HHT harmonic analysis method based on improved EMD modal aliasing and endpoint effect

A technique of endpoint effect and modal aliasing, which is applied in pattern recognition in signals, character and pattern recognition, complex mathematical operations, etc., to achieve the effect of improving harmonic recognition ability

Active Publication Date: 2021-03-05
YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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Problems solved by technology

[0012] This application provides a HHT harmonic analysis method based on improved EMD modal aliasing and endpoint effects, which overcomes the modal aliasing and End effect and other issues, this method is beneficial to improve the detection of power system harmonics, thereby improving the ability of harmonic identification

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  • HHT harmonic analysis method based on improved EMD modal aliasing and endpoint effect
  • HHT harmonic analysis method based on improved EMD modal aliasing and endpoint effect
  • HHT harmonic analysis method based on improved EMD modal aliasing and endpoint effect

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[0058] The embodiments will be described in detail hereinafter, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numerals in different drawings refer to the same or similar elements unless otherwise indicated. The implementations described in the following examples do not represent all implementations consistent with this application. These are merely examples of systems and methods consistent with aspects of the present application as recited in the claims.

[0059] The present invention will be described in detail below in conjunction with the embodiments and the accompanying drawings.

[0060] Such as figure 1 As shown, a kind of HHT harmonic analysis method based on improved EMD modal mixing and endpoint effect of the present invention uses B-spline least square method fitting and slope waveform matching to the original power system harmonic signal x(t) The continuation method is...

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Abstract

The invention relates to an HHT harmonic analysis method based on improved EMD modal aliasing and endpoint effect, and provides an improved HHT harmonic analysis method aiming at the problems that thedecomposition of the Hilbert-Huang Transform (HHT) method for analyzing power harmonic signals at present is easily interfered, the result is inaccurate and the like. According to the method, the harmonic signal of the power system is preprocessed based on the B-spline least square fitting method, the influence of an intermittent event or noise interference on the signal is well weakened, and themodal aliasing phenomenon occurring in classical mode analysis (EMD) decomposition is inhibited; and a slope matching waveform continuation method is adopted for the pre-processed fitting curve to ensure that the change trend at the signal endpoint is consistent with the inside and ensure the integrity of the signal, so that the endpoint effect of EMD decomposition is weakened and even inhibited,and the EMD decomposition result is improved. Therefore, the accuracy of decomposing the harmonic signal of the power system is improved, the harmonic composition in the power harmonic system is rapidly detected, and the application of harmonic detection is expanded.

Description

technical field [0001] The present application relates to the technical field of harmonic detection in power systems, in particular to an HHT harmonic analysis method based on improved EMD modal aliasing and endpoint effects. Background technique [0002] (1) Power system harmonics [0003] Power system harmonics are one of the important indicators of power quality. The existence of harmonics will cause additional losses, increased heat generation, and interference with communication equipment and other hazards on transmission lines and electrical equipment, thus directly affecting normal power consumption. In order to ensure high-quality power supply, it is necessary to detect the harmonics of the power system, analyze the harmonic conditions in the power system, and control the harmonics in time. [0004] (2) Hilbert-Huang Transform (Hilbert-Huang Transform, HHT) principle [0005] HHT is a new time-frequency analysis method proposed by N.E. Huang in 1998 for nonlinear a...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/00G06F17/14
CPCG06F17/14G06F2218/10Y02E40/40
Inventor 李博尹家悦曹敏林伟斌廖耀华肖勇刘斯扬胡珊珊陈叶
Owner YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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