Interarea Oscillations and Tie-line Transients in the Hellenic Interconnected System

This paper presents a model of the Southeastern part of the UCTE Interconnection that is used to assess interarea oscillation modes and the transient loading, after a severe disturbance, of the tie-lines connecting the Hellenic System to its Northern neighbours. Eigenvalue analysis and FFT are used to identify the interarea modes involving the UCTE Interconnection, as well as the Hellenic System. Damping is found adequate but depending upon external stabilizers and governor modelling. It was shown by simulation that a severe disturbance may cause load shedding to protect the most critical tie-line.