Adaptive protocol conversion system for high-voltage direct-current measurement and using method thereof

Abstract

The invention discloses an adaptive protocol conversion system for high-voltage direct-current measurement and a using method thereof, and belongs to the technical field of power communication and automation. The adaptive protocol conversion system comprises a photoelectric conversion module, a protocol conversion unit and a communication interface module. The adaptive protocol conversion system can receive optical digital signals of various IEC60044-8 communication protocols such as standard FT3 and state grid FT3 data frame formats specified by IEC60044-8, and convert the optical digital signals into IEC61850-9-1, IEC61850-9-2LE and state grid IEC61850-9-2 network digital message signals meeting the IEC61850-9 standard in a high-speed, stable and real-time manner for optical digital protection, control, metering, measurement and test equipment. The protocol conversion system has the functions of intelligently identifying the Baud rate, the sampling rate, the link layer length and thenumber of check bytes of an input signal, has high-speed, stable and real-time conversion performance, and is widely applied to testing and verification of intelligent substations, converter stationmeasurement systems and digital equipment.

Description

technical field [0001] The invention relates to the technical field of electric power communication and automation, and more specifically relates to an adaptive protocol conversion system for high-voltage direct current measurement and a method for using the same. Background technique [0002] The DC measurement system of the converter station of the flexible DC, EHV and UHV DC transmission projects consists of a DC electronic current transformer (ECT), a DC electronic voltage transformer (EVT), an optical current transformer (OCT) and an electronic transformer. Combination unit. In order to ensure transmission stability and real-time performance, the communication interface of the high-voltage DC measurement system generally adopts the point-to-point serial communication method of the IEC60044-8 standard, and the commonly used data frame formats of the IEC60044-8 interface standard include IEC60044-8 FT3, State Grid FT3, etc. type. The communication interface of the high-...

AI Technical Summary

Problems solved by technology

The communication interface of the high-voltage DC measurement system adopts the point-to-point serial communication mode of IEC60044-8 standard FT3 format, which ensures the stability and reliability of data transmission, but the point-to-point serial communication mode of IEC60044-8 protocol FT3 format is not conducive to data sharing and Utilization, at present, the development cost of testing and calibration equipment such as electronic transformer calibrator, combined unit tester, control and protection device tester developed for the IEC60044-8 communication protocol is high, but the actual application limitations are very large, and the economic benefits Poor performance, which seriously limits the development and progress of testing and verification technology for flexible DC, EHV, and UHV DC control and protection secondary equipment

[0003] With the development of the secondary equipment of smart substations to the network, at present, various measurement data of smart substations at home and abroad are mainly transmitted in the form of shareable network digital messages, and IEC61850-9 digital messages can be transmitted in the network and through networks such as switches Equipment is shared for protection, control, metering, measurement and other equipment. Therefore, the IEC61850-9 protocol has been widely used in AC smart substations and AC smart substation equipment calibration equipment. Related test calibration equipment and test methods are becoming mature, such as electronic Type transformer calibrator, merging unit tester, network pressure analyzer, optical digital relay protection tester, synchronous clock calibrator, digital electric energy meter calibrator, fault recording device and other test calibration equipment mostly only support IEC61850-9 digital network message input, but does not support the IEC60044-8 communication protocol, so it is impossible to directly apply the relevant testing and verification technologies and methods of the secondary equipment of the AC smart substation to the testing and calibration of the secondary equipment of the flexible DC, HV / UHV DC test

[0004] At present, the conversion of the IEC60044-8 communication protocol to the IEC61850-9-2 format at home and abroad depends entirely on the merging unit (see Figure 4 ), as one of the core equipment of smart substations and converter stations, the merging unit has the characteristics of complex functions, wide influence, and high price. debug detection

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