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A Method of Determining Sampling Time According to Data Receiving Time

A technology of sampling time and receiving time, applied in analog/digital conversion, instruments, signal transmission systems, etc., can solve problems such as large sampling time error

Active Publication Date: 2016-08-31
CHINA ELECTRIC POWER RES INST +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The sampling time calculated under this kind of jitter has a large error, and a method for determining the sampling time with high precision is urgently needed

Method used

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  • A Method of Determining Sampling Time According to Data Receiving Time
  • A Method of Determining Sampling Time According to Data Receiving Time
  • A Method of Determining Sampling Time According to Data Receiving Time

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Embodiment

[0143] This method has been used in the measurement scheme of the phase difference of the merging unit at present, and the accuracy can reach 1us. For specific applications, see Figure 5 , Image 6 . Figure 5 The left side of the shows the results calculated by conventional methods, Figure 5 The right side shows the result of measurement and calculation by this method, and the graphs on the left side and the right side are compared, and it can be seen that the method of determining the sampling time according to the data receiving time provided by the present invention has high precision and simple calculation. Image 6 It is the waveform display of the data sent by the merging unit 1, merging unit 2 and merging unit 3.

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Abstract

The invention relates to a method for determining a sampling moment according to a data receiving moment. A device adopted by the method comprises a merging unit, a switch and a protection and measure-control unit which are sequentially connected through optical fibers. Data sampling for the method is performed uniformly, and the method comprises the following steps: (1), sampling data frames from the merging unit, receiving the data frames by the protection and measure-control unit after the data frames pass through the switch; (2),determining a sampling period T continuously in system initialization and operation processes; (3),measuring transmission time delay D in a system initialization process; and (4), determining a sampling moment of raw data continuously in the system initialization and operation processes. According to the method, uncertainty of time delay of data transmission is eliminated; and further, the switch is adopted in a data transmission process, therefore, the complexity for fiber-optic link can be reduced, and the calculation accuracy of the sampling moment is high.

Description

technical field [0001] The invention relates to a method in the field of substation automation, in particular to a method for determining sampling time according to data receiving time. Background technique [0002] In the substation automation system of the three-layer structure (process layer, bay layer, station control layer), it is required that each data acquisition device (that is, the merging unit) can be well calibrated, and it is stipulated that different acquisition devices are in the same Time sampling (to be precise, it should be ensured that the collected amount arrives at the input interface of the acquisition device at the same time. Due to the different delays from the input interface to the A / D conversion circuit of different devices, the actual requirement is Different devices take this delay into account when performing A / D conversion in detail), so that the receiver of the sampled value frame can align the data collected by different merging units accordi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03M1/54
Inventor 李劲松吴晓博许智杨威瞿晓宏陆天健王化鹏刘筱萍刘洋陈心灿张金虎杨文平张海燕孟德伦李睿宜
Owner CHINA ELECTRIC POWER RES INST
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