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A method for analyzing harmonics and interharmonics of power grid based on sst transform

A harmonic analysis and harmonic technology, applied in the field of power grid harmonic and inter-harmonic analysis based on SST transformation, can solve the problem of not being able to separate harmonics and inter-harmonics well, and achieve high discrimination and accurate separation The effect of the result

Active Publication Date: 2017-06-20
XIAN UNIV OF TECH
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Problems solved by technology

[0006] The purpose of the present invention is to provide a power grid harmonic and inter-harmonic analysis method based on SST transformation, which solves the problem in the prior art that the harmonics and inter-harmonics with closer frequencies cannot be well separated

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  • A method for analyzing harmonics and interharmonics of power grid based on sst transform
  • A method for analyzing harmonics and interharmonics of power grid based on sst transform
  • A method for analyzing harmonics and interharmonics of power grid based on sst transform

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Embodiment Construction

[0035] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0036] In the present invention, a method for analyzing harmonics and interharmonics of a power grid based on SST transformation, the flow chart is as follows figure 1 As shown, the specific steps are as follows:

[0037] Step 1. Use transformers or Hall sensors or other sampling equipment to sample and discretize the signal of the power system to be detected, and obtain the discrete signal to be detected and send it to the central processing unit CPU (which can be DSP or FPGA or other processing chips);

[0038] Step 2, in the central processing unit, carry out SST transformation to the discrete signal to be detected obtained in step 1, and obtain matrix A;

[0039] The SST transform uses six mother wavelets corresponding to any one of gauss, morlet, mexican hat, complex mexican hat, bump, and hermitian hat.

[0040] For example, the time ...

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Abstract

The invention discloses a power grid harmonic and inter-harmonic analysis method based on SST transformation, and the method comprises the following steps: 1, carrying out the sampling and discretization of a signal of a to-be-detected power system, obtaining a to-be-detected discrete signal, and transmitting the to-be-detected discrete signal to a central processor; 2, carrying out the SST transformation of the to-be-detected discrete signal obtained at step 1 in the central processor, and obtaining a matrix A; 3, carrying out the analysis of the matrix A obtained at step 2 through SST transformation, and obtaining the harmonic and inter-harmonic condition of the to-be-detected electric signal. The method employs the SST transformation, and can obtain a more precise separation result during the separation of complex mixed signals. The method can clearly recognize the weak high-order harmonics and inter-harmonics, and is higher in frequency recognition degree.

Description

technical field [0001] The invention belongs to the technical field of power system power quality, and in particular relates to a method for analyzing harmonics and interharmonics of a power grid based on SST transformation. Background technique [0002] my country's power grid is undergoing profound changes. The power sources in the new generation of power grids are diversified. Clean energy is gradually replacing fossil energy. Wind, solar and tidal renewable energy power generation is continuously connected to the power grid. The complex AC and DC power grid system with multiple sources and multiple transformations is It is one of the characteristics of the current power grid; the trend of power electronics in the power system is also becoming more and more obvious. These changes have brought reliability problems to the power grid, and the resulting power quality problems have attracted more and more attention from the power sector and power grid end users. [0003] Due t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R23/16
CPCG01R23/16
Inventor 李宁满蔚仕
Owner XIAN UNIV OF TECH
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