Challenges and Trends in Analyses of Electric Power Quality Measurement Data
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Research Article Challenges and Trends in Analyses of Electric Power Quality Measurement Data Mark F. McGranaghan1 and Surya Santoso2 1 Electric
Power Research Institute (EPRI Solutions), Knoxville, TN 37932, USA of Electrical and Computer Engineering, The University of Texas at Austin, Austin, TX 78712-0240, USA
2 Department
Received 13 August 2006; Revised 13 November 2006; Accepted 13 November 2006 Recommended by Irene Y. H. Gu Power quality monitoring has expanded from a means to investigate customer complaints to an integral part of power system performance assessments. Besides special purpose power quality monitors, power quality data are collected from many other monitoring devices on the system (intelligent relays, revenue meters, digital fault recorders, etc.). The result is a tremendous volume of measurement data that is being collected continuously and must be analyzed to determine if there are important conclusions that can be drawn from the data. It is a significant challenge due to the wide range of characteristics involved, ranging from very slow variations in the steady state voltage to microsecond transients and high frequency distortion. This paper describes some of the problems that can be evaluated with both offline and online analyses of power quality measurement data. These applications can dramatically increase the value of power quality monitoring systems and provide the basis for ongoing research into new analysis and characterization methods and signal processing techniques. Copyright © 2007 M. F. McGranaghan and S. Santoso. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
1.
INTRODUCTION
Electric power quality problems encompass a wide range of different phenomena with time scales range from tens of nanoseconds to steady state. Each of these phenomena may have a variety of different causes and, thus, require different solutions that can be used to improve the power quality and equipment performance. Many power quality (PQ) problems arise from the incompatibility in the electrical environment between the utility supply system and the equipment it serves. There are also PQ problems arising from adverse interactions between the equipment and the supply system. For instance, nonlinear loads are known to produce harmonic currents that can excite the supply system into resonance [1]. The majority of power quality problems can be characterized through measurements of voltage and current. Since PQ disturbances are relatively infrequent and the times at which they occur are unscheduled, continuous measurement or monitoring over an extended period is often required. In addition to characterizing PQ problems, PQ monitoring has been widely used to evaluate system-wide performance (benchmarking). By understanding the normal power quality performance of a system, a utility can identify abnormal
characteristics (may be an indication of eq
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