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Method for inhibiting power supply frequency disturbance

A power supply frequency and channel technology, applied in the direction of measuring devices, instruments, special recording/indicating devices, etc., can solve problems such as signal waveform distortion and signal distortion

Active Publication Date: 2017-05-31
INST OF HIGH SPEED AERODYNAMICS OF CHINA AERODYNAMICS RES & DEV CENT
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Problems solved by technology

However, filtering will filter out the part of the signal corresponding to the stop band at the same time. When the signal is a transient signal, or when the signal frequency stop band contains large energy, filtering will cause large distortion of the signal.
figure 1 It is a rectangular pulse with a width of 5ms and its waveform after passing through a 50Hz band-stop filter. It can be seen that the signal waveform is seriously distorted

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  • Method for inhibiting power supply frequency disturbance

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Embodiment Construction

[0025] The invention mainly includes three parts: a phase tracking method, a noise acquisition method, and a noise subtraction method.

[0026] 1. Phase tracking method

[0027] The phase information of noise is necessary in both noise acquisition and noise subtraction.

[0028] Since the power supply frequency is not strictly 50Hz and 60Hz, for my country's power grid, if the nominal power supply frequency of 50Hz is used to calculate the phase from the initial moment, in the most unfavorable case, the power supply frequency deviation is 1Hz, and only 0.5s is needed to calculate the phase and The real phase difference can reach 180°, and the correction will reverse the phase, resulting in double the deviation. Therefore, the phase must be continuously tracked.

[0029] The phase reference channel is required for both the noise acquisition process and the phase tracking during the noise subtraction process. The phase reference channel is one of the multiple acquisition chann...

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Abstract

The invention discloses a method for inhibiting power supply frequency disturbance, wherein the method includes phase position tracking, noise acquisition and noise removal. Specific to the shortcoming of signal distortion easily caused by a common filter noise reduction method, the method for inhibiting power supply frequency disturbance by removing noise is provided according to the property that the noise caused by the power supply frequency disturbance is in synchronism with the power supply frequency and the noise waveform is unchanged under a certain condition, thus the process of inhibiting noise cannot cause the distortion of a real signal. The basic principle of the method is to collect noise when the signal output is zero or constant value, and average the noise periodically so as to inhibit the random noise, and acquire a reference noise with different phase positions in one cycle; through a certain algorithm, the phase position of the noise-containing signal is matched with the reference noise, thereby subtracting the reference noise of corresponding phase position.

Description

technical field [0001] The invention belongs to the technical field of signal acquisition and processing, and in particular relates to a method for suppressing power supply frequency interference. Background technique [0002] In dynamic signal acquisition, due to various conditions of the signal test site, measures to reduce noise in the signal are often difficult to implement, or due to strong interference on site, even if measures to reduce noise are adopted, the obtained signal still contains relatively large noise . For this kind of interfered signal, the usual processing method is to suppress the noise and improve the signal-to-noise ratio through filtering (including smoothing). However, filtering will also filter out the part of the signal corresponding to the stop band. When the signal is a transient signal, or when the signal frequency stop band contains large energy, filtering will cause large distortion of the signal. figure 1 It is a rectangular pulse with a w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D3/032
CPCG01D3/032
Inventor 杨海泳赵忠良李玉平马上王晓冰余立梁锦敏陈建中冯黎明陶洋李乾
Owner INST OF HIGH SPEED AERODYNAMICS OF CHINA AERODYNAMICS RES & DEV CENT
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