CLASSIFICATION AND CHARACTERIZATION OF POWER QUALITY PROBLEMS IN THREE PHASE SYSTEM

Abstract

The concern for good power quality is increasing day by day due to the great damage caused by power quality problems in terms of scrambling of data, malfunctioning and failure of the equipment of public or industrial facilities. Hence, to improve the power quality, the detection and monitoring of power quality problems are necessary before taking appropriate mitigating action. To achieve this, the paper presents an algorithm used for the classification and characterization of various categories of voltage sag, swell, interruption, unbalance, under voltage and over voltage problems. The detection is based on the three phase RMS voltages calculated over a window of the half cycle. The RMS voltage samples are given to the program written in MATLAB to classify and characterize the problems. The program outputs are shown for different cases of power quality problems.