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
CN103124180AInactive Publication Date: 2013-05-29JIANGSU UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
JIANGSU UNIV
Publication Date
2013-05-29
Estimated Expiration
Not applicable · inactive patent

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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.
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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 ...

Claims

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