Mitigation of voltage sags/swells unbalanced in low voltage distribution systems

The main problems of the power quality like voltage sags/swells in low voltage distribution systems and on the transmission side due to sensitive loads, the terminology used for the compensation devices is different. Dynamic Voltage Restorer (DVR) is one of the equipments for voltage disturbance mitigation in power systems. It is installed between the incoming supply and the sensitive loads to maintain the voltage at the sensitive load from balance. This paper proposes a mitigation of voltage sags/swells in low voltage distribution system using an effective series compensator (DVR). The compensator should protect sensitive loads against of voltage sags/swells. Performance of the proposed method is investigated under different types of fault in both single phase and three phases for various sensitive load conditions. The simulation was carried out with the help of SIMULINK & MATLAB and the results show appropriate operation of the proposed control system. Keyword: Power quality, voltage quality, DVR, voltage disturbance, FACTS.