This paper addresses innovative nonlinear approaches for dynamic equivalencing of machines for interconnected power systems. In contrast to the existing approaches that consider only fixed equivalencing steps without taking into consideration the machine parameters, these approaches reformulate the classical conditions incorporating real electromechanical model parameters and behaviours of the machines in the dynamic equivalencing. These aspects enable the integration of modern and intelligent techniques, such as the pattern recognition algorithms, Fuzzy concept as machine splitting factor and the system identification by dynamical artificial neural networks. The electromechanical-based approaches generate accurate robust, non-linear dynamic equivalents and thereby enhance significantly their consistency and practical application on network reliability, management and planning.Test of these approaches have been performed and evaluated in large-scale model of the European Interconnected Electric Power System (UCTE/CENTREL) and 16 multi machine system.
This paper describes the innovative concept of a electromechanical approach for recognition the identical behaviour of machines for various power system disturbances. This aspect is used as a basis for generating nonlinear dynamic equivalents which can be applied in transient stability studies incorporating the physical model parameters of the generators. The approach is developed on the basis of the identity conditions, which are solved using standard pattern recognition algorithms. The principal property of this approach consists of the introduction of an electromechanical distance that it significantly improves the accuracy and efficiency of calculating identity-based dynamic equivalents and thereby enhances their consistency, effectiveness and application.Test of these approach have been performed and evaluated in large-scale model of the European Interconnected Electric Power System (western European Union for the Coordination of Transmission of Electricity (UCTE), the central European power system (CENTREL)).
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