VOLTAGE SAG MITIGATION USING SUPERCAPACITOR BASED DYNAMIC VOLTAGE RESTORER

Nikita Ambade, K. D. Joshi

Abstract: One of the major issues in improving power quality in distribution network is the mitigation of voltage sags which is caused by the system faults and adversely affects the sensitive electrical equipments involved in the end user system. End user system includes industrial production processes and large commercial customers. System faults affect sensitive equipments and result in substantial financial losses. Thus need for introduction of custom power devices emerged. One of these devices is Dynamic Voltage Restorer (DVR) which has excellent dynamic capabilities, installed between supply and a critical load feeder; it compensates voltage sags and restores line voltage to its nominal value. The proposed system comprises of a supercapacitor and the power circuit of the DVR. Thus DVR avoids any power disruption to that load. This paper presents supercapacitor based DVR using Proportional Integral (PI) controller. The system is simulated using PSCAD/EMTDC software. The graphic facility available in this software helps to carry out various aspects of model implementation and simulation results.

Keywords: Power Quality, Voltage sag, Dynamic Voltage Restorer, Custom Power devices, Voltage Source Inverter, PWM

DOI: https://doi.org/10.15623/ijret.2014.0304117