Detection method of harmonic and inter-harmonic based on single-channel FastICA (Fast Independent Component Analysis)

A detection method and single-channel technology, applied in the field of signal processing, can solve problems such as spectrum leakage, noise sensitivity, and a large number of training samples, and achieve the effect of reducing noise and enhancing energy

Inactive Publication Date: 2014-04-23
STATE GRID CORP OF CHINA +1
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AI Technical Summary

Problems solved by technology

Pisarenko harmonic decomposition method and multi-signal classification method have high frequency resolution, but both need to convert the signal and are sensitive to noise
Methods based on neural networks and support vector machines require a large number of training samples and are accompanied by spectral leakage

Method used

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  • Detection method of harmonic and inter-harmonic based on single-channel FastICA (Fast Independent Component Analysis)
  • Detection method of harmonic and inter-harmonic based on single-channel FastICA (Fast Independent Component Analysis)
  • Detection method of harmonic and inter-harmonic based on single-channel FastICA (Fast Independent Component Analysis)

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Embodiment Construction

[0044] The present invention will be further described in detail below in conjunction with examples, but the embodiments of the present invention are not limited thereto.

[0045] Such as figure 1 As shown, this embodiment is a harmonic and interharmonic detection experiment of an analog signal, and the voltage analog signal is shown in the following formula:

[0046] x(t)=380sinωt+30sin(0.8ωt+π / 6)+20sin(1.6ωt+π / 3)+

[0047] 45sin(3.5ωt+π / 2)+152sin(5ωt+π / 1.5)+e(t)

[0048] In the above formula, ω=50Hz, which is the fundamental frequency; e(t) is white noise with a signal-to-noise ratio of 20dB; the sampling frequency is 1kHz, and the sampling points are 1000.

[0049] First put figure 2 The power quality and voltage signals are preprocessed by cyclic shift, and m=100 and τ=1 are selected to obtain multi-dimensional observation signals. After dimensionality reduction by principal component analysis and separation by independent component analysis and restoration to the obser...

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Abstract

The invention discloses a detection method of harmonic and inter-harmonic based on single-channel FastICA (Fast Independent Component Analysis). The detection method comprises the following steps of separating the harmonic or the inter-harmonic in an original voltage signal or an original current signal, and respectively carrying out fast Fourier transformation on each harmonic or inter-harmonic so as to obtain parameters, such as the frequency, amplitude and phase. Owing to application of a circulation translation method and a principle component analysis method, the harmonic or the inter-harmonic with prior amplitude is easier to detect, the detection method still keeps good accuracy in the larger noise, the problems that the harmonic or the inter-harmonic with the small amplitude is difficult to detect and is sensitive to the noise in the conventional detection method are solved, and a novel detection method is provided for detection of the harmonic or the inter-harmonic in power quality of a power system.

Description

technical field [0001] The present invention relates to a signal processing method, in particular to a signal processing method based on single-channel FastICA for harmonic and interharmonic detection of power system power quality voltage or current signals Background technique [0002] The power system has become the cornerstone of modern society. Now with the formation of the power market environment, power supply has become a commercial service behavior, and electric energy has become a special commodity with various quality parameters and indicators that are directly related to the economic benefits of power companies. . With the increasing number of non-linear devices in the power system, AC-DC converters such as rectifiers, inverters, and frequency converters cause periodic distortions in the waveforms of voltage and current in the power system. From the frequency domain point of view, in these current and voltage waveforms, not only the sinusoidal components with the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R23/16
Inventor 李琪林贺含峰何川舒勤谢正军
Owner STATE GRID CORP OF CHINA
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