Trust evaluation model of power terminal based on equipment portrait  

作　　者：Erxia Li Zilong Han Chaoqun Kang Tao Yu Yupeng Huang 

机构地区：[1]Digital Grid Technology Center State Grid Shanghai Energy Interconnection Research Institute,Shanghai 201210,P.R.China [2]State Grid Shanghai Municipal Electric Power Company,Shanghai 200122,P.R.China

出　　处：《Global Energy Interconnection》2023年第6期758-771,共14页全球能源互联网（英文版）

基　　金：supported by the National Key Research and Development Program of China(No.2021YFB2401200)。

摘　　要：As the number of power terminals continues to increase and their usage becomes more widespread,the security of power systems is under great threat.In response to the lack of effective trust evaluation methods for terminals,we propose a trust evaluation model based on equipment portraits for power terminals.First,we propose an exception evaluation method based on the network flow order and evaluate anomalous terminals by monitoring the external characteristics of network traffic.Second,we propose an exception evaluation method based on syntax and semantics.The key fields of each message are extracted,and the frequency of keywords in the message is statistically analyzed to obtain the keyword frequency and time-slot threshold for evaluating the status of the terminal.Thus,by combining the network flow order,syntax,and semantic analysis,an equipment portrait can be constructed to guarantee security of the power network terminals.We then propose a trust evaluation method based on an equipment portrait to calculate the trust values in real time.Finally,the experimental results of terminal anomaly detection show that the proposed model has a higher detection rate and lower false detection rate,as well as a higher real-time performance,which is more suitable for power terminals.

关 键 词：Power terminal Equipment portrait Trust evaluation 

分 类 号：TM73[电气工程—电力系统及自动化] TP393.08[自动化与计算机技术—计算机应用技术]