Research And Implementation With Communication Security Of Power Information Acquisition System Based On Modbus/TCP

Nowadays,with the rapid progress of communication technology,the acquisition manner of power information is gradually being upgraded.The traditional way is gradually withdrawing from the stage of history,and replaced by the acquisition and communicaotion system of power information.The acquisition system of power information can read the distant information of user through wired and wireless way,avoiding the waste of manpower resourcehas,solving the problems of fault by people.However,the power data needs to be transmitted and processed between the collection terminal and the receiving terminal,there are many kinds of communication security problems in the transmission process of power data,likely to cause the error of power information and mass paralysis of communication network.Therefore,this paper mainly implements the design of power information communication program in acquisition system,and analysing of the safety problems of system and the security requirements of different power information,proposing a safety program based on encryption for safety of transmission with power information.Firstly,researching on the common communication protocol of power information.Analysing the characteristics and advantages of various communication mode,selecting the industrial ethernet protocol;putting forward impeccable program of acquisition system with the acquisition terminal and the data concentrator,analysing the power parameter between the acquisition terminal and the data concentrator,designing the format of different power parameter;analysing the specific safety loophole of power infoumation,putting forward the demand for security of different power information and raising the initial safety recommendations of acquisition system of power information.Secondly,for avoiding transmission with exposure of data,preventing the stealing and tamper of data,this paper analyses the encryption algorithm,ayalysing the efficiency and security of different algorithms,selecting appropriate encryption algorithm to solve the problem of transmission with exposure of data,the AES and RSA algorithms are selected as the symmetric encryption of the data security scheme.Combining the advantages of the two algorithms with the security requirements of acquisition system,proposing a security scheme for power information communication based on AES and RSA;designing the new scheme of key management,and a master key was created above the encryption key of data.Finally,based on the program of communication and safety of power information,designing the acquisition terminal and the data concentrator with ARM,designing the main program based on ?C/OS-II,application layer protocol,drive program of ethernet,establish of the connection with TCP,encryption and decryption of Modbus/TCP message.Through the experimental tests of the acquisition system,the results show that the system has admirable measurement accuracy and reliable ability of communication,guaranteeing the secure transmission of power information.