Distribution network CPS risk assessment method based on variable weight fuzzy analytic hierarchy process

Abstract

The invention provides a CPS risk assessment method of distribution network based on variable weight fuzzy analytic hierarchy process. The method comprises steps: selecting the risk assessment elements of an electric power information network and establishing the hierarchical structure assignment and calculation of the model, constructing a Fuzzy Complementary Matrix, and uniformizing the matrix,the fuzzy consistent judgment matrix being constructed, the relative importance of each element being sorted, the relative weight of each criterion layer element being modified by using the variable weight formula, the node risk quantitative value being calculated, the attack graph being improved, the sensitivity being calculated, the comprehensive risk value being obtained, and the comprehensiverisk value being calculated according to the node risk and sensitivity. The invention can quantify the risks caused by the existing security loopholes to the system, and introduces a variable weight formula on the basis of the traditional fuzzy analytic hierarchy process pair to make the quantization result closer to the actual risk magnitude, thus providing a basis for the managers to better allocate the defense resources.

Description

technical field [0001] The invention relates to an electric power CPS, in particular to a risk assessment method for a distribution network CPS. Background technique [0002] Electric power CPS is electric power information physical fusion system (cyber physical system, CPS). Power CPS integrates the computing system, communication network and the physical environment of the power system through 3C (computation, communication, control) technology to form a multi-dimensional heterogeneous complex system that integrates real-time perception, dynamic control and information services. Compared with the traditional power system, an important advantage of power CPS is that it can obtain comprehensive and detailed information of the power grid in real time with the help of sensor networks and information communication networks. [0003] Due to the high dependence of power CPS on information network, network security plays an important role in the whole power system. Various vulne...

AI Technical Summary

Problems solved by technology

Vulnerabilities exist in all levels and links of the power information network. Once exploited by malicious subjects, it will affect the normal operation of the power information system and its services, and may affect the reliable operation of the power primary system through the power information business. Therefore, it is necessary to conduct a risk assessment of the power information network

Due to the large number of evaluation indicators in the risk assessment process, it is difficult to guarantee the thinking consistency of the traditional Analytic Hierarchy Process (AHP). At the same time, experts use extreme judgments in the qualitative evaluation of the pairwise comparison of risk elements, which does not reflect the elements of the objective world. The prevailing uncertainty and ambiguity between

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