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Real-time power quality data compression algorithm

A power quality and data compression technology, applied in electrical components, code conversion, etc., can solve the problem of low accuracy of restored data errors, and achieve the effects of good real-time performance, broad engineering application prospects, and simple algorithms

Active Publication Date: 2012-03-28
NARI TECH CO LTD
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Problems solved by technology

The higher the compression ratio of the lossy compression algorithm, the lower the error accuracy of the restored data will be

Method used

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Embodiment Construction

[0017] The comprehensive extreme value method includes the following steps:

[0018] 1. Cut the power quality sampling data to a certain length, set is the number of cycles, and the sampling frequency is , is the number of discrete points sampled, then , the sampling data are recorded as: , then the input data array is: , is a two-dimensional Array of rows, the abscissa is from arrive Arranged in positive order, the ordinate is the sampling data.

[0019] 2. Compare in order of abscissa from small to large The ordinate values ​​of two adjacent elements in ,like or ,Will Save it as the first extreme value array Elements. The sampling data at the two endpoints are the extreme points by default, assuming that there are a total of local extremum points, then the extremum array the length of .

[0020] 3. Array of extreme values Use cubic splines:

[0021] Perform interpolation fitting to obtain the length The undo data of , as the undo ...

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Abstract

The invention provides a real-time power quality data compression algorithm, namely an integrated extremum method which comprises an extremum method and an LZW (Lempel-Ziv-Welch) lossless compression algorithm. The data sampled by a power quality monitoring device for a long time at a high speed in an on-line mode is firstly subjected to real-time loss compression by the extremum method and then subjected to lossless compression and storage, and is uploaded to a power quality data center regularly; and the data is decompressed and reduced to valid data meeting error and accuracy requirements in the power quality data center. The algorithm provided by the invention realizes real-time high-efficiency compression of the power quality sampling data, is simple, and has good timeliness and wide engineering application prospects.

Description

technical field [0001] The invention belongs to the technical field of electric power systems and automation thereof. More precisely, the invention relates to a method for compressing real-time power quality data in electric power systems. Background technique [0002] With the wide application of a large number of sensitive power electronic equipment in the industry and the continuous improvement of users' requirements for power quality, the problem of power quality has attracted more and more people's attention. An important content and strategy of Because the power quality problem covers a very wide spectrum range, the monitoring device must have a high sampling frequency, so the data to be stored will be quite large. The huge amount of data brings great challenges to storage and network transmission, so efficient and real-time compression of power quality monitoring data is required. [0003] Compression ratio, error accuracy and real-time performance have always been ...

Claims

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Application Information

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IPC IPC(8): H03M7/30
Inventor 张长银聂陆燕罗剑波陈汹孙玉军白杰王阳袁康徐军王春梅许世光肖柱陈永华曲晓蕾黄玲丁留宝
Owner NARI TECH CO LTD
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