The paper considers an algorithm of functioning of automatic devices meant for prevention and elimination of asynchronous operation and its instrumentation as well as selection methods for setting parameters. In the Baltic countries, widely recognised are microprocessor devices based on the idea of checking the angle between two simulated voltages. This can be explained by the arrangement of the generating equipment and by the structure of power networks in this region that made it necessary to design special methods and tools for prevention and elimination of asynchronous operation.
This paper presents the final result of a joint EU and Russian project called ICOEUR (Intelligent Coordination of Operation and Emergency Control of EU and Russian Power Grids). The presented results are about the extension and interconnection of large scale power systems from the perspective of monitoring and control. In this paper the authors identify algorithms and monitoring technologies for the identification of full system states and dynamic behavior of system. The algorithms are validated with realistic models from the European and Russian power system. The results lead to a coordination platform which applies Distributed and Dynamic State Estimation in order to manage cross border flows.
The paper analyses the reliability of power supply for a 330/750 kV electrical ring. Consideration is also given to the influence of emergency automatics on the maximum permissible power flows in different electrical connection points of the ring as well as to the application of reliability criterion (N-1) in the case of using the emergency automatics to limit post-accident power flows in these points. The authors discuss the role of operative and technological management in securing the power supply reliability. They also analyze situations with disconnection of major generation units and its influence on the blackout development.
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