Cascading failure risk assessment method based on network dependency relationship

Abstract

The invention discloses a cascading failure risk assessment method based on a network dependency relationship, and the method comprises the steps: 1, constructing an electric power information physical system, and improving the conditions of the network dependency relationship; 2, constructing a risk transfer function, and forming an initial fault set of information nodes; 3, selecting an initial fault, wherein the fault is transmitted between a power grid and an information network in a cross-space manner due to risk transfer; 4, according to the risk transfer function, selecting an initial fault line and a subsequent fault line of the power grid, and if corresponding fault breaking information is uploaded to a dispatching center, enabling the dispatching center to issue a corresponding control command, if the information is unsuccessfully uploaded, enabling the dispatching center not to perform control, and enabling a protection and safety device to operate according to a system state; and 5, traversing the initial fault set, repeating the steps 3-4 until an end condition is met, recording accident chain data and calculating the risk. According to the method, on the basis of network dependency, the transmission characteristics of a power grid and an information network are considered, so that the cross-space propagation process of faults is researched, and theoretical guidance is provided for prevention and control of cascading faults of an electric power information physical system.

Description

technical field [0001] The invention belongs to the field of power systems, in particular to a method for evaluating the risk of cascading failures based on network dependencies. Background technique [0002] In the power cyber-physical system, the power grid and the information network are interdependent, and faults are transmitted across space between the two networks, resulting in varying degrees of damage to the power grid and information network, resulting in serious economic losses. At present, most scholars only consider the impact of network structure characteristics on power cyber-physical systems when studying network interdependencies, and there are few studies on the characteristics of power grids and information networks. Moreover, in the research on electric power cyber-physical systems, the cascading failures caused by a single network attack or the failure of the information network itself are mainly aimed at, and the two are not considered together. Moreove...

AI Technical Summary

Problems solved by technology

[0002] In the power cyber-physical system, the power grid and information network are interdependent, and faults are transmitted across space between the two networks, resulting in varying degrees of damage to the power grid and information network, resulting in serious economic losses.

At present, most scholars only consider the impact of network structure characteristics on power cyber-physical systems when studying network dependencies, and there are few studies on the characteristics of power grids and information networks.

Moreover, in the research on electric power cyber-physical systems, it mainly focuses on the cascading failures caused by a single network attack or the failure of the information network itself, and does not combine the two into consideration.

Moreover, when evaluating the risk of cascading failures in power cyber-physical systems, existing research only considers the risks of information networks or power grids, and does not regard power cyber-physical systems as a whole.

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