Design and modelling of dynamic voltage restorer to mitigate voltage sag in an interconnected IEEE-test system

Abstract

The boundaries are set for quality of electrical power that is being supplied to all the electrical power equipment to function properly. If these equipment are exposed to any of the power quality problems then the malfunctioning of the equipment will occur. Different loads will respond differently depending upon the type, duration and severity of the quality problem occurring in the system. Because of this reason the need of study of power quality disturbances is currently under the study of researchers. Different types of power quality problems occur in the electrical power system that depend upon the frequency and magnitude of the voltage. The most common type of voltage magnitude quality problem that occurs in the distribution network is voltage sag. Voltage sag will cause in increase in current and that will eventually damage the load side. In case of sensitive loads the voltage sag mitigation can be done with the help of a Dynamic Voltage Restorer. This research will focus on the Voltage sag mitigation technique in an interconnected system for a sensitive load with the help of a Dynamic Voltage Restorer (DVR). This technique can be used to mitigate the most dangerous Power Quality problems in different sensitive parts of the Power system.