Lossless compressing method and lossless uncompressing method of fault wave record data

A technology of lossless data and fault recording, which is applied to electrical components, code conversion, etc.

Inactive Publication Date: 2013-12-18
XUJI GRP +2
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Problems solved by technology

In short, there are many compression schemes to compress fault recording data, each has it

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  • Lossless compressing method and lossless uncompressing method of fault wave record data
  • Lossless compressing method and lossless uncompressing method of fault wave record data
  • Lossless compressing method and lossless uncompressing method of fault wave record data

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[0030] 1. Lossless compression method for fault recording data

[0031] Such as figure 1 As shown, the lossless compression method of fault recording data first analyzes the comtrade configuration file of fault recording to obtain information such as sampling rate, number of analog channels, number of state quantity channels, frequency, etc. According to these information, the dat file can be divided into three Part: data basic information, analog channel data, and state quantity channel data; according to the different characteristics of these three parts of data, they are processed in different ways. We call the above processing data preprocessing; these preprocessed data are all It is stored in the pre-processing compressed file, and finally the pre-processing data file is subjected to dictionary compression to further improve the compression ratio. The decompression of data is to dequantize the data according to the reverse process, and reconstruct the original signal. Th...

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Abstract

The invention relates to a lossless compressing method and lossless uncompressing method of fault wave record data. The compressing method comprises the steps that firstly a comtrade configuration file is analyzed, and a dat data file is obtained; the dat data file is divided into data basic information, analog channel data and state quantity channel data according to content; the data basic information is stored in a data basic information area; sampling point data of a current period of each analog channel and synchronous sampling point data of the last period of the analog channel are subtracted in sequence, and the results are stored into an analog data pre-processing compression area; the state quantity channel data are compressed in a run coding mode, and the compressed data are stored into a state data pre-processing compression area; one-time dictionary compression is conducted on a pre-processed compression file, and a final compression file is formed. According to the respective data characteristics of the three parts, data pre-processing compression is conducted in different modes, secondary compression is conducted on the pre-processed data, and the compression is efficient and lossless. The uncompressing method is the reverse process of the data compression and the process of data reconstitution.

Description

technical field [0001] The invention belongs to the technical field of data compression of fault recording files in electric power systems, and relates to a lossless compression and decompression method for fault recording data. Background technique [0002] In today's power system, with the development of microelectronic technology, the monitoring level of the fault process is getting higher and higher, and a large number of fault recording devices continue to emerge. They can automatically and accurately record the changes of various electrical quantities (main digital quantities, such as switch state changes, analog quantities, mainly voltage and current values) in the process before and after the power system fault, through the analysis of these electrical quantities Analysis and comparison have the functions of analyzing and handling accidents, judging whether the protection is operating correctly, and improving the safe operation level of the power system. At the same...

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Application Information

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IPC IPC(8): H03M7/30
Inventor 宋彦锋陈献庆杨芳徐云松李杰沈沉任红旭汤洋王西邓李英明顾峰马仪成
Owner XUJI GRP
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