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Method and system for measuring sinusoidal parameters of electric power signals

A power signal and parameter measurement technology, applied in the field of electric power, can solve the problems of low measurement accuracy of sinusoidal parameters, poor anti-noise interference, and low measurement accuracy.

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

[0008] Based on this, it is necessary to provide a power signal for the above-mentioned frequency measurement method to the low-frequency signal frequency measurement accuracy is not high, and the anti-noise interference is poor, which easily leads to low measurement accuracy of sinusoidal parameters and poor anti-noise interference. Method and system for measuring sinusoidal parameters

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  • Method and system for measuring sinusoidal parameters of electric power signals
  • Method and system for measuring sinusoidal parameters of electric power signals
  • Method and system for measuring sinusoidal parameters of electric power signals

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[0036] 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.

[0037] 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.

[0038] see figure 1 , figure 1 It is a schematic flow chart of the method for measuring sinusoidal parameters of electric power signals in the present invention.

[0039] The method for measuring sinusoidal parameters of the power signal in this embodiment may include the following steps:

[0040] Step S101 , according to a preset time length and a preset sampling frequency, the power signal is sampled to generate a sampled data sequence.

[0041] In step S102, a prelimi...

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Abstract

The invention discloses a sinusoidal parameter measurement method and system of a power signal. The method comprises the following steps: performing preliminary measurement on fundamental wave frequency of a sampling data sequence to acquire preliminary fundamental wave frequency and multiplying a cosine function and a sine function of the preliminary fundamental wave frequency serving as the reference frequency by the sampling data sequence respectively to generate a real vector sequence and an imaginary vector sequence; performing digital filtering on the real vector sequence and the imaginary vector sequence to generate a real vector filter sequence and an imaginary vector filter sequence, and further integrating to generate a real vector integral value and an imaginary vector integral value; converting the real vector integral value and the imaginary vector integral value into corresponding sinusoidal parameters according to a preset sinusoidal parameter conversion rule. By implementing the method and the system, mixed frequency interference elements in the real vector sequence and the imaginary vector sequence can be inhibited to generate high-precision real vector and imaginary vector sequence integral values so as to finally obtain the sinusoidal parameters with higher precision.

Description

[0001] 【Technical field】 [0002] The invention relates to the field of electric power technology, in particular to a method and system for measuring sinusoidal parameters 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. It c...

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Application Information

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