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Method and system for orthogonal modulation of power signals

A power signal, quadrature modulation technology, applied in the power field, can solve the problems of poor anti-harmonic and noise interference, low measurement accuracy of sinusoidal parameters, etc., to achieve the effect of improving accuracy and anti-harmonic

Active Publication Date: 2015-11-18
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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Problems solved by technology

Due to the limitations of actual signal processing technology and the complexity of signal composition, the above measurement methods have low measurement accuracy for sinusoidal parameters and poor anti-harmonic and noise interference

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  • Method and system for orthogonal modulation of power signals
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  • Method and system for orthogonal modulation of power signals

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Embodiment Construction

[0048] 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.

[0049] 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.

[0050] A method for quadrature modulation of power signals in one embodiment, such as figure 1 shown, including the following steps:

[0051] Step S101: Obtain the preliminary sequence length of the power signal according to the lower limit of the frequency range of the power signal, the preset sampling frequency and the preset integer signal cycle number;

[0052] Step S102: Perform preliminary sampling on the power signal according to the preliminary sequence length to obt...

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Abstract

The invention discloses a method and a system for orthogonal modulation of power signals. The method comprises the following steps: acquiring an initial sequence length and an initial sequence according to a frequency lower limit, a preset sampling frequency and an initially set integer signal cycle number of a power signal; acquiring a reference frequency according to the initial sequence, and further acquiring a unit cycle sequence length and a preset sequence length; acquiring first forward and reverse sequences according to a preset sequence starting point and the preset sequence length; generating first real-frequency and imaginary-frequency vector sequences and second real-frequency and imaginary-frequency vector sequences according to the first forward and reverse sequences; converting obtained first and second phases into a first forward sequence average initial phase; obtaining a new preset sequence starting point according to the average initial phase; and obtaining a cosine function modulation sequence and a sine function modulation sequence according to second forward and reverse sequences obtained from the initial sequence. By adopting the method and the system of the invention, an orthogonal modulation sequence with consistent amplitude height can be obtained, and the accuracy and anti-jamming performance of sinusoidal parameter calculation are improved.

Description

technical field [0001] The invention relates to the field of electric power technology, in particular to a method and system for quadrature modulation of electric power signals. Background technique [0002] The frequency measurement, phase measurement, amplitude measurement, etc. of the power system are all measurements of sinusoidal parameters 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 parameter measurement technology, the problems of Fourier transform become more and more prominent, and it is difficult to further meet the requirements of high-accuracy calculation of sinusoidal parameters in power systems. [0003] In the measurement of sinusoidal parameters in power systems, there are many measurement methods, such as zero-crossing method, filter-based measurement method, wavelet transform-based method, neural network-based measur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R23/02G01R25/00G01R19/00
Inventor 李军任娟娟欧阳春明陈华忠湖康涛
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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