Electromechanical distance and identity recognition in dynamic equivalencing

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)).