Electric power signal zero crossing point detection method

A zero-crossing detection and power signal technology, which is applied to measuring devices, measuring electrical variables, measuring current/voltage, etc., can solve problems such as inaccurate judgment of real zero-crossing points, errors in power signal calculation and analysis, etc.

Inactive Publication Date: 2013-07-10
ANHUI RESOURCE SAVING & ENVIRONMENTAL TECH CO LTD
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Problems solved by technology

[0003] In order to solve the problem that in the prior art, due to the influence of high-order harmonics, there are multiple zero-crossing points in the power signal, and the inaccurate judgme

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  • Electric power signal zero crossing point detection method
  • Electric power signal zero crossing point detection method
  • Electric power signal zero crossing point detection method

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[0020] The technical solution of the present application will be described in further detail below in conjunction with the accompanying drawings.

[0021] as attached figure 1 Shown is the power signal zero-crossing detection method disclosed in this application, and the specific steps are as follows:

[0022] (1) Collect power signal data at a fixed sampling frequency to obtain the data values ​​of the power signal at each sampling point Sample[1], Sample[2]...Sample[N], where N is the number of sampling points per cycle, usually The number of sampling points is 128, 256 or 512, etc., and the N value has a great relationship with the subsequent threshold value.

[0023] (2) Among all the power signal data sampling point data values, if the following conditions are met, the sampling point data is judged to be a possible zero-crossing point of the power signal. The process is as follows: figure 2 Shown:

[0024] Extract the collected data Sample[], if the collection frequen...

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Abstract

The invention belongs to the technical field of electric power signal analysis in electric power systems, and particularly relates to a zero point judging method based on electric power system sampling signals. An electric power signal zero crossing point detection method is mainly characterized by being capable of correcting errors of zero point judgment by high frequency harmonic interference, optimally selecting real zero crossing points, removing jump points and restraining errors caused by voltage and current events. Through a series of scientific and accurate methods, zero crossing points of electric power sinusoidal signals can be selected step by step.

Description

technical field [0001] The invention belongs to the technical field of power system power signal analysis, and in particular relates to a zero point judgment method based on power system sampling signals, which plays an important role in power signal analysis and is applied to power signal frequency analysis and the like. Background technique [0002] The power signal data acquisition card converts continuous signals into discrete data. Theoretically, if a stable and undisturbed periodic signal collects more than 10 points in each cycle, the signal can be analyzed and the measured signal can be completely restored. . But actually the signal is not ideal due to the complexity of the power system. Data sampling 10 points is not enough for signal analysis or deeper analysis. Therefore, the data sampling points are often more than 10 points (currently, the number of sampling points is 128, 256). It is precisely because of the instability of the power signal and the increase i...

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Application Information

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IPC IPC(8): G01R19/175
Inventor 胡显三王徽刘治恩
Owner ANHUI RESOURCE SAVING & ENVIRONMENTAL TECH CO LTD
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