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Signal harmonic analysis method and system based on Hamming product window

A technology of harmonic analysis and product window, which is applied in the field of harmonic spectrum analysis of power systems, can solve problems such as large harmonic analysis errors, difficult frequency measurement and harmonic analysis, and long time consumption, so as to ensure real-time performance and accuracy, The effect of small amount of calculation and high practicability

Inactive Publication Date: 2014-09-24
WUHAN UNIV
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Problems solved by technology

However, due to the unsatisfactory spectral side lobe characteristics of the above window function, the suppression effect on spectrum leakage is limited, resulting in large harmonic analysis errors, and it is difficult to achieve high-precision frequency measurement and harmonic analysis, and the calculation process is complicated and time-consuming, which is difficult to meet Real-time and Accurate Requirements for Power System Harmonic Analysis

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  • Signal harmonic analysis method and system based on Hamming product window
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  • Signal harmonic analysis method and system based on Hamming product window

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Embodiment Construction

[0036] The invention realizes the harmonic detection of the power system signal based on the Hamming product window, and the Hamming product window w hamming-m (n) Through several Hamming windows w hamming (n) multiplied to obtain:

[0037]

[0038] In formula (1), p is the number of Hamming windows to be multiplied. In the specific implementation, the p value is selected according to the actual situation and experience. Generally speaking, the larger the p value, the lower the peak height of the side lobe of the Hamming product window, but the wider the main lobe. A suitable window function requires a narrow main lobe and low side lobes.

[0039] In this specific implementation, the cosine Hamming window w is used hamming (n), which has small sidelobe peaks:

[0040] w ham min g ( n ) = 0.54 - 0.46 ...

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Abstract

The invention discloses a signal harmonic analysis method and system based on a Hamming product window. The method includes the steps that discrete signals are windowed through the Hamming product window, and FFT is conducted on the windowed signals and the Hamming product window; actual fundamental frequency and the amplitude and the phases of sub-harmonics are acquired according to a signal spectrogram obtained after FFT and the Hamming product window obtained after FFT. The Hamming product window is combined with FFT, and harmonic analysis with extremely high accuracy can be achieved in an asynchronous sampling state; meanwhile, the signal harmonic analysis method and system further have the advantages of being small in calculated amount, short in consumed time, high in practicability and the like.

Description

technical field [0001] The invention relates to a method for analyzing harmonic spectrum of a power system, in particular to a method and system for analyzing signal harmonics based on a Hamming product window. Background technique [0002] Nonlinear loads in power systems can lead to deterioration of power quality. In the actual signal processing process, the accuracy of signal processing will be affected by the change of power quality. The asynchronous sampling caused by the fluctuation of fundamental frequency will lead to spectrum leakage and fence effect, so that the power system can detect harmonic amplitude, Both the phase angle and frequency have large errors, which cannot meet the accuracy requirements. The fence effect can be solved by interpolation, but the measurement error caused by the spectrum leakage phenomenon still exists. Discrete Fourier analysis after windowing the signal can reduce the error of spectrum leakage, but the process is complicated and the ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R23/16G06F19/00
Inventor 武婕刘开培乐健汪立彭宏亮陈宜皇高云鹏
Owner WUHAN UNIV
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