Compression method for electric power waveform recording date

A technology of waveform recording and compression method, applied in the direction of digital variable/waveform display, measuring electrical variable, measuring device, etc., can solve the problem of being in the initial stage, and achieve the effect of small calculation amount, low distortion and high compression rate

Inactive Publication Date: 2007-09-19
SHENZHEN SHUANGHE ELECTRIC CO LTD
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Problems solved by technology

However, the research on the application of these methods is still in its infancy, and further improvements are necessary

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  • Compression method for electric power waveform recording date
  • Compression method for electric power waveform recording date
  • Compression method for electric power waveform recording date

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Embodiment Construction

[0041] The power waveform recording device shown in FIG. 1 includes a signal conditioning unit 1 , a signal acquisition unit 2 , a data analysis and calculation unit 3 , a data storage unit 4 and a communication interface unit 5 .

[0042] The signal conditioning unit 1 isolates various input power signals, converts them into standard weak voltage signals, and inputs them to the signal acquisition unit 2;

[0043] The signal acquisition unit 2 converts the input continuously changing voltage signal into a discrete data signal through A / D, and inputs it to the data analysis and calculation unit 3 for calculation;

[0044] The data analysis and calculation unit 3 includes a high-speed floating-point DSP computing CPU, which calculates the discrete data to determine whether there is a fault, extracts the calculated feature quantity, and compresses the waveform data and fault data that need to be recorded using wavelet transform compression technology;

[0045] The data storage un...

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Abstract

The present invention discloses a compressing method of the data recorded by the electric power waveform. The compressing process includes the steps of: the collected data is performed by the integer small wave conversion based on the rising format and then all the data having been converted is coded in the Huffman method; the decompressing process includes the steps of: each pressing data that is read in bit is decoded in Huffman method, and then the data having been decoded is performed by the integer small wave contra-conversion. The present invention has the characteristics of a small amount of computing, a high compressing rate, a small distortion factor, a small occupied computer resources, etc. and the method can be realized in a flushbonding system. The compressibility and the distortion factor can be adjusted according to the demand and the flexibility of the using of the software is added. The present invention can also provide a threshold value to the detail information to realize the lossless compressing and the lossy compression. The electric power system waveform recording device in the present can realize a long-time and continuous recording waveform by combining the electric hardware technology under the situation of high sampling rate and big capability and the waveform can be transmitted far away through the communication interface reliably and quickly.

Description

technical field [0001] The invention relates to a real-time data compression method for a power system waveform data recording device, in particular to a wavelet transform-based compression method for power waveform recording data. Background technique [0002] Power system fault diagnosis, power quality analysis, and research on grid operation status all rely on power waveform record data. However, the current power system waveform recording devices do not use compression technology, and can only record short-term data at the time of failure or reduce the sampling rate to record data for less than 24 hours. Electronic hard disks cannot be used to store long-term continuous power waveform data, and only faults can be recorded. Transient data at the moment of occurrence. [0003] Fourier transform (Fourier transform) is very important in the analysis of power quality problems, but because it does not have time domain analysis capabilities, it has limitations in the analysis ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R13/00
Inventor 古雄文
Owner SHENZHEN SHUANGHE ELECTRIC CO LTD
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