Voltage flicker detection algorithm based on improved HHT (Hilbert-Huang Transform)

A detection algorithm and voltage flicker technology, applied in the field of signal processing, can solve the problems of long running time, affecting the detection accuracy of flicker parameters, unsatisfactory IMF components, etc., and achieve the effect of improving detection accuracy

Inactive Publication Date: 2017-05-31
NANJING INST OF TECH
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Problems solved by technology

The atomic decomposition method detects the voltage flicker signal, and the accuracy of the detection parameters is high, but the calculation amount is large and the running time is long
The voltage flicker detection method combining Prony and Hilbert selects the algorithm based on Hilbert transform to detect the voltage fluctuation signal, and introduces th...

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  • Voltage flicker detection algorithm based on improved HHT (Hilbert-Huang Transform)
  • Voltage flicker detection algorithm based on improved HHT (Hilbert-Huang Transform)
  • Voltage flicker detection algorithm based on improved HHT (Hilbert-Huang Transform)

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Embodiment Construction

[0030] Below in conjunction with accompanying drawing of description, the present invention will be further described.

[0031] Such as Figure 1-4 As shown, the present invention provides a kind of voltage flicker detection algorithm based on improved HHT, comprises the following steps:

[0032] 1) For the collected discrete voltage signal, use the Hilbert transform method to extract the voltage envelope signal a ( t ),Specifically,

[0033] (1)

[0034] (2)

[0035] In the formula: X ( t ) is the extracted voltage signal, Y ( t ) is the Hilbert transform of X(t), * means convolution; t Indicate time; τ Indicates the integral component.

[0036] 2) The EMD "screening" step is improved by "splitting" new control points using a four-point interpolation subdivision algorithm, specifically,

[0037] given control point , k =0,1,2... n ,in i Indicates the serial number of the control point, k Indicates the number of layers of control points; when k =0, i...

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Abstract

The invention discloses a voltage flicker detection algorithm based on improved HHT (Hilbert-Huang Transform). The voltage flicker detection algorithm comprises the following steps: 1) extracting voltage envelope signals from collected discrete voltage signals by using a Hilbert transform method; 2) in an empirical mode decomposition (EMD) 'screening' step, 'splitting' a new control point for three times of spline interpolation fitting of an envelope line by using a four-point interpolation subdivision algorithm, and optimizing the new control point by the method; and 3) decomposing the voltage envelope signals by using improved EMD so as to obtain a group of intrinsic mode functions (IMF), and extracting flicker amplitude values and flicker frequency parameters from the group of decomposed IMF by using the Hilbert transform method respectively. The voltage flicker detection algorithm disclosed by the invention effectively overcomes the problem that parameter detection errors are increased due to unsatisfactory IMF generated by EMD, thereby obtaining a parameter detection result with higher precision.

Description

technical field [0001] The invention relates to a voltage flicker detection algorithm based on an improved HHT, and belongs to the technical field of signal processing. Background technique [0002] The large number of distributed power sources in the power grid and the input of various nonlinear, impact and fluctuating loads have aggravated the voltage fluctuations in the power grid, and the frequent occurrence of voltage flicker in the power grid has seriously affected industrial production and social life. . Power supply and utilization companies hope to detect accurate voltage flicker parameters, so that they can install compensation equipment in a targeted manner to control voltage flicker, so as to improve power quality. [0003] In recent years, voltage fluctuation and flicker detection problems have gradually become research hotspots. IEC has given a detection principle block diagram for measuring flicker intensity values. Scholars have proposed a variety of short-t...

Claims

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Application Information

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IPC IPC(8): G06Q10/06G06Q50/06
CPCG06Q10/06395G06Q50/06
Inventor 倪良华肖李俊黄淮
Owner NANJING INST OF TECH
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