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Frequency measurement method and system based on zero initial phase reference sine function sequence

A sine function and zero initial phase technology, which is applied in the field of frequency measurement based on the zero initial phase reference sine function sequence, can solve the problems of low frequency and low measurement accuracy, and achieve the effect of improving accuracy

Active Publication Date: 2018-06-01
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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Problems solved by technology

Since the rated power frequency of the power grid is around 50Hz (Hertz), it is a low-frequency sinusoidal frequency, and there is interference in the actual power signal, such as harmonic interference, similar white noise interference generated by random fluctuations in a small range of power load, etc. , in the interference environment, the common problem of these algorithms is that the measurement accuracy is not high

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  • Frequency measurement method and system based on zero initial phase reference sine function sequence
  • Frequency measurement method and system based on zero initial phase reference sine function sequence
  • Frequency measurement method and system based on zero initial phase reference sine function sequence

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Embodiment Construction

[0056] In order to further illustrate the technical means adopted by the present invention and the achieved effects, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings and preferred embodiments.

[0057] Such as figure 1 As shown, a method for frequency measurement based on the zero-initial phase reference sine function sequence includes steps:

[0058] S101. Obtain a preliminary sequence length according to the lower limit of the power signal frequency range, the preset sampling frequency and the preset integer signal cycle number;

[0059] S102. Sampling the power signal according to the preliminary sequence length to obtain a preliminary sequence of the power signal;

[0060] S103. Preliminarily measure the frequency of the preliminary sequence to obtain a preliminary frequency of the power signal, and obtain a reference frequency according to the preliminary frequency;

[0061] S10...

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Abstract

The invention relates to a method and system for performing frequency measurement according to a zero initial phase reference sine function sequence. The method includes the steps of: obtaining a real frequency mixing sequence and an imaginary frequency mixing sequence, then performing digital filtering and integration on the real frequency mixing sequence and the imaginary frequency mixing sequence, obtaining a real frequency integral value and an imaginary frequency integral value, obtaining the phase of a zero initial phase reference sine function modulation sequence according to the real frequency integral value and the imaginary frequency integral value, and obtaining the frequency of an electric power signal according to the phase. Obtaining the frequency of the electric power signal through the method provided by the invention can remarkably improve the degree of accuracy of frequency measurement of the electric power signal.

Description

technical field [0001] The invention relates to the technical field of power systems, in particular to a frequency measurement method and system based on a zero initial phase reference sinusoidal function sequence. 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 terms of sinusoidal parameter measurement of power system, there are some improved parameter measurement methods, such as zero-crossing method, filter-based measurement method, wav...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R23/02
CPCG01R23/02
Inventor 李军万文军王越超
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID