The paper describes the algorithm for distributed state estimation (SE) and is focused on its testing and validation. For this purpose, different events in the modeled power system of the 330-750 kV electrical ring Latvia - Lithuania - Belarus - Smolensk - Moscow - St. Petersburg - Estonia - Latvia were considered. The methods for testing the Inter-TSO SE prototype and dynamic network monitoring & modeling are based on comparison of the available SCADA data about real events with those of SE calculation. In total, four operational states were studied, including initial, accident and two post-accident operational states
The paper focuses on the application of synchrophasor measurements that present unprecedented benefits compared to SCADA systems in order to facilitate the successful transformation of the Nordic-Baltic-and-European electric power system to operate with large amounts of renewable energy sources and improve situational awareness of the power system. The article describes new functionalities of visualisation tools to estimate a grid inertia level in real time with monitoring results between Nordic and Baltic power systems.
Vedran Kirincic, Srdjan Skok and Dubravko Frankovic
 TERZIJA, V.-VALVERDE, G.-CAI, D.-REGULSKI, P.-MADANI, V.-FITCH, J.-SKOK, S.-BEGOVIC, M.-PHADKE, A. : WideAreaMonitoring. Protection and Con- trol of Future Electric Power Networks, Proceedings of IEEE 99 (2011), 80-93.
 CHAKRABARTI, S.-KYRIAKIDES, E.-TIANSHU, B.-CAI, D.-TERZIJA, V. : Measurements Get Togetherjour IEEE Power and Energy Magazine.
 ABUR, A.-GOMEZ-EXPOSITO, A. : Power System State Estimation: Theory and Implementation, Marcel Dekker, New York, 2004.