Digital standard source based on precise time control

Abstract

The invention discloses a digital standard source based on precise time control. The digital standard source based on precise time control comprises a man-machine interface module, a signal processing and system control module, a digital waveform sequence storage module, a precise time control and protocol conversion module and an output interface module, wherein the man-machine interface module, the signal processing and system control module, the precise time control and protocol conversion module and the output interface module are connected in sequence; the digital waveform sequence storage module is connected with the signal processing and system control module. The digital standard source based on precise time control can simulate output of an on-site merging unit really and output digital messages according with the IEC 61850-9-1 / 2 / 2LE statute format, the number of ASDUs, the number of sampling points, and other communication parameters can be configured flexibly, influence on precision drift caused by ambient temperature or long-time working can be eliminated, the sent messages have time controllability, time control precision is superior to 100 ns, and the disperse degree of the messages is superior to 500 ns.

Description

technical field [0001] The invention relates to a digital standard source based on precise time control, which can be used for calibrating digital electric energy meters. Background technique [0002] Digital watt-hour meters in intelligent substations usually use optical fibers to receive digital signals of voltage and current sent by electronic transformers and merging units. Therefore, the errors of digital watt-hour meters are mainly caused by algorithm errors, standard bit error rates of communication protocols, and data transmission. caused by time delay, etc. [0003] In the national standard GB / T17215.303 "Special Requirements for Digital Energy Meters of Electrical Measuring Equipment", a method for error calibration of digital energy meters using standard digital power sources is provided. However, in the existing digital power sources, because most of them adopt the DSP+ARM architecture, the timing of the frame sequence of the output IEC61850-9-1 and IEC61850-9-2...

AI Technical Summary

Problems solved by technology

However, in the existing digital power sources, because most of them adopt the DSP+ARM architecture, the timing of the frame sequence of the output IEC61850-9-1 and IEC61850-9-2 digital messages cannot be accurately controlled and cannot be simulated. An ideal standard digital power source does not meet the discrete value requirements of the merging unit, nor can it truly simulate the on-site electronic mutual inductance of the smart substation and the output of the merging unit

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