Interharmonic detection method based on triangular-rectangular hybrid convolution window and accelerated pso algorithm

A harmonic detection and convolution technology, applied in spectrum analysis/Fourier analysis, etc., can solve the problem that the decomposition process cannot be perfect

Active Publication Date: 2020-09-22
CHINA THREE GORGES UNIV
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Problems solved by technology

This leads to the fact that the decomposition process in the frequency domain is not always perfect
Therefore, in solving the main lobe interference problem caused by inter-harmonics, the existing algorithm still has a lot of room for improvement

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  • Interharmonic detection method based on triangular-rectangular hybrid convolution window and accelerated pso algorithm
  • Interharmonic detection method based on triangular-rectangular hybrid convolution window and accelerated pso algorithm
  • Interharmonic detection method based on triangular-rectangular hybrid convolution window and accelerated pso algorithm

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Embodiment Construction

[0061] An interharmonic detection method based on a triangular-rectangular hybrid convolution window and an accelerated PSO algorithm, comprising the following steps:

[0062] Step 1: Acquire a discrete signal containing interharmonics.

[0063] The present invention aims to detect inter-harmonics, especially for inter-harmonics with main lobe interference, so the discrete signal is set as formula (1).

[0064]

[0065] in:

[0066] Each sampling point n=0, 1, 2, . . . , N-1, where N is the total length of the signal.

[0067] T s is the time interval between two adjacent sampling points, if the sampling frequency is F s , then T s =1 / F s .

[0068] Step 2: Construct a hybrid convolution window and fit the main lobe.

[0069] Here, take the 5th-order triangular & 11th-order rectangular mixed convolution window as an example, which is convoluted by 4 fourth-order windows:

[0070] w(n)=(w TRRR *w TRRR )*(w TRRR *w TRTR ) (2)

[0071] Among them, * is the convolu...

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Abstract

The invention relates to an inter-harmonic detection method based on a triangular-rectangular hybrid convolution window and an accelerated PSO algorithm. The method includes the following steps that:grid current / voltage signals are converted into secondary side discrete signals through a power transformer; a triangular-rectangular hybrid convolution window with the same length as the length of the signals is constructed, and is multiplied with the signals; the windowed signals are subjected to discrete Fourier transformation, and an appropriate spectral line construction interpolation formulais found in a frequency domain; and the parameters of all sinusoids in a local region are pre-calculated according to a conventional interpolation algorithm; and pre-calculation results are sorted into a matrix, and the matrix, adopted as initial particles, is substituted into the accelerated PSO algorithm. The particles are optimized by iteration, so that harmonic parameters with higher precision can be obtained. With the method adopted, the decomposition of spectra interfered by main lobes can be avoided; the pre-calculated solutions are optimized through an evolution type algorithm. Therefore, the method can stably improve detection accuracy and has high universality.

Description

technical field [0001] The invention belongs to the technical field of harmonic signal detection in power systems, in particular to an interharmonic detection method based on a triangular-rectangular hybrid convolution window and an accelerated PSO algorithm. Background technique [0002] Harmonic detection is one of the important tasks of power quality detection. With the introduction of a large number of nonlinear components into the power grid, the control of inter-harmonics is becoming more and more important. Compared with conventional harmonic detection, interharmonics with irregular frequencies are likely to cause main lobe interference in the frequency domain. Since the traditional interpolation DFT algorithm calculates the harmonic parameters through the spectral lines in the frequency domain, the occurrence of main lobe interference will seriously reduce its detection accuracy. On the problem of interharmonic governance, wavelet transform and similar atomic algor...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R23/16
CPCG01R23/16
Inventor 徐艳春杜于飞李振兴李振华
Owner CHINA THREE GORGES UNIV
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