Real-time waveform reconstruction method based on three-point asynchronous sampling

A real-time waveform and waveform reconstruction technology, applied in digital variable/waveform display, measurement devices, instruments, etc., can solve real-time waveform data synchronization errors and other problems, and achieve the effect of avoiding errors

Active Publication Date: 2016-02-24
杭州佳和电气股份有限公司
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Problems solved by technology

[0005] The main purpose of the present invention is to provide a real-time waveform reconstruction method based on three-point asynchronous sampling, through which the synchronization error problem of real-time waveform data acquisition can be solved

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  • Real-time waveform reconstruction method based on three-point asynchronous sampling
  • Real-time waveform reconstruction method based on three-point asynchronous sampling
  • Real-time waveform reconstruction method based on three-point asynchronous sampling

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Embodiment Construction

[0024] like figure 1 As shown, the real-time waveform reconstruction method based on three-point asynchronous sampling of the present invention comprises the following steps:

[0025] (1) with a fixed frequency The signal is sampled at equal intervals to obtain N+2 sampling points, and the sampling points are saved as original sampling samples at the same time. N is the number of sampling points in one cycle, which is an integer multiple of 4.

[0026] (2) Filter the sampling signal through a band-pass FIR filter to extract the fundamental wave signal.

[0027] (3) Calculation of waveform reconstruction parameters ,Specific steps are as follows:

[0028] Select three intervals from the filtered signal as The sampling value of , as well as ,in .

[0029] Determining Waveform Reconstruction Parameters ,in , .

[0030] (4) Extract the original sampling sample, through three consecutive asynchronous sampling points , , Compute each synchronously sample...

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Abstract

The invention provides a real-time waveform reconstruction method based on three-point asynchronous sampling. The real-time waveform reconstruction method comprises the following steps that equal interval sampling of signals is performed according to fixed sampling frequency; frequency components apart from fundamental wave are filtered by a digital filter; a waveform reconstruction parameter deltak is calculated by selecting three sampling points after filtering processing; and software resampling is performed on an original sampling sequence by utilizing the parameter, a time domain sampling location is changed in real time and a synchronous sampling sequence is obtained, and a signal waveform is reconstructed. According to the method, error caused by incomplete synchronous sampling can be avoided so that real-time performance is high, calculation is convenient and realization is easy.

Description

technical field [0001] The invention relates to the field of power system signal processing, in particular to a real-time waveform reconstruction method based on three-point asynchronous sampling. Background technique [0002] With the development of power electronics technology, a large number of nonlinear devices are put into use in the power system, resulting in the decline of power quality. The acquisition of real-time waveform data is of great significance to understand the actual situation of the power system and improve the power quality. [0003] Obtaining real-time waveform data usually requires sampling the continuous waveform and converting the analog signal into a discrete digital sequence in order to obtain relevant information through digital signal processing. In order to maintain the synchronization of sampling, the existing technology usually adjusts the length of the sampling period in real time according to the change of the signal frequency, mainly inclu...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R13/00
CPCG01R13/00
Inventor 蒋艳钱晟
Owner 杭州佳和电气股份有限公司
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