Electric energy quality analyzing method based on Hilbert-Huang transform

A technology of power quality analysis and power quality, applied in spectrum analysis, measurement of electrical variables, measurement devices, etc., can solve problems that are not suitable for actual analysis

Inactive Publication Date: 2012-01-18
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology

Hilbert-Huang transformation is applied to power quality analysis, which is basically implemented in Matlab scri

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  • Electric energy quality analyzing method based on Hilbert-Huang transform
  • Electric energy quality analyzing method based on Hilbert-Huang transform
  • Electric energy quality analyzing method based on Hilbert-Huang transform

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Embodiment Construction

[0041] Embodiment of the present invention is described in detail below in conjunction with accompanying drawing: present embodiment implements under the premise of technical scheme of the present invention, has provided detailed implementation process, but protection scope of the present invention is not limited to following embodiment.

[0042]This embodiment takes the current harmonic analysis of the α-phase feeder on the traction side of a certain traction substation as an example.

[0043] like figure 1 As shown, the present invention includes: a hardware part and a software part. The hardware platform realizes the acquisition of power quality data, and its main functions are signal conditioning and data acquisition; the software part is divided into a data interface module, an algorithm module, and a display and storage module to realize the analysis of power quality.

[0044] The power quality analysis flow process of the present invention is as figure 2 shown. In t...

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Abstract

The invention discloses an electric energy quality analyzer based on Hilbert-Huang transform, which comprises an electric energy quality actual measurement data acquisition part and an electric energy quality analysis part. The electric energy quality actual measurement data acquisition part can be used for realizing the acquisition of electric energy quality data and is mainly used for conditioning signals and acquiring data; and the electric energy quality analysis part can be used for realizing the detection of transient disturbance characteristic of electric energy quality and the analysis of harmonics by using the Hilbert-Huang transform as a core algorithm. According to the electric energy quality analyzer disclosed by the invention, a method for automatically configuring a superposed high-frequency strong signal during mode mixing for improving the transient oscillation analysis as well as a self-adaptive design scheme of a filter during mode mixing for improving the harmonic analysis are established. The analyzer can be used for realizing the theoretical research on a power system together with a PSCAD /EMTDC ((Power System Computer Aided Design/Electro Magnetic TransientsIncluding DC) under a simulation analysis mode, realizing the quality detection for electric energy of a power grid together with an actual measurement data interface in an actual measurement analysis mode as well as analyzing the actual operation condition of the power system.

Description

technical field [0001] The invention relates to a power quality analyzer based on Hilbert-Huang transformation. Background technique [0002] As a commodity in the production activities of human society, electric energy needs to pay attention to quality. High-quality electric energy is of great significance to ensure the safe and economical operation of power grids and electrical equipment, improve product quality, output, and people's normal life. Therefore, it is very important to detect and analyze the power quality. The objects analyzed by modern power quality analysis devices are mostly traditional power quality of some steady-state indicators, and the development of practical analysis devices for transient disturbances of power quality is slow. With the development of signal processing technology, it provides an effective way to analyze transient power quality problems. [0003] Fourier transform is the most commonly used power system signal analysis method, Wang Lim...

Claims

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Application Information

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IPC IPC(8): G01R23/165G01R19/25
Inventor 刘志刚李文帆
Owner SOUTHWEST JIAOTONG UNIV
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