Method for processing sampling value of digitalization protection test control apparatus

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...

AI Technical Summary

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 packets or receive bad data. If it is not handled properly, it will cause the protection measurement and control device to malfunction, refuse to operate, or cause large measurement errors.

[0008] At present, the sampling frequency of the electronic transformer is relatively high, and the signal frequency band is relatively wide.

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