A. P. Sakis Meliopoulos

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This paper presents the application of the virtual test bed for visualization and animation of protective relaying problems. The development of protective relaying animation and visualization objects as well as the interfacing with the virtual test bed is described. Two examples of protective relaying animation are presented: (a) modified mho relays and (b)(More)
– Control room operators are faced with frequent security-economy decision-making situations necessitated by stressed system operating conditions, and there is increased need for security-economy decision-support tools. Although probabilistic methods are promising in this regard, they have been mainly used in planning environments. This task force paper(More)
Present state estimator performance is not 100% reliable. Specifically, there is significant probability that the state estimators may not converge to an acceptable solution. On an industry wide basis, the probability of non convergence is about 5%. The reasons for this performance have been investigated and have been reported in earlier papers. In this(More)
In a deregulated environment, independent generators and utility generators may or may not participate in the load-frequency control of the system. For the purpose of evaluating the performance of such a system, a flexible method has been developed and implemented. The method assumes that load frequency control is performed by an ISO based on parameters(More)
GPS-synchronized equipment (PMUs) is in general higher precision equipment as compared to typical SCADA systems. Conceptually, PMU data are time tagged with accuracy of better than 1 microsecond and magnitude accuracy that is better than 0.1%. This potential performance is not achieved in an actual field installation due to errors from instrumentation(More)
State estimation has been introduced to power systems and implemented in the 60s, using a single frequency, balanced and symmetric power system model under steady state conditions. This implementation is still prevalent today. The single frequency, balanced and symmetric system assumptions have simplified the implementation but have generated practical(More)
The evolution of software engineering, multitasking environment, object oriented programming and symbolically assisted simulation methods have enable the creation of interactive simulation environments that come close to providing a virtual experience of the actual system. The initial attempts at utilizing this technology are impressive and yet the degree(More)