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Ultra-high harmonic measurement method based on compressed sensing MACSMP

A technology of compressed sensing and measurement methods, applied in the field of detection of ultra-high harmonics, which can solve problems such as unknown data sparsity

Inactive Publication Date: 2020-01-21
SHANGHAI MUNICIPAL ELECTRIC POWER CO +1
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  • Application Information

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Problems solved by technology

However, in practical applications, the sparsity of the data is unknown

Method used

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  • Ultra-high harmonic measurement method based on compressed sensing MACSMP
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  • Ultra-high harmonic measurement method based on compressed sensing MACSMP

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Embodiment

[0071] The invention relates to a method for measuring ultra-high harmonics based on compressed sensing MACSMP. The method is based on the compressed sampling matching pursuit (CompressiveSampling MP, CoSaMP) algorithm, combined with the idea of ​​variable step size self-adaptation, and gets rid of the need for signal sparsity Dependence, and the idea of ​​regularization is introduced in the iterative process, thus improving the reconstruction accuracy of the algorithm.

[0072] A method for measuring ultra-high harmonics based on compressed sensing MACSMP, specifically including the following contents:

[0073] Step 1, first discretize the system super harmonic signal.

[0074] Assume that the voltage and current discrete signals of the power system are:

[0075]

[0076] Where: f h Indicates harmonics, and f h = hf 1 , f 1 Indicates the fundamental frequency. h represents the harmonic order, A h and θ h Respectively characterize the amplitude and phase of the hth ...

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Abstract

The invention relates to an ultra-high harmonic measurement method based on compressive sensing MACSMP. The ultra-high harmonic measurement method comprises the steps that (1) a super-harmonic signalin a power system is subjected to discretization; (2) the signal processed in the step (1) is processed by transformed discrete Fourier transform; (3) the signal processed in the step (2) is introduced into an interpolation factor to obtain a latest super-harmonic signal; (4) the latest super-harmonic signal is converted into a compressive sensing model; (5) combined with the converted compressivesensing model and an MACSMP algorithm, a measurement vector is obtained; and (6) the signal is reconstructed by using the obtained measurement vector to achieve final measurement of the super-harmonic signal. Compared with the prior art, the ultra-high harmonic measurement method has the advantages of reduction of the amount of calculation, accurate measurement and the like.

Description

technical field [0001] The invention relates to the field of detection of ultra-high harmonics in power quality, in particular to a method for measuring ultra-high harmonics based on compressed sensing MACSMP. Background technique [0002] With the continuous development of power electronics technology, there are more and more fully-controlled power electronic devices with a switching frequency of several thousand to hundreds of kilohertz, such as photovoltaic inverters, electric vehicle charging piles, energy-saving devices and other equipment. The operation of these devices will generate super harmonics in the frequency range of 2 to 150kHz. A large number of such harmonics are introduced into the distribution network, causing many new problems in power quality. In order to control the harmonic pollution of power electronic devices and other ultra-harmonic sources, the detection of harmonics is particularly important. [0003] In the field of power harmonic analysis, wave...

Claims

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Application Information

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IPC IPC(8): G01R23/16
CPCG01R23/16
Inventor 张鹏潘爱强刘建锋余光正杨秀
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO
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