Optical fiber-digital synchronous interface system based on FPGA

Abstract

The invention discloses an optical fiber-digital synchronous interface system based on FPGA. The system comprises a microprocessor, an FPGA controller and an optical transceiver module used for converting photoelectric signals, the FPGA controller comprises an HDLC frame protocol transceiver and a physical layer optical fiber communication line using CMI codes, the HDLC frame protocol transceiver is composed of a sending control module and a receiving control module, the microprocessor is in communication connection with the HDLC in the FPGA controller in a bus mode, and the HDLC communicates with the CMI and is connected with the optical transceiver module. The microprocessor of the system reads data in the FPGA through a read-write bus, an HDLC protocol and a CMI encoding and decoding function are realized by the FPGA, the traditional way of implementing the HDLC protocol by using SCC hardware can be omitted, the data in an opposite side relay protection device in optical fiber transmission are obtained, so optical fiber longitudinal differential protection can be realized, and the system has the advantages of low hardware cost, reliable communication, good flexibility and convenient maintenance.

Description

technical field [0001] The invention belongs to the field of electric power system relay protection, and in particular relates to an FPGA-based optical fiber digital synchronous interface system. Background technique [0002] With the increasing development of optical fiber digital communication technology and its gradual application in power systems, optical fiber longitudinal differential protection has gradually been widely used in transmission lines due to its simple principle and reliable performance. The popularization of optical fiber in power systems, As a result, optical fiber longitudinal differential protection is used more and more. Optical fiber differential protection requires that the data transmitted by optical fiber must be accurate, efficient, and real-time. Therefore, the design of optical fiber digital synchronous interface is very critical. The traditional protection synchronous interface circuit design uses many related chip stacking circuits, such as S...

AI Technical Summary

Problems solved by technology

The traditional protection synchronous interface circuit design uses many related chip stacking circuits, such as SCC+separation components, SCC+CPLD+PLL or SCC+FPGA, which not only reduces the reliability of communication, but also makes it difficult to flexibly meet the requirements of the protection system

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