Voltage Quality Identification and Mitigation using Simple PI Based ABC Controlled DVR in Distribution System

The most noticeable topic for Electrical Engineering is power quality in recent years. Power quality problem is an occurrence manifested as a nonstandard voltage, current or frequency. Utility distribution networks, sensitive industrial loads andcritical commercial operations suffer from various types of outages and service interruption can cost significant financial losses. One of the major problems dealt hereis the voltage sag and swell. The fast development in power electronics technology has made it possible to mitigate power quality problems. The work presented in this paper is confined to voltage quality identification and mitigation for sag and swell. The work carried out concentrates on the development of simple RMS algorithms for identification of voltage quality problems and development ofsimplified suitable devices for mitigation of voltage sag and swell. Many of the suitable devices such as D-STATCOM, UPQC and DVR are available to mitigate voltage sag and swell problems. Among these, Dynamic Voltage Restorer (DVR) canprovide the most commercial solution to mitigate voltage sag by injecting voltage aswell as power into the system. Dynamic Voltage Restorer is a series connected powe relectronics based device that can quickly mitigate the voltage sag and swell in the system and restore the load voltage. Energy storage device used in this work isBattery for DVR and it is responsible for supplying active power needed during voltage sag and swell. simpleabc control algorithm which is to utilize the error signal to control the triggering of the switches of an inverter using Pulse Width Modulation (PWM) technique. Modeling and simulation of proposed DVR control is implemented in MATLAB /SIMULINKsoftware and results are presented.