Implementation of enhanced network sensitivities in rule based systems for line flow security analysis—case studies for a practical power system

This paper presents the use of network sensitivity factors for alleviating line overflow. The network sensitivity factors are enhanced to consider multiple circuits between two adjacent buses. Associated with the sensitivities, a rule based system is presented for correcting the line overload after a contingency occurs. The accuracy of the sensitivities, selection of the swing bus and impact of multigenerators at a common bus are discussed. The IEEE 30-bus system and a practical 265-bus system in Taiwan are used as samples to show the applicability of the rule based system proposed in this paper.