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Method and system for obtaining a reduced frequency reference quadrature sequence of a power signal

A power signal and power acquisition technology, applied in the power field, can solve problems such as low measurement accuracy and unsuitable for high-accuracy sinusoidal parameters

Active Publication Date: 2018-01-30
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 reduced frequency reference quadrature sequence of a power signal
  • Method and system for obtaining a reduced frequency reference quadrature sequence of a power signal

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[0051] 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.

[0052] 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.

[0053] In one embodiment, a method for obtaining a reduced frequency reference quadrature sequence of a power signal, such as figure 1 shown, including the following steps:

[0054] 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;

[0055] Step S102: Sampling the power signal according to the preliminary seq...

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Abstract

The invention discloses a method and a system for acquiring a reduced-frequency reference orthogonal sequence of an electric signal. The method comprises steps that preliminary sequence length and a preliminary sequence of the electric signal are acquired; first frequency test on the preliminary sequence is carried out, and a reference frequency is set; unit period sequence length and preset sequence length of the electric signal are acquired, and first time forward / inverted sequences are acquired further; a first time average initial phase is acquired according to the first time forward / inverted sequences; second time forward / inverted sequences and second time average initial phase are acquired according to first time phase comparison values of the first time average initial phase and + / -(phi / 4) and a new initial point; zero initial phase reference cosine / sine function modulation sequences are acquired according to the second time forward / inverted sequences and the second time average initial phase, first / second / third / fourth multiplication sequences are acquired further, and the reduced-frequency reference orthogonal sequence is acquired according to the first / second / third / fourth multiplication sequences. Through the method, sine parameter calculation accuracy is improved, and the method is suitable for application.

Description

technical field [0001] The present invention relates to the field of electric power technology, in particular to a method and system for obtaining a reduced frequency reference orthogonal 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 spe...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R23/02
CPCG01R23/02
Inventor 叶向前李军王越超朱亚清
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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