Software frequency measuring method implemented based on three-phase voltage
A three-phase voltage and software technology, applied in the direction of measuring current/voltage, measuring devices, measuring electrical variables, etc., can solve the problem of low measurement accuracy, achieve strong operability, improve accuracy, and compensate for time delay and limitations Effect
Pending Publication Date: 2020-06-09
南京保合太和电力科技有限公司
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Problems solved by technology
[0004] Aiming at the deficiencies of the prior art, the present invention provides a software frequency measurement method based on three-phase voltage, which has the advantage of improving measurement accuracy and solves the current problem of low measurement accuracy
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[0025] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Apparently, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0026] A software frequency measurement method realized based on three-phase voltage, comprising the following steps:
[0027] S1: Obtain the original sampling data, take the AD value of the equipment voltage, and judge whether it crosses zero; the details are:
[0028] The voltage AD value crosses zero, the angle is cleared, and the virtual curve value is calculated according to the angle;
[0029] If the voltage AD value does not cross zero, whether the interrupt is coming...
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The invention relates to the technical field of software frequency measuring, and discloses a software frequency measuring method implemented based on three-phase voltage, and the method comprises thefollowing steps: S1, acquiring original sampling data, using an equipment voltage AD value, and judging whether the equipment voltage AD value crosses zero or not, to be more specific, if the voltageAD value crosses zero, an angle is reset, and a virtual curve value is calculated according to the angle, if the voltage AD value is not zero-crossing, performing interrupting whether or not, to be more specific, if not, repeating interrupting whether or not, and if yes, the angle = length angle + step length; and calculating a virtual curve value according to the angle; S2, judging whether the virtual curve value is before and after zero crossing, specifically, if yes, the equipment voltage is normal; if not, the relationship between the error value and 20% of virtual voltage absolute valueis judged, specifically, if the error value is smaller than 20% of the virtual voltage absolute value, the power grid drops; and if the error value is greater than 20% of the virtual voltage absolutevalue, the power grid rises. The software frequency measuring method based on the three-phase voltage can solve the problem of low measuring precision at present.
Description
technical field [0001] The invention relates to the technical field of software frequency measurement, in particular to a software frequency measurement method based on three-phase voltage. Background technique [0002] With the development of our country's society, the proportion of the electric power field in the society has become heavier. The quality of the power grid will directly affect the working status of the electrical equipment. Therefore, it is necessary to regularly detect the power grid through software. For the current traditional software frequency measurement, a single interpolation algorithm is often used to determine the zero-crossing point, and then calculate the signal period and frequency. Because the quadratic function is simply used to simulate the sine function in the frequency measurement process, the curve fitting degree is poor in the zero-crossing point area. , the measurement accuracy is not high, and the absolute error is difficult to reach the...
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IPC IPC(8): G01R19/25
CPCG01R19/2503G01R19/2506
Inventor 柯德渠王媛许小军王磊王海涛
Owner 南京保合太和电力科技有限公司