IMPROVED SECONDARY AND NEW TERTIARY VOLTAGE CONTROL

In this paper the basic role of a secondary (regional level) voltage c ontrol in a multi-regional electric power system is reviewed. Specific ally, certain limitations of presently implemented control schemes are described. Next an Improved Secondary Voltage Control (ISVC) scheme i s proposed. In the second part of the paper possible enhancements of a multi-regional system operation by means of scheduled, Tertiary Volta ge Control (TVC) interactions are proposed. It is shown that the prime role of a TVC is in managing limits on voltage control devices, such as generators. The theoretical developments are illustrated on two reg ions of the French electric power network.