Power Quality Monitoring and Analysis: An Overview and Key Issues

Power quality (PQ) issue is rising due to more penetration of power electronics derives used for improvement in the efficiency, control etc. The ongoing regulatory policy and structural changes in the electricity industry all over the world have also contributed toward major concern of PQ, making it a figure-of-merit amongst the competing distribution utilities. In this stduy, a comprehensive overview of different PQ problems, their cause, effects and suitable existing remedies has been presented. Various standards evolved to define and characterize different PQ problems as well as voltage acceptability curves proposed to quantify PQ are critically reviewed. Need objective or requirement and challenges of intelligent monitoring system using advanced signal processing and artificial intelligence tools for detection and classification of PQ disturbances have also been critically examined in this stduy. Advanced and powerful tools for the analysis, operation and control of power systems, as well as for PQ diagnosis are currently available. A comparative study has been carried out on the applicability of the state of the art techniques for assessment and analysis of PQ, which include both nonparametric decomposition based and model based techniques. Major Key issues and challenges in analyzing PQ are also outlined.