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Method and system for measuring fundamental frequency of power signal

A fundamental frequency and power signal technology, applied in the power field, can solve problems such as low precision and poor anti-noise interference

Active Publication Date: 2017-05-10
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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  • Abstract
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Problems solved by technology

[0008] Based on this, it is necessary to provide a method and system for measuring the fundamental frequency of power signals in view of the problems that the above-mentioned frequency measurement method has low frequency measurement accuracy for low-frequency signals and poor anti-noise interference

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  • Method and system for measuring fundamental frequency of power signal
  • Method and system for measuring fundamental frequency of power signal

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Embodiment Construction

[0043] 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.

[0044] 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.

[0045] see figure 1 , figure 1 It is a schematic flow chart of the method for measuring the fundamental frequency of a power signal in the present invention.

[0046] The method for measuring the fundamental frequency of the power signal in this embodiment may include the following steps:

[0047] Step S101 , according to a preset time length and a preset sampling frequency, the power signal is sampled to obtain a sampled data sequence.

[0048] In step S102, a prelimina...

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Abstract

The invention discloses an electric signal fundamental frequency measuring method and system. The method comprises the steps that an imaginary number vector filter sequence and a real number vector filter sequence are generated by carrying out digital filtering on an imaginary number vector sequence and a real number vector sequence, and the imaginary number vector filter sequence and the real number vector filter sequence are each equally divided into two sections to form a real number vector filter front section sequence, a real number vector filter rear section sequence, a virtual number vector filter front section sequence and a virtual number vector filter rear section sequence; integration, phase position solving and phase difference solving are carried out on the real number vector filter front section sequence, the real number vector filter rear section sequence, the virtual number vector filter front section sequence and the virtual number vector filter rear section sequence in sequence; the phase difference and the reference frequency are converted into the fundamental frequency of an electric signal. By the adoption of the electric signal fundamental frequency measuring method and system, mixed frequency interference elements in the virtual number vector sequence and the real number vector sequence can be restrained, and the high-precision fundamental frequency is generated.

Description

[0001] 【Technical field】 [0002] The invention relates to the field of electric power technology, in particular to a method and system for measuring the fundamental frequency of electric power signals. [0003] 【Background technique】 [0004] The frequency measurement, harmonic measurement, power measurement, etc. of the power system are all sinusoidal parameter measurements 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 measurement technology, the problems of Fourier transform become more and more prominent, and it is difficult to further meet the requirements of high-precision calculation of sinusoidal parameters. [0005] The calculation of power system power is firstly the calculation of voltage and current amplitude and phase, and the calculation of voltage and current amplitude and phase is first of all the calculation of frequency. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R23/02G01R23/16
Inventor 李军
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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