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Adaptive software and hardware frequency tracking and sampling method

A frequency tracking, software and hardware technology, applied in the field of distribution network, can solve the problems of measurement value deviation and inability to adjust flexibly, and achieve the effect of reducing error, improving accuracy, and improving calculation accuracy

Inactive Publication Date: 2013-11-06
ZHUHAI XUJIZHI ELECTRIFIED WIRE NETING AUTOMATIONCO +2
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AI Technical Summary

Problems solved by technology

When using the software frequency measurement method, if the signal is disturbed at the zero crossing point, the measured value will have a large deviation, while the hardware frequency measurement method cannot be adjusted flexibly when the signal amplitude is small or the hardware circuit is wrong.

Method used

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  • Adaptive software and hardware frequency tracking and sampling method
  • Adaptive software and hardware frequency tracking and sampling method
  • Adaptive software and hardware frequency tracking and sampling method

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Embodiment Construction

[0026] refer to figure 1 As shown in the flow chart of the method of the present invention, after the signal to be tested is processed, the hardware frequency measurement circuit and software frequency measurement are used to measure the frequency of the signal to be tested, and the sampling timer adjusts the sampling period in real time according to the frequency measurement value. The specific process includes the following step:

[0027] (1) When the power distribution terminal is powered on, the sampling period of the sampling timer is set to 50HZ as the initial value, and at the same time, the hardware frequency measurement circuit and software frequency measurement function perform signal frequency measurement on the signal to be tested;

[0028] (2) Carry out frequency tracking, collect frequency measurement value f1 of hardware frequency measurement circuit, frequency measurement value f2 of software frequency measurement and signal amplitude V;

[0029] (3) If V is g...

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Abstract

The invention discloses an adaptive software and hardware frequency tracking and sampling method. By means of software and hardware combination, the frequency of signals to be measured is measured, frequency measuring flexibility is improved, low frequency measuring precision caused by a single frequency measuring mode is avoided when the amplitude of the signals to be measured is changed, a sampling period is adjusted in real time according to frequency measuring results by a sampling timer, and low frequency measuring precision caused by sample incompleteness in the sampling period is also avoided. By practical frequency measuring application, the frequency measuring precision reaches 0.001Hz, practical application requirements are met, and the measuring precision is substantially improved.

Description

technical field [0001] The invention relates to the technical field of distribution networks, in particular to a method for adaptive software and hardware frequency tracking and acquisition. Background technique [0002] The root mean square algorithm or Fourier transform is widely used in the calculation of the numerical value and harmonic analysis of alternating current. If the sampling period is fixed when the frequency of the power grid changes, it will lead to incomplete sample data and calculation errors. For the root mean square algorithm, the error can be reduced by increasing the number of samples, which will reduce the real-time performance of the calculation. For the Fourier transform, the error caused by incomplete sample data cannot be compensated by increasing the number of samples. And timely adjustment of the sampling period according to the change of the grid frequency can ensure complete sample data and improve calculation accuracy. [0003] The existing ...

Claims

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Application Information

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IPC IPC(8): G01R23/02
Inventor 秦卫东詹植振丁子良
Owner ZHUHAI XUJIZHI ELECTRIFIED WIRE NETING AUTOMATIONCO
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