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Method for identifying voltage sag source based on multi-resolution singular value decomposition

A technology of singular value decomposition and voltage sag source, applied in instruments, fault detection by conductor type, data processing applications, etc., can solve the problems of identification result deviation, singular point detection position deviation, etc., to achieve the effect of improving accuracy

Inactive Publication Date: 2019-03-15
HUZHOU ELECTRIC POWER SUPPLY CO OF STATE GRID ZHEJIANG ELECTRIC POWER CO LTD +1
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Problems solved by technology

However, as the decomposition scale increases, the detection position of the singular point will shift, resulting in deviation of the recognition results.

Method used

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  • Method for identifying voltage sag source based on multi-resolution singular value decomposition
  • Method for identifying voltage sag source based on multi-resolution singular value decomposition
  • Method for identifying voltage sag source based on multi-resolution singular value decomposition

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Embodiment Construction

[0041] The present invention will be described in further detail below through specific embodiments and in conjunction with the accompanying drawings.

[0042] Described in the embodiment of the present invention is a voltage sag source identification method based on multi-resolution singular value decomposition, such as figure 1 As shown, the method includes the following steps:

[0043] Step 1. Construct the second-order Hankel matrix H of the voltage signal;

[0044] Obtain the continuous voltage signal H(t) of the distribution network, and discretize it to get X=[X 1 ,X 2 ,...,X n ], to construct the second-order Hankel matrix H of the voltage signal:

[0045]

[0046] Step 2, carry out singular value decomposition to the second-order Hankel matrix H of the voltage signal by multi-resolution singular value decomposition (MRSVD), and obtain a group of approximate signal components H 1 and the detail signal component D 1 ;

[0047] H=σ 1 u 11 v 11 T +σ 2 u 12 v...

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Abstract

The invention aims at providing a method for identifying a voltage sag source based on multi-resolution singular value decomposition. Firstly, a second-order Hankel matrix is constructed for voltage signals, MRSVD analysis is conducted, a group of component signals of different frequencies are obtained, then an energy moment of the component signals is obtained, the main features of the signals are effectively extracted, a recognition feature vector is formed, and an LS-SVM recognition model is input for voltage sag source recognition.

Description

technical field [0001] The invention relates to the field of voltage sag source identification, in particular to a voltage sag source identification method based on multi-resolution singular value decomposition. Background technique [0002] With the rapid development of smart grid, power quality has become the focus of the power sector. Among them, analyzing the hazard degree of voltage sag, identifying the source of sag and taking corresponding measures have become the difficulties in improving power quality. In recent years, many scholars have done a lot of research on sag source identification and achieved excellent results. [0003] Liu Yingying and other scholars analyzed and located the source of voltage sags by using multiple criterion methods; some literatures used Hilbert-Huang transform to realize the detection of transient power quality disturbance signals. Among the crowd analysis methods, the wavelet transform has multi-scale characteristics, and can simultan...

Claims

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Application Information

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IPC IPC(8): G01R31/08G06Q50/06
CPCG01R31/086G06Q50/06
Inventor 施康明
Owner HUZHOU ELECTRIC POWER SUPPLY CO OF STATE GRID ZHEJIANG ELECTRIC POWER CO LTD
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