and voltage swell. Dynamic voltage restorer is a power electronic based device. It protects sensitive loads from the various types of disturbances of the power supply. The basic principle of DVR is to restore the voltage sag to a pre-sag value by injecting a desired value of voltage. Application of this custom power device; a power electronics device makes a remarkable impact. Keywords—voltage sag; voltage swell; dynamic voltage restorer