Abstract

FACTS devices such as Static Synchronous Compensator (STATCOM), Static Synchronous Series Compensator (SSSC), and Unified Power Flow Controller (UPFC) etc are designed for improving power quality in the transmission system. But these devices are now modified to be used in the distribution system rated from 1 to 38kV for the improvement of power quality and known as Custom Power Devices (CPD). The main custom power devices are Distribution Static Synchronous Compensator (DSTATCOM), Dynamic Voltage Restorer (DVR) and Unified Power Quality Conditioner (UPQC). Among these devices DVR can work as a harmonic isolator to prevent the harmonics in the source voltage reaching the load in addition to balancing the voltages and providing voltage regulation that facilitates to use it against power quality problem like voltage sag. This paper presents implementation and control of a low voltage Dynamic Voltage Restorer (DVR) using Park's Transformation in MATLAB Simulink for minimizing voltage sag problem in distribution system.

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