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Cross Border Sensitivities and Tracing Flow Procedures to assess the Use of Transmission Capacity of the UCTE network

P. Marannino, F. Zanellini L. Ballabio P. Bresesti Dipartimento di Ingegneria Elettrica B.U. Rete T&D Università di Pavia, Pavia, Italy CESI S.p.A, Milano, Italy Bulk Power System Dynamics and Control – VI, August 22-27, 2004, Cortina d’Ampezzo, Italy SUMMARY 1 The remarkable increase of cross border exchanges, determined by the gradual opening of the electricity markets in Europe, requires adequate infrastructures for the development of an Internal Electricity Market. Moreover, the existing interconnection corridors, that have been planned and realized for reliability purposes rather than for power trades, are operating today with reduced transmission margins and the consequent occurrence of congestions across the borders of several UCTE countries. In this sense, the development of suitable tools for the determination of the use of the transmission capacity by the different market players seems to be very useful not only in order to obtain an efficient transmission pricing mechanism, but also to manage in a correct way the congestions arising from the unusual power exchanges. Aiming to this purpose, the paper deals with the calculation of the so called Power Transfer Distribution Factors (PTDF) and with their application to determine the cross border sensitivities with respect to bilateral and multilateral transactions. Using the afore mentioned sensitivity approach, the paper proposes a “path following” procedure to trace the preferential directions used by the power exchanged between sending and receiving busses. The characteristics of this approach are compared with the ones of well known tracing flow algorithms. Both the cross border sensitivities and “path following” procedures have been tested on a detailed model of the UCTE network, putting in evidence the impact of the simulated multilateral transactions on the use of the cross border corridors and of the internal transmission facilities.