A Digital Method for Measuring the Instantaneous Phase of Alternating Current
An instantaneous phase, alternating current technology, applied in the phase angle between voltage and current, measuring electrical variables, measuring devices, etc., can solve the problem of inaccurate instantaneous phase measurement accuracy of alternating current, and achieve clear physical concepts and increased computational complexity. , the effect of improving anti-interference
Inactive Publication Date: 2016-02-03
NANJING UNIV OF POSTS & TELECOMM
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[0003] The technical problem to be solved by the present invention is that the measurement accuracy of the instantaneous phase of the alternating current in the prior art is not accurate enough, and a method for digitally measuring the instantaneous phase of the alternating current is proposed. Compared with the traditional zero-crossing method, the measurement accuracy, Inventions such as anti-interference have been greatly improved
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[0032] Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:
[0033] 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 1The sampling occurrence time of k and the virtual occurrence time of k calculate the zero point of the electrical signal, and calculate the...
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The invention discloses a method for digital measuring of the instantaneous phase of an alternating current. A digital integration and interpolation mode is used for processing continuous digital sampling signals, the virtual occurrence time of an integration start point P1 and the virtual occurrence time of an integration end point k which is acquired according to an interpolation mode are used for calculating the zero point of electrical signals, the frequency or the period of the electrical signals are calculated through the zero crossing point of a series of electrical signals, and at last the current instantaneous phase is calculated according to the time of the zero crossing point of the alternating current electrical signals in the previous time period, the period of predicted current cycle waves and the current time. The method is particularly suitable for measuring the instantaneous phase of the alternating current, system detecting is convenient, and hardware cost is low. Meanwhile, the method is simple and reasonable to achieve, the data are accurate and reliable, and great improvement is achieved on the aspects of measuring precision, anti-interference performance and the like.
Description
technical field [0001] The invention relates to a method for digitally measuring the instantaneous phase of alternating current, which is also suitable for the instantaneous phase measurement of low frequency signals. Background technique [0002] In daily life and production process, it is often necessary to measure the instantaneous phase of alternating current. The more accurate the measured instantaneous phase is, the better the application effect is. In the existing instantaneous phase measurement methods, most of them use the traditional zero-crossing method to measure the instantaneous phase of a certain signal. This algorithm is easy to implement, but it is easily affected by interference, which makes the measurement accuracy low. Contents of the invention [0003] The technical problem to be solved by the present invention is that the measurement accuracy of the instantaneous phase of the alternating current in the prior art is not accurate enough, and a method fo...
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IPC IPC(8): G01R25/00
Inventor 戴尔晗
Owner NANJING UNIV OF POSTS & TELECOMM