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Method for calculating multi-frequency AC signal

A technology of AC signal and frequency, applied in frequency measurement device, frequency to amplitude conversion, phase angle between voltage and current, etc., can solve problems such as increasing CPU burden and unfavorable expansion

Active Publication Date: 2015-05-06
NARI TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If equal-angle sampling is ensured by adjusting the sampling interval, it is necessary to set multiple sampling interrupts according to the number of frequencies to track the frequency separately, which increases the burden on the CPU on the one hand, and is not conducive to expansion on the other hand.

Method used

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  • Method for calculating multi-frequency AC signal
  • Method for calculating multi-frequency AC signal
  • Method for calculating multi-frequency AC signal

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Embodiment Construction

[0030] The invention provides a method applicable to the calculation of multiple frequency AC signals. The method obtains the sampling sequence of each signal based on the fixed interval of the power frequency, performs Fourier calculation on the sampling sequence of each signal respectively, and calculates the imaginary part sequence by Complete the frequency measurement to get the true frequency of each signal. Then adjust the frequency and phasor based on the power frequency, and finally get the amplitude and phase of each signal at the real frequency.

[0031] In order to further describe the technical features and effects of the present invention, the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0032] refer to figure 1 , a method applicable to the calculation of multiple frequency AC signals, comprising the following steps:

[0033] Step 1. Set the signal model, and set p frequencies in the ...

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Abstract

The invention discloses a method for calculating a multi-frequency AC signal. The method comprises the steps of sampling N points at each cycle of wave according to the power frequency; calculating the real part and an imaginary part for fourier algorithm through discretion fourier transformation; calculating the frequency according to the intervals of position zero crossing points of the imaginary part; calculating each coefficient value through the frequency; adjusting the amplitude and phase of each signal, calculated based on the power frequency to obtain real phasor. Compared with the other methods, the method has the advantage that extra filtering link is saved, frequency tracking is avoided, the signals at a plurality of frequencies can be measured, and therefore, three elements (frequency, amplitude and angle) of the phasor can be completely measured.

Description

technical field [0001] The invention belongs to the field of electrotechnical technology, and in particular relates to a method suitable for calculating multiple-frequency AC signals. Background technique [0002] Fourier algorithm is widely used in power system phasor calculation. When the sampling frequency is an integer multiple of the actual frequency of the signal, the result of the Fourier calculation is completely accurate due to the absence of spectrum leakage and fence effects; if the sampling frequency is not an integer multiple of the signal frequency, the calculation result of the Fourier algorithm There will be errors. Frequency tracking technology has become an essential and important part of modern microcomputer protection and automation devices. The frequency tracking method, which calculates the phasor frequency and then adjusts the sampling interval according to the frequency to ensure the accuracy of phasor calculation, is widely used in power system pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R23/02G01R23/06G01R25/00
Inventor 岳蔚陆源蔡晓峰张兆云
Owner NARI TECH CO LTD
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