Power Quality Improvement by Implementing a Hybrid Analytical Approach for Estimation of Voltage Sag

Abstract

Power quality of delivered power is an anxious issue. Voltage sag is identified as a prevalent power quality issue especially in terms of industrial utilities. Voltage sag is identified by magnitude and duration of sag, so it is essential to enounce a method with which we can identify the sag magnitude more accurately and efficiently. In this paper a comparison is carried out between two of the pre-existing methods namely Root Mean Square Voltage Method and Peak Voltage Method. Each one of the method is implemented on a standard test waveform provided by IEEE working group of power quality event characterization and different parameters of voltage sag are calculated. Effect of size of sliding window in view of point of sag magnitude, initiation and duration is measured. A new hybrid method for calculation of voltage sag magnitude and duration is discussed and implemented on the same test waveform. Results are compared with pre-existing methods. Hybrid method estimate voltage sag duration more accurately.