Abstract
Abstract: This paper figures out the problem of voltage sag and swell and overcome it. The most important aspect of electrical engineering is power quality in the current time. Power quality issues occur to the occurrence of substandard voltage, which may be current and frequency which may be damaged to power system equipment. One of the most important problems is voltage sag and swell. DVR is the device that can easily diminish those problems. DVR model compensates for the voltage sag and swells in an efficient and effective manner due to its lower cost, smaller size, and fast response of disturbance. This paper gives an introduction to the power quality problem and power electronics controllers for voltage sag and swells compensation. Then the operation of DVR is described. Keywords: DVR (Dynamic Voltage Restorer), Microcontroller, Triac, Voltage Sag, and Swell, Power Quality
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