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Power system HHT harmonious wave detection method based on improved EMD end point effect

A technology of power system and endpoint effect, applied in the direction of spectrum analysis/Fourier analysis, etc., can solve problems affecting the effect of HHT analysis

Inactive Publication Date: 2014-07-23
FUZHOU UNIV
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Problems solved by technology

However, there are still defects and deficiencies in boundary processing, mode mixing and curve fitting, which affect the analysis effect of HHT, and need to be optimized and improved.

Method used

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  • Power system HHT harmonious wave detection method based on improved EMD end point effect
  • Power system HHT harmonious wave detection method based on improved EMD end point effect
  • Power system HHT harmonious wave detection method based on improved EMD end point effect

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Embodiment Construction

[0072] The technical solution of the present invention will be specifically described below in conjunction with the accompanying drawings.

[0073] The invention is a power system HHT harmonic detection method based on the improved EMD endpoint effect. The endpoint effect is improved by the method of image continuation, and the EMD decomposition of the power system harmonic is carried out by using the improved image method, and the Hilbert transformation is used. The time-frequency characteristics of the harmonic signal are obtained by decomposing the harmonics of the power system after EMD decomposition;

[0074] The power system HHT harmonic detection method combines figure 1 be described, and the power system harmonic signal Using the mirror image method before and after improvement to simulate, the effect diagram is shown in the appendix Figure 2-11 , specifically follow the steps below:

[0075] Step 1: Select extreme points and endpoints as parameter variables, def...

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Abstract

The invention relates to the field of detection of harmonious waves in power systems, in particular to a power system HHT harmonious wave detection method based on improved EMD end point effect. The method comprises the steps of selecting end points and extreme point as reference variables and comparing the relation of the end points and extreme point according to a signal boundary distorting phenomenon occurred in the EMD decomposition course, adopting a mirror image extension method to improve the end point effect, utilizing an improved mirror image method to perform EMD decomposition on the power system harmonious waves so as to obtain all of intrinsic mode function (IMF), utilizing Hilbert conversion to perform decomposition on the power system harmonious waves subjected to the EMD decomposition so as to obtain signal time-frequency characteristics. The power system HHT harmonious wave detection method facilities rapid detection of harmonious wave composition of the power system harmonious waves, accordingly improves the power system harmonious wave recognition capability and is suitable for power systems and relevant departments and used for power system harmonious wave detection.

Description

technical field [0001] The invention relates to the field of harmonic detection in electric power systems, in particular to an HHT harmonic detection method in electric power systems based on improved EMD endpoint effects. Background technique [0002] Power system harmonics are one of the important indicators of power quality, and the existence of harmonics directly affects the normal power consumption of power users. The detection of power system harmonics is the basis for dealing with power system harmonics. In order to ensure high-quality power supply, it is necessary to detect power system harmonics. [0003] At present, the commonly used harmonic detection methods in power systems mainly include analog filter method, harmonic detection method based on instantaneous reactive power, harmonic detection method based on Fourier transform, and harmonic detection method based on wavelet transform. method. The analog filter circuit is easy to implement and low in cost, but i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R23/16
Inventor 金涛顾小兴程远段小华
Owner FUZHOU UNIV
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