Power network security risk assessment method and system

Abstract

The invention discloses a power network security risk assessment method and a system. The power network security risk assessment method comprises the steps of: establishing a power network security risk assessment double-layer planning model; acquiring an approximate optimal solution of the power network security risk assessment double-layer planning model by using a constraint and bound shrinkagemethod; and taking the approximate solution as an initial solution of a hill climbing method, and iteratively acquiring a global optimization risk value of the power network security risk assessmentdouble-layer planning model. According to the power network security risk assessment method, the idea of iterative solution of upper-layer planning and lower-layer planning is adopted to reduce the calculation complexity, the number of iterations is small, the approximate solution of the model can be quickly obtained, and the defect of low calculation efficiency of a traditional method for processing a large-scale power system is overcome. A plurality of local optimal solutions of the double-layer planning model are limited out of the range of a solving search domain by adopting a means of constraining and bound shrinkage, and an effective initial value is provided for an iterative solving process, so that a final iterative result can be close to or equal to a global optimal solution, andthe defect of low solving precision of a traditional iterative solving algorithm is effectively overcome.

Description

technical field [0001] The invention relates to the technical field of power system information physical security, in particular to a power network security risk assessment method and system. Background technique [0002] In recent years, in order to improve the intelligence level of the power system, information technology and communication technology have been widely used in the power network. The high integration of information technology inevitably introduces corresponding network security risks, making power system measurement data vulnerable to tampering attacks. The accuracy of measurement data is crucial to the dispatch security of the power system. Attackers can inject malicious data to destroy the integrity of the collected measurement data, mislead dispatchers to make wrong decisions, and lead to line disconnection, load shedding, Safety accidents such as cascading failures. [0003] Therefore, from the perspective of defense, it is urgent to develop a power net...

AI Technical Summary

Problems solved by technology

Although the calculation method based on KKT can obtain the global optimal solution of the model, the solution process needs to introduce a large number of additional integer variables and constraints, resulting in extremely low calculation efficiency, making it difficult for this method to deal with large-scale power systems

However, other existing heuristic methods cannot guarantee the calculation accuracy. For example, the hill-climbing method is usually easy to fall into the local optimal oscillation. Although the calculation efficiency is high, the final solution obtained may be far from the global optimal solution, resulting in misjudgment of system risk.

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