STRUCTURE OF EMERGENCY AUTOMATIC-CONTROL IN ELECTRICAL-POWER SYSTEMS

A four-level structure of emergency automatic control is proposed for a large electrical power system such as the Russian grid. The lowest l evel is composed of local devices, some of which operate in a decentra lized manner, while the remainder participate in the centralized struc ture of the second level. The two upper levels form a hierarchical str ucture. In order to ensure maximum overall accuracy, both static and d ynamic, a method is proposed for flexible interaction of the three upp er levels. Consideration is given to the influence of combining differ ent functions of emergency automatic control in multifunctional device s and changing from a decentralized single-level structure to a centra lized two-level structure on the completeness of information of contro l and the amount of equipment required. Possible difficulties related to speed of response, reliability and viability of emergency automatic control are shown. (C) 1997 Elsevier Science Ltd. All rights reserved .