Detection method of transient harmonic signals of power system based on combination of Tsallis wavelet singular entropy and FFT computation

A harmonic signal and power system technology, which is applied in the field of detection of transient harmonic signals in power systems, can solve the problem of inability to extract the frequency and power information of transient harmonic signals, and achieves improved computing speed, strong practicability, and accuracy. Extracted effects
CN101672873AInactive Publication Date: 2010-03-17HARBIN INST OF TECH
0 Cites 19 Cited by

Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
HARBIN INST OF TECH
Publication Date
2010-03-17
Estimated Expiration
Not applicable · inactive patent

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The invention relates to a detection method of transient harmonic signals of a power system based on the combination of Tsallis wavelet singular entropy and FFT computation, which can solve the problem that the prior art can not extract the frequency and the power information of the transient harmonic signals of the power system. The detection method comprises the following steps: carrying out theFFT computation on current signals, determining the sampling frequency and the decomposition scale of the mallat algorithm computation according to the result, carrying out the mallat algorithm computation on the current signals, carrying out the Tsallis wavelet singular entropy computation on wavelet coefficients with abnormal singularity degree or single-branch wavelet reconstruction signals, obtaining the occurrence time and the continuous time of the transient harmonic signals, further carrying out the time segmentation on all the wavelet coefficients of the wavelet scales with the frequency of higher than 650Hz or the single-branch wavelet reconstruction signals, carrying out the FFT computation analysis on the wavelet coefficients or the single-branch wavelet reconstruction signalsin all the time periods, and finally obtaining the frequency and the power information of the transient harmonic signals in all the time periods. The detection method overcomes the deficiencies in theprior art and can be used for detecting the transient harmonic signals of the power system.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention relates to a detection method for a transient harmonic signal of a power system. Background technique

[0002] For the power system grid, the harmonic signal is a kind of harmful pollution signal. It can cause additional loss and heat increase of rotating equipment and transformers, and can also cause rotating equipment and transformers to vibrate and emit noise. Long-term vibration will cause Metal fatigue and mechanical damage; the main harm of harmonic signals to the line is to cause additional loss; harmonic signals can cause the inductance and capacitance of the system to resonate, and amplify the transient harmonic signals, resulting in an increase in voltage and current. Cause relay protection and safety automatic devices to malfunction, damage system equipment, cause system accidents, and threaten the safe operation of the power system; in addition, harmonic signals can also interfere with communication equipment, increase power l...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More