Correction method for digital quantity input electric energy information sampling data loss

A technology of digital input and electrical energy information, used in the measurement of electrical variables, measuring devices, signal transmission systems, etc.

Active Publication Date: 2013-12-04
JIANGSU LINYANG ENERGY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of how to correct when the sampling point of digital input power information is lost, and propose a correction method for the loss of sampling data of digital input power information

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  • Correction method for digital quantity input electric energy information sampling data loss
  • Correction method for digital quantity input electric energy information sampling data loss
  • Correction method for digital quantity input electric energy information sampling data loss

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Embodiment Construction

[0026] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0027] Such as Figure 1-4 As shown, in the digital substation, the voltage and current data required for electric energy metering are sampled through the electronic transformer, and the current and voltage sampling values ​​are combined and packaged in the merging unit through the synchronous clock. The combined sampling value data package High-speed and reliable optical fiber network is used for transmission, therefore, it can be considered that the sampling values ​​are ordered data at equal intervals.

[0028] The data model of voltage and current value can be expressed by formula (1) and formula (2). For the convenience of analysis, the two data models can be reduced to formula (3) after being discretized. Among them, N is the number of cycle sampling points, and the typical values ​​in the used sampling value transmission protocol IEC61850-9-2LE...

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Abstract

The invention discloses a correction method for digital quantity input electric energy information sampling data loss. The method is an interpolation method based on a sine curve and comprises the steps of: judging the serial number of sampling points in electric energy information sampling data and capturing sampling points with frame loss; recording the latest sampling point value as a sample value used for interpolation; when the number of the sampling points of a cyclic wave is 80, processing the sample value by adopting a median interpolation way once information of a sampling point is lost; when the number of the sampling points of a cyclic wave is 256, processing the sample value by adopting a recursive extrapolation way and calculating a target sampling point value which needs to be supplemented once the information of 8 sampling points is lost. As a fundamental wave of a power grid is a sine curve, the interval of the sampling points is fixed, the number of the sampling points of the cyclic wave is known, interpolation can be carried out by adopting a sine curve fitting way, and high reliability is achieved. The calculation amount and the needed data storage space of the method are small, so that the specific engineering application can be satisfied well.

Description

technical field [0001] The invention relates to the field of electric energy metering data processing in digital substations, in particular to a method for correcting lost data at digital input electric energy metering information sampling points. Background technique [0002] In recent years, digital substations under the IEC61850 standard have developed rapidly, and they use photoelectric sensors to replace traditional electromagnetic transformers, such as figure 1 As shown, the digital substation uses electronic current transformers and electronic voltage transformers to collect current and voltage data. The merging unit is used to synchronously combine the current and voltage sampling values ​​and package them into IEC61850 messages, which are sent to the digital energy meter through the switch. The measurement accuracy is higher, the measurement range is wider, and the error caused by the interference of transmission is reduced. Since the traditional electric energy me...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R35/04G08C23/06
Inventor 尹建丰朱德省施爱博季海涛
Owner JIANGSU LINYANG ENERGY CO LTD
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