Toward On-line System Splitting Method For Emergency Control With Priority Service Areas

System splitting is an efficient way to prevent widespread blackout.When a large disturbance occurs and the power system integrity cannot be maintained,then the power system is separated into smaller subsystems(in order to maintain the stability of each subsystem).A proper system splitting method is to create stable islands with the minimum possible load-generation imbalance.This requires that the system splitting scheme satisfy certain static and dynamic constraints.Finding proper splitting schemes for on-line application is becoming increasingly difficult due to the combinatorial explosion nature of the problem.This paper considers a new problem formulation of system splitting with priority service areas and proposes an efficient three-stage method for designing on-line system splitting.These three stages are composed of the stage of virtual generator formation,cut-set searching and time-domain stability check.A combination of max-flow/min-cut algorithm and spanning tree algorithm is used in the cut-set searching stage to provide multiple system splitting schemes in short time.A time-domain stability check in the third stage aims to ensure the validity of the system splitting scheme developed by the proposed method.The proposed 3-stage method is evaluated on the IEEE 39 bus test system and 1648 bus test systems to show that the proposed method is computationally efficient and effective.