Method for processing sampling value of digitalization protection test control apparatus

A technology for protection, measurement, control, and processing methods, applied in emergency protection circuit devices, measurement devices, and measurement of electrical variables, etc., can solve problems such as large measurement errors, data collisions, and protection measurement and control devices. Effect

Inactive Publication Date: 2009-01-21
NARI TECH CO LTD
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Problems solved by technology

[0007] At present, the technology of electronic transformers is not yet fully mature, and may occasionally output error codes, and data transmission through Ethernet may cause data collisions, network packet loss, etc.
Therefore, the protection measurement and control device located at the interval layer may lose data packe

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  • Method for processing sampling value of digitalization protection test control apparatus
  • Method for processing sampling value of digitalization protection test control apparatus
  • Method for processing sampling value of digitalization protection test control apparatus

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Embodiment Construction

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

[0027] 1. Functional structure of protection measurement and control device

[0028] IEC60044-8 example electronic transformer interface block diagram is as follows figure 1 As shown, twelve voltage and current transformers in one interval are divided into groups and connected to the secondary device through the merging unit (MU). The protection and measurement and control devices at the bay layer receive the sampling value data input by the merging unit through Ethernet or optical fiber. figure 2 It is a structural block diagram of the interval layer protection measurement and control device based on the sampling value interface introduced by the present invention. The device cancels the traditional AC sampling software and hardware modules, and replaces it with an Ethernet communication interface for transmitting sampled values. After the sampling value is rece...

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Abstract

The present invention relates to a sampling value processing method of integrative device based on a sampling value interface, which is used for protecting and monitoring a digital substation. The method is characterized in that the sampling value interface module of the integrative device is used for real-time judgment on the effectiveness and rationality of sampling values which are transmitted from an incorporating unit; the secondary Lagrange interpolation are calculated for a small quantity of broken or lost sampling values; a window function is used for designing a high-order FIR digital filter which is used for filtering the sampling values; the on-line parameters of the threshold and the filter are regulated in a self-adapting way according to the parameters of conventional data sets transmitted by the sampling values; the protection function is resampled by adopting a secondary Lagrange algorithm of fixed frequency according to the requirements of protecting and monitoring functions; the monitoring function is first processed by iterative computation of frequency; the real-time resampling frequency s regulated according to the signal frequency; the sampling values are resampled by adopting the secondary Lagrange algorithm according to the novel sampling frequency, thus the processing method not only satisfies the requirements of protection and application, but also improves the measurement accuracy.

Description

technical field [0001] The invention belongs to the technical field of electric power automation. It relates to a digital substation protection measurement and control device. More precisely, the invention relates to a method for processing sampling values ​​of a digital substation protection measurement and control integration device based on a sampling value interface. Background technique [0002] In power systems, conventional electromagnetic current, voltage transformers or capacitive voltage transformers have been used for a long time to convert and transmit primary current and voltage signals. In the application of high-voltage and ultra-high-voltage power engineering, due to the increase of system voltage, the insulation structure of the transformer is complicated, the volume increases, and the cost also increases. At the same time, the electromagnetic current transformer also has magnetic saturation and ferromagnetic resonance. , small dynamic range and other short...

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Application Information

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IPC IPC(8): H02H7/22G01R19/00
Inventor 周斌黄国方何朝辉张斌闫承志
Owner NARI TECH CO LTD
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