Phase- and time mark measurement-based electronic transformer absolute delay detection method

Abstract

The invention discloses a phase- and time mark measurement-based merging unit (MU) absolute delay detection method. The method comprises the following steps: completing the transformation from electric quantity on the primary side to that on the secondary side through a standard voltage transformer and a standard current transformer, and converting a signal into an analog-digital converted small voltage signal through a high precision converter; triggering and controlling a time sequence through a high precision clock tick, performing high precision acquisition of the small voltage signal, and extracting a fundamental wave signal phase phi 1 which serves as the time when the power frequency analog quantity on the primary side of the MU appears; receiving the digital quantity output of the MU in real time, marking an upper time mark by using the same clock tick, and eliminating shake on the time mark; starting interpolation at the equal sampling rate by using the same trigger signal to obtain new sample data, extracting a fundamental wave signal phase phi 2 which serves as the time when the output port of the MU sends a digital sampling value corresponding to the analog quantity; and obtaining time difference corresponding to the phase difference, and combining the current actual frequency value to convert the phase difference to time, namely the absolute delay of the MU.

Description

technical field [0001] The invention relates to an absolute delay detection method of an electronic transformer based on phase and time scale measurement, and belongs to the field of hardware platform development of calibration equipment in smart grids. Background technique [0002] At this stage, the development of my country's smart grid has entered the stage of large-scale comprehensive construction. The safe and stable operation of the power grid and economic construction are closely related to the lives of residents. This is still the fundamental requirement throughout the process of intelligentizing the power grid. With the widespread application of electronic transformers in smart grids, the technical indicators and parameter requirements for electronic transformers are becoming more and more comprehensive and in-depth, and many of them have been clarified from the industry norms and standards. [0003] The absolute delay time of the electronic transformer refers to t...

AI Technical Summary

Problems solved by technology

[0005] In the current application of electronic transformers, due to the lack of effective testing schemes and testing technologies, there is a lack of targeted testing of the absolute delay time of electronic transformers in all aspects of production, joint debugging and operation, which brings The work efficiency is low, and there are great safety hazards

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