AN EFFICIENT APPROACH TO THE EVALUATION OF MIDTERM DYNAMIC PROCESSES IN POWER-SYSTEMS

This paper presents some improvements in the methodology for analysing mid-term dynamic processes in power systems. These improvements are: an efficient application of the hierarchical clustering algorithm to a daptive identification of coherent generator groups and a significant reduction of the mathematical model, on the basis of monitoring the st ate of only one generator in one of the established coherent groups. T his enables a flexible, simple and fast transformation from the full t o the reduced model and vice versa, a significant acceleration of the simulation while keeping the desired accuracy and the automatic use in continual dynamic analysis. Verification of the above mentioned contr ibutions was performed on examples of the dynamic analysis of New Engl and and Yugoslav power systems.