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Method and system for obtaining a sequence of increased frequency cosine functions of a power signal

A technology of power signal and cosine function, which is applied in the field of power, can solve problems such as low measurement accuracy and unsuitability for high-accuracy sine parameters, and achieve the effect of improving accuracy

Active Publication Date: 2018-05-04
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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Problems solved by technology

However, the above measurement method has low measurement accuracy and is not suitable for the measurement of high-accuracy sinusoidal parameters.

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  • Method and system for obtaining a sequence of increased frequency cosine functions of a power signal
  • Method and system for obtaining a sequence of increased frequency cosine functions of a power signal
  • Method and system for obtaining a sequence of increased frequency cosine functions of a power signal

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Embodiment Construction

[0046] 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.

[0047] 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.

[0048] In one embodiment, the method for obtaining the frequency cosine function sequence of the power signal, such as figure 1 shown, including the following steps:

[0049] 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;

[0050] Step S102: Sampling the power signal according to the preliminary sequence l...

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Abstract

The invention discloses a method and system for obtaining a raised-frequency cosine function sequence of electric power signals. The method comprises the following steps: a preliminary sequence length and a preliminary sequence of electric power signals are obtained; frequency preliminary testing is carried out on the preliminary sequence to set a reference frequency; a unit cycle sequence length and the preset sequence length of the electric power signals are obtained; a first-time forward / reverse-folded sequence is further obtained; a first-time average initial phase is obtained according to the initial forward / reverse-folded sequence; according to a first-time phase comparison value between the first-time average initial phase and +-Pi / 4 and a new start point, a second-time forward / reverse-folded sequence and a second-time average initial phase are obtained; according to the second-time forward / reverse-folded sequence and the second-time average initial phase, a zero initial phase standard cosine / sine function modulation sequence is obtained; a third / fourth multiplicative sequence is further obtained according to a preset fine tuning frequency and the cosine / sine function modulation sequence; and finally according to the third / fourth multiplicative sequence, the cosine function sequence with a raised-frequency is obtained. The method and system of the invention can raise the accuracy degree of sine parameter calculating, and is suitable for application.

Description

technical field [0001] The invention relates to the field of electric power technology, in particular to a method and system for obtaining a frequency-increased cosine function sequence 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. Fast Fourier transform and discrete Fourier transform are the basic methods to realize the measurement of sinusoidal parameters, and are widely used in power systems. However, the above method truncates the non-integer period of the signal sampling process, causing spectrum leakage, and the spectrum leakage will generate corresponding errors. [0003] In the measurement of the sinusoidal parameters of the power system, there are many measurement methods, such as adding a window function method, using an interpolation correction method, etc., to reduce the influence of the spectrum leaka...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R23/16
CPCG01R23/16
Inventor 潘凤萍李军罗嘉
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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