On the conversion of an existing practical AC transmission system to DC

Abstract EN

The technical factors that should be considered in the conversion of an existing practical AC transmission system to DC in order to increase its power transfer capability (PTC) are discussed.

Economical considerations in this AC/DC transmission conversion are also discussed.

Possible conversion schemes of single-circuit and double-circuit AC lines are identified.

An analytical methodology based on assumed design constraints is developed and new indices are proposed to evaluate the effectiveness of the AC/DC transmission conversion.

The main objectives of the proposed methodology are to determine the design levels of current, voltage and uprated power for the converted DC system and to provide main ratings and basic characteristics of the rectifier and the inverter stations.

Provided in this paper are results of the application of the proposed methodology and effectiveness indices to the existing 500 k V High Dam-Cairo AC double-circuit transmission line in Egypt as an alternative to increase its PTC.