Method for measuring phase difference of alternating current in digital mode
A technology of phase difference and alternating current, applied to the phase angle between voltage and current, measuring electrical variables, measuring devices, etc., can solve the problem of inaccurate measurement of phase difference of alternating current signals, etc., to achieve clear physical concepts, anti-corrosion Effects of improved noise and increased computation load
Inactive Publication Date: 2014-02-12
NANJING UNIV OF POSTS & TELECOMM
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[0003] The technical problem to be solved by the present invention is to propose a method for digitally measuring the phase difference of alternating current in view of the inaccurate measurement accuracy of the phase difference of the alternating current signal in the prior art
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[0030] Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:
[0031] The essence of the present invention is to use digital integration and interpolation to process continuous digital sampling signals, and select a sampling point P after the signal exceeds the positive and negative peak values. 1 As the integration start point, there will be two consecutive points P in the subsequent sampling points i and P i+1 , if from P 1 to P i The numerical integral value of and from P 1 to P i+1 When the product of the digital integral value of is less than or equal to 0, it can be used in P i and P i+1 An integration end point k is obtained through interpolation, and the condition for obtaining k is from P 1 Digital integration up to k is 0. then it can be determined by P 1 The sampling occurrence time of k and the virtual occurrence time of k calculate the zero point of the electrical signal, and calculate th...
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The invention discloses a method for measuring the phase difference of alternating current in a digital mode. Continuous digital sampling signals are processed in a digital integration and interpolation mode, and zero points of electric signals are calculated according to an integration beginning point P1 and the visual generation time of an integration ending point k acquired in a difference mode; frequency or periods of the electric signals are calculated according to the zero crossing points of the electric signals; finally, the phase difference of acquired signals is calculated according to the zero crossing point time difference and periods of different signals. By means of the method for measuring the phase difference of the alternating current in the digital mode, it is not needed that low-frequency signals are converted into square waves, the defect that traditional zero crossing point detection is poor in interference resisting performance is overcome, phase difference measurement of low-frequency signals is particularly facilitated, system detection is convenient to carry out, hardware expenses are small, and interference resisting performance of a system is good; the method is easy and reasonable to achieve and has wide application prospect, and data are accurate and reliable.
Description
technical field [0001] The invention relates to a technique for digitally measuring the phase difference of alternating current, which can also be used for phase difference measurement of other low-frequency signals. Background technique [0002] In daily life and production process, it is often necessary to measure the phase difference of 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, so as to obtain the phase difference of the two signals, but this algorithm is easy to implement but Requires additional hardware and is susceptible to interference. Contents of the invention [0003] The technical problem to be solved by the present invention is to propose a method for digitally measuring the phase difference of the alternating c...
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Inventor 戴尔晗
Owner NANJING UNIV OF POSTS & TELECOMM