Power signal frequency detection method and system based on amplitude modulation

A power signal and amplitude modulation technology, applied in the field of electric power, can solve the problems of poor anti-noise interference, inability to perform continuous frequency measurement, low measurement accuracy, etc. Effect

Active Publication Date: 2015-05-20
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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Problems solved by technology

[0006] Based on this, it is necessary to address the low-frequency measurement accuracy of low-frequency signals by the above-mentioned frequency measurement method, and poor anti-noise interference, which may easily lead to low measureme

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  • Power signal frequency detection method and system based on amplitude modulation
  • Power signal frequency detection method and system based on amplitude modulation
  • Power signal frequency detection method and system based on amplitude modulation

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Embodiment Construction

[0043] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0044] Although the steps in the present invention are arranged with labels, they are not used to limit the order of the steps. Unless the order of the steps is clearly stated or the execution of a certain step requires other steps as a basis, the relative order of the steps can be adjusted.

[0045] see figure 1 , figure 1 It is a schematic flowchart of the first embodiment of the amplitude modulation-based power signal frequency detection method of the present invention.

[0046] The method for detecting the frequency of a power signal based on amplitude modulation in this embodiment may include the following steps:

[0047] In step S101, the power signal is sampled according to a preset signal time length and a preset sampling frequency to obtain an input si...

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Abstract

The invention discloses a power signal frequency detection method and system based on amplitude modulation. The method comprises the following steps: sampling a power signal according to a preset signal time length and a preset sampling frequency to obtain an input signal sequence; measuring the frequency of the input signal sequence to obtain the initial frequency of the power signal, and subtracting a pi/2 phase-shift sequence of the input signal sequence from the input signal sequence by taking the initial frequency as a reference frequency to obtain two amplitude modulation sequences of which the amplitude vary along with the input signal frequency; performing frequency mixing, filtering and integration on the two amplitude modulation sequences respectively to obtain the amplitudes of the two amplitude modulation sequences, and performing frequency measurement. By implementing the power signal frequency detection method and system, a high-accuracy frequency measurement result can be obtained.

Description

【Technical field】 [0001] The invention relates to the field of electric power technology, in particular to a method and system for detecting frequency of electric power signals based on amplitude modulation. 【Background technique】 [0002] The frequency measurement, harmonic measurement, power measurement, etc. of the power system are all sinusoidal parameter measurements in essence. Fourier transform is the basic method to realize the measurement of sinusoidal parameters, and it is widely used in power system. However, with the development of sinusoidal measurement technology, the problems of Fourier transform become more and more prominent, and it is difficult to further meet the requirements of high-precision calculation of sinusoidal parameters. [0003] In power system frequency measurement, there are various frequency measurement or calculation methods, such as zero-crossing method, algorithm based on filtering, algorithm based on wavelet transform, algorithm based on...

Claims

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Application Information

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IPC IPC(8): G01R23/02
Inventor 李军王越超
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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