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Asynchronous compressed sensing detection method for power grid harmonic waves added with continuous Hanning windows

A technology of compressed sensing and detection methods, which is applied to measurement devices, measurement electrical variables, instruments, etc., can solve the problems of low efficiency of reconstruction algorithms, poor detection accuracy, and deterioration of signal frequency domain sparsity, so as to improve reconstruction efficiency. and detection accuracy, the effect of reducing the impact

Active Publication Date: 2019-05-03
陕西星见动能电气科技有限公司
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Problems solved by technology

[0005] In order to effectively solve the problem that the signal sparsity in the frequency domain becomes worse due to the asynchronous sampling of the RD-AIC, and then cause the problems of low efficiency of the reconstruction algorithm and poor detection accuracy, the present invention provides a grid harmonic with continuous Hanning window Wave Asynchronous Compressed Sensing Detection Method

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  • Asynchronous compressed sensing detection method for power grid harmonic waves added with continuous Hanning windows
  • Asynchronous compressed sensing detection method for power grid harmonic waves added with continuous Hanning windows
  • Asynchronous compressed sensing detection method for power grid harmonic waves added with continuous Hanning windows

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Embodiment 1

[0124] Discrete Fourier transform is performed on the signals of power grid harmonics generated by formula (16) under synchronous sampling, asynchronous sampling and asynchronous plus continuous Hanning window sampling, and the three amplitude spectra obtained respectively are as follows: image 3 As shown, the amplitude and relative error of each harmonic are shown in Table 1.

[0125] Table 1

[0126]

[0127] When sampling synchronously, the sampling frequency is set to an integer multiple of the power frequency. At this time, the spectrum leakage phenomenon will not occur in the amplitude spectrum of each harmonic. The sparsity of the harmonic signal in the frequency domain is the best and the amplitude of each component can be accurate. Detection; when sampling asynchronously, because the sampling frequency is not an integer multiple of the power frequency, the amplitude spectrum will leak due to non-full cycle sampling, the sparsity of the harmonic signal will become ...

Embodiment 2

[0130] according to figure 2 Specifically implement steps 1 and 2) Firstly, generate grid harmonic signal x with continuous Hanning window 1 (t) into the RD-AIC, and with the frequency of 10kHz pseudo-random sequence p c (t) multiplied, the output signal y 1 The time-frequency waveform of (t) is as follows Figure 4 (1) shown. As a comparison, the harmonic signal x(t) without continuous Hanning window is sent to RD-AIC, and it is compared with the pseudo-random sequence p with frequency of 10kHz c (t) multiplied, the time-frequency waveform of the output signal y(t) is as follows Figure 4 As shown in (2); secondly, the y 1 (t) and y(t) are sent to the low-pass filter respectively, and the output signal y' 1 (t) and y’(t), the time-frequency waveforms are as follows Figure 5 (1), (2); finally y' 1 (t) and y’(t) are respectively sent to the low-speed ADC, and the output observation signal y 1 (m) and y(m), the time-frequency waveforms are as follows Image 6 (1) and...

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Abstract

An asynchronous compressed sensing detection method for power grid harmonic waves added with continuous Hanning windows comprises the following steps that a continuous Hanning window signal function is derived and defined; an orthogonal decomposition model of power-grid harmonic signals added with the continuous Hanning windows under continuous fourier transform and generalized Fourier series is analyzed, and a finite item orthogonal decomposition and K-sparse reference model of continuous signals under discrete Fourier transform is provided; an input and output observation model of the power-grid harmonic signals added with the continuous Hanning windows in a random analog information converter is derived; and a formula to recover a reconstructed signal into an original power grid harmonic signal is corrected. The method can reduce the generation frequency of pseudo random sequences in the random analog information converter, solves the problem of frequency spectrum leakage due to thefactor that the low-speed ADC sampling frequency is asynchronous with the power grid fundamental wave frequency, and further improves the efficiency of a signal reconstruction algorithm and the amplitude detection precision of different harmonic components.

Description

technical field [0001] The invention belongs to the technical field of harmonic detection, relates to asynchronous sampling detection of electric network harmonics, and in particular to a method for detecting electric network harmonic asynchronous compressed sensing with continuous Hanning windows. Background technique [0002] Accurate detection of harmonic signals is the basis and premise of controlling harmonic pollution in power grids. As a new signal processing method, Compressed Sensing (CS) theory breaks through the limitations of Nyquist sampling theorem, and provides a new idea for the detection of power grid harmonic signals. If the signal to be detected is K-sparse under a certain basis function, the detection method using this theory has the advantages of asynchronous observation and reconstruction with high compression ratio. [0003] Analog-to-information converter (AIC) is a cutting-edge technology that extends CS theory to analog signals. There are currentl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R23/165
Inventor 刘嫣汤伟刘宝泉
Owner 陕西星见动能电气科技有限公司
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