Intelligent power distribution network time synchronization system and method based on PTN+EPON communication system

Abstract

The invention relates to a power distribution network time synchronization system and method, and particularly relates to an intelligent power distribution network time synchronization system and method based on a PTN+EPON communication system. The intelligent power distribution network time synchronization system comprises an accurate clock source device. A primary clock port of the accurate clock source device is connected with a secondary clock port of a local end PTN device via an IEC61588 protocol. The primary clock port of the local end PTN device is cascaded with PTN devices in multiple transformer stations so that an annular structure is formed. The primary clock port of each PTN device in each transformer station is connected with a router which is connected with the secondary clock port of an OLT device via a switch. The OLT device is connected with an ONU device via an optical fiber. The primary clock port of the ONU device is connected with a power distribution terminal. According to the intelligent power distribution network time synchronization system, only a GPS is used as a clock source. An IEC61588 technology is applied, accurate time is transmitted step by step via a communication system so that time synchronization of the whole intelligent power distribution network is realized. Time accuracy is superior to 1 microsecond theoretically so that dependency on the GPS is low, and a requirement of the intelligent power distribution network towards time synchronization can be met. Therefore, the intelligent power distribution network time synchronization system is simple in structure and high in practicality.

Description

technical field [0001] The invention relates to a distribution network time synchronization system and method, in particular to a smart distribution network time synchronization system and method based on a PTN+EPON communication system. Background technique [0002] With the rapid development of smart distribution network, key supporting technologies of smart distribution network such as synchronous measurement and longitudinal protection based on communication network have put forward high requirements for time synchronization system. Therefore, time synchronization technology is very important in smart distribution network status is also increasing. [0003] The most widely used existing power system synchronization technology is the Global Positioning System (Global Positioning System, GPS). The statistical error of GPS output is 1μs, which can meet the clock synchronization requirements of power system automation, and is widely used in substation automation and dispatc...

AI Technical Summary

Problems solved by technology

[0006] The existing smart distribution network time synchronization system is highly dependent on GPS, which is very unfavorable for security, and the smart distribution network has the characteristics of many and scattered outlets, a wide distribution range, and a complex environment. If each distribution terminal is installed Installing a GPS device presents great challenges in terms of economy and feasibility

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