IEEE1588 Time Synchronization System for Intelligent Distribution Network Based on Industrial Ethernet Tangent Access Ring

Abstract

The invention relates to a power distribution network timing synchronization system, in particular to an intelligent power distribution network IEEE1588 timing synchronization system on the basis of industrial Ethernet tangency access rings. The intelligent power distribution network IEEE1588 timing synchronization system comprises a backbone layer and access layers; a backbone layer gateway exchanger is connected with a superior network transmission accurate clock device; the backbone layer gateway exchanger is connected with backbone layer exchangers by kilomega optical fiber interfaces to form a ring-shaped structure; each access layer comprises an access layer gateway exchanger connected with the backbone layer exchanger, and a plurality of access layer exchangers; each access layer gateway exchanger is connected with the corresponding access layer exchangers to form a ring-shaped structure; the backbone layer gateway exchanger and the access layer gateway exchangers are set into boundary clocks; the backbone layer exchangers and the access layer exchangers are set into transparent clocks; and power distribution terminal devices are set into common clocks. The intelligent power distribution network IEEE1588 timing synchronization system adopts a simple technology, has high time accuracy, has low dependence on a GPS (Global Positioning System), is cost-saving, has a good expansion degree, has a wide region coverage range and can meet the requirement on time synchronization of an intelligent power distribution network.

Description

technical field [0001] The invention relates to a time synchronization system for a distribution network, in particular to an IEEE1588 time synchronization system for an intelligent distribution network based on an industrial Ethernet tangent access ring. Background technique [0002] At present, the time synchronization accuracy of each backbone node of the transmission network has reached a high standard, and the time synchronization accuracy of the medium-voltage nodes covered by distribution network automation is still relatively low. In the construction of smart distribution network, the wide-area measurement and control system of smart distribution network with synchrophasor acquisition function is the key supporting technology of smart distribution network. Technologies such as network wide-area protection and event management, and smart distribution network seamless self-healing must make the timing accuracy of the distribution network reach the microsecond level, so...

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Problems solved by technology

Among them, GPS synchronization has high precision, but it is expensive and not suitable for application in a large number of nodes in the distribution network, and its stability and security are not very reliable; second pulse and IRIG-B code synchronization can also achieve high precision, but additional control is required. Time-dedicated lines cannot be used in distributed systems with relatively large span distances such as distribution networks; SNTP network message synchronization and time synchronization accuracy can only reach ms level

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