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 problems such as poor anti-noise interference, low measurement accuracy of sinusoidal parameters, and low measurement accuracy

Active Publication Date: 2015-05-20
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

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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 power signal frequency detection method and a power signal frequency detection system based on phase modulation. The method comprises the steps: sampling a power signal according to preset signal time span and preset sampling frequency, so as to obtain an input signal sequence; measuring the frequency of the input signal sequence, so as to obtain the initial frequency of the power signal, and subtracting the input signal sequence and the plus or minus 1 Pi phase-shift sequence of the input signal sequence by using the initial frequency as reference frequency, so as to obtain two phase modulation sequences of which phases change along with the input signal frequency; respectively mixing, filtering and integrating the two phase modulation sequences, so as to obtain the phases of the two phase modulation phases for frequency measurement. By implementing the power signal frequency detection method and the power signal frequency detection system, frequency measurement results with higher accuracy 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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IPC IPC(8): G01R23/02
Inventor 李军王越超
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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