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Method and system for obtaining reduced frequency zero initial phase reference cosine function sequence

A technology of cosine function and zero initial phase, which is applied in the field of obtaining the zero initial phase reference cosine function sequence with reduced frequency, which can solve the problems of low measurement accuracy and unsuitability for high-accuracy sine parameters, etc.

Active Publication Date: 2016-05-04
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 reduced frequency zero initial phase reference cosine function sequence
  • Method and system for obtaining reduced frequency zero initial phase reference cosine function sequence
  • Method and system for obtaining reduced frequency zero initial phase reference cosine function sequence

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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, the method for obtaining the zero initial phase reference cosine function sequence of reduced frequency, 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 pr...

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Abstract

The invention discloses a method and system for obtaining a reduced frequency zero initial phase reference cosine function sequence. 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 period sequence length and a preset sequence length, and further obtaining an initial forward / inverse sequence; obtaining an initial average initial phase according to the initial forward / inverse sequence; obtaining a secondary forward / inverse sequence and a 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 obtaining a zero initial phase reference cosine / sine function modulation sequence according to the secondary forward / inverse sequence and the secondary average initial phase, further obtaining a third / fourth multiplication sequence, and finally obtaining a reduced frequency zero initial phase reference cosine function sequence according to the 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 zero-initial phase reference cosine function sequence with reduced frequency. 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...

Claims

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Application Information

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IPC IPC(8): G01R23/167
CPCG01R23/167
Inventor 吴乐李军万文军王越超
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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