Critical Vertex Identification and Suppression Strategies of Excess Carrying Failure

Suppressing large blackouts caused by the failures of critical components in complex power systems is a systematic project that needs to be comprehensively carried out from multiple aspects, such as planning, construction, and operation control. This article proposes the concept of electrical carrying quantity based on the electrical betweenness to clarify the characteristics of excess carrying failure analysis from the sight of the topology of power networks. Then, the excess carrying propagation model is constructed, which fully considers the basic topological properties and the configuration of generators and loads of complex power networks. Accordingly, the critical vertices that make network redundancy less effective in suppressing failure propagation are identified, which are defined as stubborn vertices. Afterward, an effective edge-cutting algorithm with low algorithm complexity is proposed based on the nature of stubborn vertices as the failure propagation suppression strategy. Finally, the method has been demonstrated on the IEEE 118-bus system. The results show that network redundancy combined with edge-cutting control operation can completely suppress the propagation of excess carrying failures in complex power systems.