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TLS-ESPRIT-based harmonic and inter-harmonic detection method

A harmonic detection and harmonic technology, which is applied in the field of harmonic and inter-harmonic detection based on TLS-ESPRIT, can solve the problems of difficult judgment of the number of signal frequency components and affect the stability of the algorithm, and achieve high stability and high frequency resolution The effect of high rate and high detection accuracy

Inactive Publication Date: 2019-03-29
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +2
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Problems solved by technology

However, in the case of low signal-to-noise ratio, it is difficult for this rotation invariant subspace algorithm to judge the number of signal frequency components, which affects the stability of the algorithm.

Method used

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  • TLS-ESPRIT-based harmonic and inter-harmonic detection method
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  • TLS-ESPRIT-based harmonic and inter-harmonic detection method

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Embodiment 1

[0051] Such as figure 1 As shown, a TLS-ESPRIT-based harmonic interharmonic detection method may include the following steps:

[0052] Step 1. Sampling the voltage signal to be measured, and obtaining the sampled data x 0 , x 1 ,...,x N-1 Arranged into an L×M dimensional sampled data matrix X.

[0053] Step 2: Estimating the frequency component k of the signal by using the Geiger's circle method.

[0054]Step 3: Singular value decomposition is performed on the sampled data matrix X, and the first k columns of the right singular matrix U are taken to obtain the signal subspace U S .

[0055] Step 4, using the total least squares method to obtain the frequency of each component in the sampled signal.

[0056] Step 5, using the least square method to obtain the amplitude and phase angle of each component in the sampled signal.

[0057] Specifically, the TLS-ESPRIT-based harmonic-to-harmonic detection method includes the following implementations:

[0058] (1) The L×M dime...

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Abstract

The invention discloses a TLS-ESPRIT-based harmonic and inter-harmonic detection method. The method comprises the following steps: arranging voltage signal sampling data x0, x1, and the like till xN-1into an LxM-dimension sampling data matrix X; estimating the number of signal frequency components k through the Gerschgorin disk method; carrying out singular value decomposition on the sampling data matrix X so that X is equal to R sigma U<T>, and acquiring the first k rows of a right singular matrix U to obtain a signal subspace Us; obtaining frequencies of components in sampling signals through the total least square method; and obtaining amplitudes and phase angles of the components in the sampling signals through the least square method. The method disclosed by the invention has the advantages of a shorter time window, a higher frequency resolution, higher stability and higher detection precision; and compared with the traditional windowed interpolation algorithm, the algorithm canachieve higher precision during inter-harmonic detection of a dynamic process of a power distribution network, and can more effectively monitor the dynamic process of a system.

Description

technical field [0001] The present invention relates to the technical field of power system power quality, in particular to a TLS-ESPRIT (Total Least Square-Estimation of Signal Parameters via Rotation Invariance Techniques, Total Least Squares-Rotation Invariant Subspace Algorithm)-based harmonic inter-harmonic detection method. Background technique [0002] In recent years, the scale of the distribution network has continued to increase, and a large number of distributed energy sources such as solar energy and wind energy, as well as flexible loads such as electric vehicles, have been connected to the distribution network, so that the distribution network has short distribution lines, few available measurement points, The existing characteristics such as incomplete synchronization and communication conditions have added inter-harmonics, large noise content, and fast dynamic processes. Therefore, the detection of harmonics and inter-harmonics in distribution networks has bec...

Claims

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Application Information

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IPC IPC(8): G01R23/16
CPCG01R23/16
Inventor 刘灏任小伟毕天姝武同心申洪明
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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