Substation communication method and system

The invention provides a substation communication method and system. The method comprises the following steps: handshaking with a server to obtain a target encryption suite and a target DTLS protocol; generating a first symmetric key according to the key seed information based on the target encryption suite; sending key seed information to the server based on the target DTLS protocol; constructing transmission layer connection based on the target DTLS protocol, and sending construction information to the server; encrypting the first data by using the first symmetric key to obtain first encrypted data; based on the transmission layer connection, first encrypted data are sent to the server side, second encrypted data from the server side are received, and the transmitted data are data of an IEC103 application layer protocol. According to the application, encryption transmission of application layer protocol data can be realized in the UDP/IP, and the data interaction security of IEC103 protocol communication ba