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Distributed State Estimation

Presenter : “Dr. A.P. Sakis Meliopoulos”  Georgia Power Distinguished Professor,  Georgia Institute of  Technology


The SuperCalibrator concept was introduced to take advantage of the characteristics of GPSsynchronized equipment (PMUs). Specifically, GPS-synchronized equipment has the capacity to provide precise phase measurements (to 0.01 degrees accuracy) and relatively good quality magnitude measurements (up to 0.1% accuracy). However in a practical environment this precision is not achieved for a variety of reasons, such as errors from instrumentation, system unbalanced conditions, etc. The SuperCalibrator concept is based on a statistical estimation process that fits GPS-synchronized measurements and all other available standard data into a three-phase, breaker-oriented, instrumentation inclusive model. This concept has been extended to provide a decentralized state estimator for power systems. The decentralized state estimator operates on substation data. The resulting substation state estimate is globally valid as long as there is a valid GPS-synchronized measurement at the substation. The presentation describes the SuperCalibartor methodology. Presently the concept is implemented on five substations. Numerical experiments with these systems illustrate the superiority of this approach. The presentation also describes preliminary implementation and performance issues. The implications of the overall approach are substantial.


Prof. A. P. Sakis Meliopoulos was born in Katerini, Greece, in 1949. He received the M.E. and E.E. diploma from the National Technical University of Athens, Greece, in 1972, and the M.S.E.E. and Ph.D. degrees from the Georgia Institute of Technology, Atlanta, GA, in 1974 and 1976, respectively. 
Currently, he is a Professor with the Faculty of Electrical Engineering at the Georgia Institute of Technology, where he has been since 1976. He was with Western Electric, Atlanta, GA, in 1971. He is active in teaching and research in the general areas of modeling, analysis, and control of power systems. He has made significant contributions to power system grounding, harmonics, and reliability assessment. He holds 3 patents; he has published two books, a chapter in the Standard Handbook for Electrical Engineers and over 200 technical papers.
Prof. Meliopoulos is an IEEE Fellow, member of the Hellenic Society of Professional Engineers and member of Sigma Xi.  He has received a number of awards, including the 2005 IEEE Richard H. Kaufmann Award, “For contributions to power system grounding design and testing procedures”, the Sigma Xi Young Faculty award (1981), the outstanding Continuing Education Award, Georgia Institute of Technology (2002), and three of his papers have received the best paper award (IEEE-PES-SC-1984, IEEE-PES-EC-1987, and IEEE-CSS-HICSS 2002).


Prof. Meliopoulos was named Georgia Power Distinguished Professor in 2006.