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Measuring method for phase difference of alternating current signals

A measurement method and technology of electrical signals, applied to the phase angle between voltage and current, measuring devices, measuring electrical variables, etc., can solve the problems of inaccurate measurement of phase difference of AC signals, etc., and achieve clear physical concepts and calculations The effect of volume reduction

Inactive Publication Date: 2012-11-28
NANJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to propose a method for measuring the phase difference of the AC signal in view of the inaccurate accuracy of the phase difference measurement of the AC signal in the prior art

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  • Measuring method for phase difference of alternating current signals
  • Measuring method for phase difference of alternating current signals
  • Measuring method for phase difference of alternating current signals

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Embodiment Construction

[0033] The technical scheme of the present invention is described in detail below in conjunction with accompanying drawing:

[0034] The essence of the present invention is to calculate the zero-crossing point of the signal through table look-up after preprocessing several sampling points; and then calculate the period of the signal and the phase difference between different signals by a series of zero-crossing points. The selection of sampling points should not be too many, if more sampling points are selected, the calculation will be more complicated; the selection of sampling points should not be too small, if the selection of sampling points is less, it will be easily affected by interference. Therefore, users can select a reasonable combination and number of sampling points for calculation according to their needs.

[0035] In order to obtain more accurate measurement results, the suggested selection scheme of sampling points is: the number of positive sampling points is ...

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Abstract

The invention provides a measuring method for the phase difference of alternating current signals. The method comprises the following steps: firstly, pre-treating a sampling value; then, looking up a table, calculating zero crossing point time for two paths or multiple paths of alternating current signals to increase; calculating the period of the signal according to the zero crossing point; and finally, calculating the phase difference between the signals by utilizing the difference of the zero crossing point time of different signals and the periods of the signals. In the measuring method, the alternating current signal does not need to be converted into square waves, and the defect of poor antijamming capability of the traditional zero crossing point detection can be overcome. The method is also suitable for measuring the phase difference of low-frequency signals, the system is convenient to detect, the hardware cost is small, and the antijamming capability of the system is strong.The measuring method is simple and reasonable to realize, and the data is accurate and reliable, thus the measuring method has a wide application prospect.

Description

technical field [0001] The invention relates to a phase difference measurement method of an alternating current signal, and the invention can be widely used in power system automation fields such as generator power angle measurement. Background technique [0002] In daily life and production process, it is often necessary to measure the phase difference between AC signals. The more accurate the measured phase difference is, the better the application effect is. In the existing phase difference measurement methods, most of them convert the signal into a square wave, and then measure the time difference between the rising edges of the two square waves to obtain the phase difference of the two signals. This method is easy to implement but requires Additional hardware and are susceptible to interference. Contents of the invention [0003] The technical problem to be solved by the present invention is to propose a method for measuring the phase difference of the alternating cu...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R25/00
Inventor 戴尔晗
Owner NANJING UNIV OF POSTS & TELECOMM
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