Power signal frequency detection method and system based on phase modulation

A power signal and phase modulation technology, applied in the power field, can solve the problems of poor anti-noise interference, low measurement accuracy, and low measurement accuracy of sinusoidal parameters.

Active Publication Date: 2017-09-26
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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Problems solved by technology

[0005] Based on this, it is necessary to provide a phase-based method for the problems that the above-mentioned frequency measurement method has low frequency measurement accuracy for low-frequency signals and poor anti-noise interference, which may easily lead to low measurement accuracy of sinusoidal parameters and poor anti-noise interference. Modulated power signal frequency detection method and system

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

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Embodiment Construction

[0045] 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.

[0046] 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.

[0047] see figure 1 , figure 1 It is a schematic flowchart of the first embodiment of the phase modulation-based power signal frequency detection method of the present invention.

[0048] The phase modulation-based power signal frequency detection method of this embodiment may include the following steps:

[0049] In step S101, the power signal is sampled according to a preset signal time length and a preset sampling frequency to obtain an input signal sequence.

[0050]...

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Abstract

The invention discloses a method and system for detecting the frequency of a power signal based on phase modulation. The method includes: sampling the power signal according to a preset signal time length and a preset sampling frequency to obtain an input signal sequence; measuring the input The frequency of the signal sequence is used to obtain the preliminary frequency of the power signal, and the input signal sequence is subtracted from the ±1π phase shift sequence of the input signal sequence with the preliminary frequency as a reference frequency to obtain the phase change with the frequency of the input signal Two phase modulation sequences; by performing frequency mixing, filtering and integration on the two phase modulation sequences respectively, and then obtaining the phases of the two phase modulation sequences, and performing frequency measurement. By implementing the present invention, frequency measurement results with higher precision can be obtained.

Description

【Technical field】 [0001] The invention relates to the field of electric power technology, in particular to a phase modulation-based power signal frequency detection method and system. 【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 neural network, frequen...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R23/02
Inventor 李军王越超
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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