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A Survey of Research on Security Risk Assessment of Secondary System

GUO Chuangxin1,LU Haibo1,YU Bin1,MA Taotao2(1.College of Electrical Engineering,Zhejiang University,Hangzhou 310027,Zhejiang Province,China;2.Qingpu Power Supply Company,SMEPC,Qingpu District,Shanghai 201700,China)  
To reduce overall security risk level of secondary system and implement efficient operation of power system in the environment of smart grid,the research on security risk assessment of secondary system is summarized.The sources of security risk in secondary system are expounded in three aspects,i.e.,the secondary devices,information system and human factors,and the ways,by which these risk factors play roles,as well as the affections of these risk factors on primary system are summed up.In the fields of secondary devices,information security and human risks,present state of the research on risk assessment of secondary system home and abroad is summarized and reviewed,and the advantages and disadvantages of existing research results are compared in modeling methods,data sources and risk indices.Such problems and challenges as system complexity,diversity of data sources and lacking in fundamental data of the risk,which the security risk assessment of secondary system has to be faced with under the condition of smart grid,are analyzed,and it is pointed out that the attention of the research on security risk assessment of secondary system in the future should be paid to following four aspects:risk factors,risk data acquisition,risk assessment models and application of risk assessment results.
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