An Accurate Method for Measuring the Instantaneous Phase of Alternating Current

Abstract

The invention discloses a method for accurately measuring an instantaneous phase of an alternating current. The method comprises the steps that an integrator is firstly initialized so that output voltage of the integrator can return to zero, an appropriate moment is selected for integration simulation after an electric signal exceeds a negative peak, the integration start time is recorded, integration is stopped when the output voltage of the integrator returns to zero again, the integration finish time is recorded, zero crossing points of the electric signal are calculated according to the integration start time and the integration finish time, and a period of the electric signal is calculated according to the zero crossing points of the electric signal; finally, according to the times of the zero crossing points of the alternating current signal at the last time frame, the predicated period of a current cycle and the current time, the current instantaneous phase is calculated. According to the method for accurately measuring the instantaneous phase of the alternating current, the alternating current does not need to be converted into square waves, the defect that the anti-jamming capacity is poor is overcome, the method is particularly suitable for measurement of the alternating current, system detection is convenient, hardware expense is small, and the method is simple and reasonable in achievement, accurate and reliable in data and great in improvement of the measuring accuracy, the anti-jamming capacity and the like.

Description

technical field [0001] The invention relates to a precise measurement method of the instantaneous phase of alternating current, which is also suitable for the measurement of the instantaneous phase of low-frequency sinusoidal 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...

AI Technical Summary

Problems solved by technology

[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 precise measurement method of 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

Images