Substation adaptive network based on difference detection and secure clock synchronization method thereof

Abstract

The invention belongs to the technical field of intelligent substation network security, and particularly relates to a transformer substation adaptive network based on difference detection and a secure clock synchronization method thereof. The network comprises optical network units ONU, a synchronous optical line terminal OLT and an EPON protocol processor; two interfaces of each ONU have the same state all the time, and redundancy configuration of master and slave links is adopted; and the EPON protocol processor communicates with the ONU through a multipoint control protocol. The method comprises the following steps: the EPON protocol processor transfers a timestamp to each ONU; the OLT compares whether two interfaces of the ONU receive messages within a specified time difference and whether the synchronous timestamps carried in the messages are consistent, if not, a security threat exists, and the time check is not adjusted; and if so, the OLT detects whether a round trip time RTT difference exceeds a specified threshold, if so, the security threat exists, and the time check is not adjusted; and if the RTT difference does not exceed the threshold, ONU registration is completed, and normal communication is started.

Description

technical field [0001] The invention belongs to the technical field of intelligent substation network security, in particular to a substation self-adaptive network based on difference detection and a clock synchronization security method thereof. Background technique [0002] The physical structure of the intelligent substation adaptive network is the same as that of EPON (Ethernet Passive Optical Network, Ethernet Passive Optical Network), and the idea of ​​label switching is adopted in the core switch to realize the integration of GOOSE, SV and MMS. In order to improve the reliability of the network, a double-star (A, B) network architecture is established, and the A and B networks constitute the main and backup mode. The reliability of the adaptive network of the new smart substation plays an important role in the stable operation of the whole smart substation, especially the time synchronization system is very important. The IEEE1588 standard defines the precise clock s...

AI Technical Summary

Problems solved by technology

However, if the time synchronization fails, or is destroyed, especially after the equipment in the system is implanted with a destructive program, once the destructive program is executed and starts to destroy the clock synchronization, it will cause the cross-bay protection (transformer, bus) to be out of sync due to sampling out of operation, or even misoperation, resulting in substation failure

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