Abstract
In the European power system UCPTE in parallel operation with the Central-European power systems, called CENTREL, slowly damped inter-area oscillations have been observed. The swings occurred especially when long distance power transactions were carried out. The paper presents results of a small signal stability analysis, focused on power transits in the European power system. In a detailed model the critical swing modes, their mode shapes and the participation factors were investigated. In the East-West-direction two swing modes with wide area effect are significant. To make clear the causes for insufficient damped interarea swings a sensibility analysis relating to power transits, network voltage level and generator voltage controller gains has been carried out.
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