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Method and system for obtaining a fine-tuned frequency reference sequence from a power signal

A technology of power signal and reference sequence, applied in the field of power, can solve problems such as low measurement accuracy and unsuitability for high-accuracy sinusoidal parameters, and achieve the effect of improving accuracy

Active Publication Date: 2018-04-06
广州粤能电力科技开发有限公司
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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 fine-tuned frequency reference sequence from a power signal
  • Method and system for obtaining a fine-tuned frequency reference sequence from a power signal

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Embodiment Construction

[0049] 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.

[0050] 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.

[0051] In one embodiment, a method for obtaining a fine-tuned frequency reference sequence from a power signal, such as figure 1 shown, including the following steps:

[0052] 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;

[0053] Step S102: Sampling the power signal according to the preliminary sequence ...

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Abstract

The invention discloses a method and system for obtaining a fine tuning frequency reference sequence from an electric power signal. The method includes the steps of: obtaining an electric power signal preliminary sequence length and a preliminary sequence; performing preliminary frequency measurement on the preliminary sequence, and setting reference frequency; obtaining an electric power signal unit periodic sequence length and a preset sequence length, and further obtaining an initial forward / inverse sequence; obtaining a primary average initial phase according to the initial forward / inverse sequence; obtaining a secondary forward / inverse sequence and secondary average initial phase according to an initial phase comparison value of the initial average initial phase and + / -pi / 4 and a new initial point; and according to the secondary forward / inverse sequence and the secondary average initial phase, obtaining a zero initial phase reference cosine / sine function modulation sequence, further obtaining a first / second / third / fourth multiplication sequence, and finally obtaining a fine tuning frequency reference sequence according to the first / second / third / fourth multiplication sequence. The method provided by the invention improves the degree of accuracy of sine parameter calculation, 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 fine-tuning frequency reference sequence from 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 leakage...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R23/167
CPCG01R23/167
Inventor 郑少鹏舒探宇苏建强雷增强
Owner 广州粤能电力科技开发有限公司
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