| As a nation energy center,the cyber security problems of power industry are becoming more and more serious.Significant cyber security accidents occur in the electric control system due to strengthening cyber security gets more urgent needs.Cyber security risk assessment is an important content of the key technology of cyber security. We can know risks and the risk level of the electric control system more roundly through effective assessment.Enhancing the cyber security and preventive measures of the electric power control system has important significance to improve the overall system security.This paper analysis the security situation and process of cyber security research in power control system,summaries the achievements in the research of cyber security ky technologies.According to comparison of the existing risk assessment solutions and quantitative methods,proposes the solutions and quantitative method based on fault tree and D-S evidence theory,introduces the details in the design process.The thermal power plant auxiliary control system as an example of risk assessment gets the complete process of quantification and model construction.At the same time,through the comparison with the comprehensive evaluation results and the expert opinion of subjective evaluation,the security model and the advice of risk treatment dealing with the system is proposed.The quantitative method and evaluation proposed in this paper can describe the path and process of risk communication clearly, The importance sequence of underlying risks using probability interval can be the basis of making risk prevention and control decision.The uncertainty interval constituted by the likelihood function and belief function of D-S evidence theory can solve the problems of data acquisition.The bottom-up propagation process of fault tree makes the interval result range of risk interval decreased,and the evaluation accuracy of data is improved. |
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