Data reconfiguration and decompression method of power system based on projection pursuit

A technology for power system and data reconstruction, applied in electrical components, code conversion, etc., can solve problems such as large original data storage space and consumption

Inactive Publication Date: 2013-05-29
JIANGSU UNIV
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Problems solved by technology

With the construction of intelligent grid monitoring mode, grid data collection continues continuously. Even if most of the sampled data volume is discarded through high-performance compression methods, a large amount of original data storage space will still be consumed.

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  • Data reconfiguration and decompression method of power system based on projection pursuit
  • Data reconfiguration and decompression method of power system based on projection pursuit
  • Data reconfiguration and decompression method of power system based on projection pursuit

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Embodiment Construction

[0029] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0030] The steps of the power system data reconstruction and decompression method based on projection tracking in the present invention are as follows:

[0031] (1) Set the relevant parameters such as the compressed sensing matrix required for compressed sensing sampling, and apply the compressed sensing data sampling to complete the power quality data acquisition and compression process.

[0032] (2) Using the proposed power quality data projection tracking reconstruction decompression method, the relationship between the compressed sampling value sequence and the perception matrix is ​​established, and the projection tracking matching method is used to select the atoms that best match the compressed sampling value sequence from the perception matrix to construct a sparse approximation , to obtain the signal residual representation, after several iterative o...

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Abstract

The invention discloses a data reconfiguration and decompression method of a power system based on projection pursuit. A signal can be sampled at frequency far below Nyquist frequency on the basis of a compressive sensing theory. The method comprises the following steps of: firstly, constructing an over-complete atom dictionary to ensure that atoms in the atom dictionary are redundant; secondly, searching an optimally-matched atom, updating signal residuals, and re-acquiring sparse vector elements; and finally, acquiring a sparse vector. According to the method, in an iteration process at each time, the atom which is optimally matched with the signal is selected from a sensing matrix to construct sparse approximation, signal residual representation is obtained, and the signal is linearly represented by a certain number of atoms by certain iteration frequency. According to the conventional data compression method, sampling and compression are required to be performed in sequence. According to the data reconfiguration and decompression method, the sampling and the compression are performed concurrently, and an original electric energy quality signal can be well restored by low sampling frequency.

Description

technical field [0001] The invention relates to a power system data reconstruction and decompression method, in particular to a power quality data projection tracking reconstruction and decompression method based on the compressed sensing theory. Background technique [0002] The power sector needs to monitor power system voltage, current and other data in real time in order to analyze fluctuations, flicker, harmonic conditions, impedance frequency characteristics and power quality, which will result in a huge amount of data, whether it is stored locally or transmitted to the power sector. will bring a heavy burden. Therefore, the storage of a large amount of data in the power system is an urgent problem to be solved, and the effective method is to compress the data. Regarding power system data compression, in recent years, researchers often only pay attention to the compression of fault data. In fact, with the improvement of power system automation, the goal of smart grid ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M7/30
Inventor 沈跃刘慧刘国海陈兆岭张浩赵文祥白雪蒋彦
Owner JIANGSU UNIV
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