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An on-site verification method to solve the delay problem between different merging units in smart substations

A smart substation and on-site verification technology, applied in the field of smart substations, can solve problems such as unstable time performance and data information, and achieve great originality and reference value, improve stability and reliability, and strong practicability Effect

Active Publication Date: 2019-06-28
TIANJIN ELECTRIC POWER TRANSMISSION & TRANSFORMATION ENG CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is introduced that the biggest difference between smart substations and traditional substations lies in the transformation of the communication network system. The introduction of the merging unit solves the problem of data sharing, but it brings the instability of data information at the transmission level, especially the instability of time performance. Stability, including time accuracy and communication delay characteristics

Method used

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  • An on-site verification method to solve the delay problem between different merging units in smart substations
  • An on-site verification method to solve the delay problem between different merging units in smart substations
  • An on-site verification method to solve the delay problem between different merging units in smart substations

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Embodiment 1: see attached figure 1 Shown is the on-site verification with a single set of protective devices:

[0048] ⑴Analysis of the size of time-difference flow with inconsistent delay and its impact on protection

[0049] Through the analysis of each link with delay in the merging unit, for the resampling link, the merging unit performs resampling according to the receiving time of the synchronization pulse and the corrected digital sampling value, and then completes the sampling synchronization between the collectors. Generally, it will not occur Delay deviation; for transmission delay, the length of the optical fiber will not be too long within the normal range of the substation, so it cannot cause a large delay, which can basically be ignored. It is relatively important that the sending delay of the merging unit determines whether there is an error in the sending time of the sampled value message.

[0050] At present, the sampling system of the smart substati...

Embodiment 2

[0073] Embodiment 2: see attached figure 2 Shown is the verification method of dual configuration protection, the following methods can be adopted:

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Abstract

The invention relates to a site calibration method for solving delay problem among different combination units of an intelligent substrate. The site calibration method comprises the steps of (1) analyzing a differential current size when delay is not consistent and analyzing influence of protection; (2) selecting a calibration method according to a delay analysis result, wherein the calibration method comprises a calibration method for that the delay difference of different combination units is a non-integer multiple of cycle wave and a calibration method for that the delay difference of different combination units is an integer multiple of cycle wave. By the method, the inconsistent conditions of the combination units at each side are classified and separately discussed, a new calibration method for inconsistent delay of the combination units at each side and a calibration method of a dual-configuration protection device, which are corresponding to different conditions, are proposed on the basis, and the method has the characteristics of high practicability, simplicity and the like, and is easy to operate.

Description

technical field [0001] The invention belongs to the field of smart substations, and is aimed at the application of merging units in smart substations and the related problems caused by the inconsistency of merging single-cloud delays during operation, especially an on-site calibrator that solves the delay problem between different merging units in smart substations. test method. Background technique [0002] At present, smart substations are still in their infancy in my country. Although the State Grid Corporation of China has proposed the commissioning specifications for related smart substations, the on-site verification method for inconsistent delays of combined single-cloud devices in smart substations is still basically in a blank stage. The smart substation is becoming more and more mature. The merging unit is a new thing and part of the smart substation. In the smart substation, the intelligent device that realizes data acquisition and conversion is the merging unit. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H1/00
CPCH02H1/0069
Inventor 王进虎曹正刘越
Owner TIANJIN ELECTRIC POWER TRANSMISSION & TRANSFORMATION ENG CORP
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