Voltage flicker detection method based on windowing interpolation short-time Fourier transform

A short-time Fourier transform and voltage flicker technology, which is applied in the direction of measuring current/voltage, measuring electricity, measuring devices, etc., can solve the problems of low recognition rate, large amount of calculation, complicated calculation process, etc., and achieve high recognition rate, The effect of less feature extraction and simple calculation process

Active Publication Date: 2016-06-15
HUNAN UNIV
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[0004] A voltage flicker detection method based on windowed interpolation short-time Fourier transform proposed by the present invention ove

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  • Voltage flicker detection method based on windowing interpolation short-time Fourier transform
  • Voltage flicker detection method based on windowing interpolation short-time Fourier transform
  • Voltage flicker detection method based on windowing interpolation short-time Fourier transform

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[0021]The invention proposes a voltage flicker detection method based on windowed interpolation short-time Fourier transform. Describe in detail below in conjunction with accompanying drawing:

[0022] The principle block diagram of flicker detection of the present invention is as figure 1 As shown, firstly, the time-domain voltage signal is processed by short-time Fourier transform to obtain the amplitude matrix of the signal, and the frequency and amplitude of the voltage envelope are calculated according to the amplitude matrix, and then the mean value of the characteristic envelope amplitude V is extracted 1 , the number of envelope large value sampling points V 2 , Envelope small-amplitude sampling points V 3 , the envelope is too small amplitude sampling points V 4 and envelope fluctuation characteristic quantity V 5 , and calculate the characteristic quantity of flicker duration V 6 , then according to V 1 , V 2 , V 3 , V 4 , V 5 and weight coefficient c 1 、c...

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Abstract

The invention discloses a voltage flicker detection method based on windowing interpolation short-time Fourier transform. The method mainly comprises the steps that 1) voltage signals are sampled discretely to obtain a sampling sequence U(n) of N points; 2) a Blackman-Harris triangular convolution window is used to weight the sampling sequence U(n) and carry out short-time Fourier transform to obtain an amplitude matrix P (i, j) of the singals; 3) a polynomial fitting method is applied to solve an amplitude expression yj(k) of each column of the matrix P (i, j); 4) according to the expression yj(k), a voltage signals envelope frequency fm(j) is calculated; 5) according to the envelope amplitude ymax(j) and the envelope frequency fm(j), characteristic quantities V1, V2, V3, V4, V5 and V6 are extracted; and 6) the characteristic quantities V1, V2, V3, V4 and V5 are used to calculate a signal flicker coefficient T, and compared with a threshold corresponding to V6, and a detection result is provided. The method is based on the windowing interpolation short-time Fourier transform, characteristic quantities are extracted, calculation is simple, the extracted characteristic quantities are fewer, the recognition is high, and requirement for rapid flicker detection in the power system can be met.

Description

technical field [0001] The invention belongs to the technical field of power system fault analysis, and relates to a voltage flicker detection method based on short-time Fourier transform with windowing interpolation. Background technique [0002] With the continuous development of my country's economy, the demand for electricity continues to increase, and the construction of large-scale power plants and long-distance and large-scale transmission networks is accelerated, making the power grid system vulnerable to disturbances; coupled with the use of various power electronic equipment and impact and nonlinear loads , A series of problems such as flicker, voltage sag, voltage swell, voltage fluctuation, harmonic, voltage gap, pulse and oscillation transient interference have appeared, which directly affect the safety and stability of power quality and grid operation. Flicker is the visual response of the human eye to the instability of light illumination caused by voltage fluc...

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Application Information

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IPC IPC(8): G01R19/00G01R31/00
CPCG01R19/00G01R31/00
Inventor 温和张军号黎福海滕召胜唐璐郭斯羽高友丽陈倩文李橙橙
Owner HUNAN UNIV
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