Energy Storage System Based Dynamic Voltage Restorer Framework to Improve Power Quality of the Distribution Grid

Abstract

Quality of the output power delivered from the utilities has become a major concern of the modern industries for the last decade. These power quality associated problems are voltage sag, surge, flicker, voltage imbalance, interruptions and harmonic problems. To overcome the problems caused by customer side abnormalities so called custom power devices are connected closer to the load end. One such reliable customer power device used to address the voltage sag, swell problem is the Dynamic Voltage Restorer (DVR). It is a series connected custom power device, which is considered to be a cost effective alternative when compared with other commercially available voltage sag compensation devices. With the integration of ultra-capacitors (UCAP) with the DVR&Fuzzy Logic Controller (FLC), the UCAP-DVR system will have active power capability and will be able to independently compensate temporary voltage sags and swells without relying on the grid The proposed system helps in providing a stiff dc-link voltage, and the integrated UCAP-DVR-FLC system helps in compensating temporary voltage sags and voltage swells. The MATLAB/SIMULINK power system tool box has been used to develop the proposed system.