Dynamic Voltage Restorer for Power Quality Improvement with D-Q Reference Frame

Abstract

Power Quality problems in the present-day distribution systems are more in these days due to the increased use of sensitive and critical equipment pieces such as communication network, process industries, and precise manufacturing processes. Power quality problems such as transients, sags, swells, and other distortions to the sinusoidal waveform of the supply voltage affect the performance of these equipment pieces. Technologies such as custom power devices are emerged to provide protection against power quality problems. Out of which the series connected type known as DVR can regulate the load voltage from the problems such as sag, swell, and harmonics in the supply voltages in an efficient manner. DVR is controlled by duly employed d-q reference frame strategy. The direct and quadrature axis parameters are set to a standard reference values so as to find if at all there exist any voltage change that may lead to consequences of power quality failure.Unlike the conventional control strategy, a lucid design of direct-quadrature control strategy is used. Hence, it can protect the critical consumer loads from tripping and consequent losses.