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Although nowadays, within the transmission system smart grid efforts, new DSP (Digital Signal Processing) based ultra-fast remote terminal units (known as PMU) are increasingly installed in the power systems, the use of their data is mostly limited to phasor visualization at the system control centre. Within the steady state domain, their first practical use might be within the state estimation (SE) application of the classic SCADA/EMS system. This can be justified due to the importance of SE for all of the real time/study network applications. Due to their high accuracy and existence of phase angle measurements, PMU measurements offer a potential benefit to the quality of state estimation solution. In Serbian TSMO, a new WAMS system has been implemented with PMU devices installed during the Project phase in several substations. Two classical SCADA/EMS systems are in operation in the Serbian TSMO NCC, where one serves as a primary, while the second one is a backup for SCADA/EMS, but at the same time it serves as a primary one for SMM Block load frequency regulator. The backup system is open for upgrade, so the State Estimator has Miloš Stojić, Jelena Veselinović, Ninel Čukalevski, Goran Jakupović Inclusion of Phasor Measurements in the State Estimator... 65 been modified to include voltage phase angle measurements, using approach with no reference bus specified. The influence of phase angle measurements on state estimation accuracy has been investigated, using system snapshots taken from the real-time system. The results of this study and practical consequences for the Serbian TSMO NCC will be presented in this paper, as well as problems identified.

Inclusion of Phasor Measurements in the State Estimator of the Serbian TSMO SCADA/EMS System