Harmonic amplitude measurement method and system of power signal

A technology of power signal and harmonic amplitude, applied in the field of electric power, can solve problems such as poor anti-noise interference, low measurement accuracy of harmonic amplitude, and low measurement accuracy

Active Publication Date: 2015-04-08
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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Problems solved by technology

[0005] Based on this, it is necessary to provide a method to solve the problems that the above-mentioned frequency measurement method has low frequency measurement accuracy for low-frequency signals, and has poor anti-noise interference, which may easily lead to low measurement accuracy of harmonic amplitude and poor anti-noise interference. Method and system for measuring harmonic amplitude of power signal

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  • Harmonic amplitude measurement method and system of power signal
  • Harmonic amplitude measurement method and system of power signal
  • Harmonic amplitude measurement method and system of power signal

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Embodiment Construction

[0053] 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.

[0054] 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.

[0055] see figure 1 , figure 1 It is a schematic flow chart of the method for measuring the harmonic amplitude of the electric power signal in the present invention.

[0056] The method for measuring the harmonic amplitude of the power signal in this embodiment may include the following steps:

[0057] Step S101 , according to a preset time length and a preset sampling frequency, the power signal is sampled to obtain a sampled data sequence.

[0058] In step S102, a prelim...

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Abstract

The invention discloses a harmonic amplitude measurement method and system of a power signal. The method comprises the following steps: performing digital filtering on an imaginary vector sequence and a real vector sequence to generate an imaginary vector filter sequence and a real vector filter sequence; equally dividing the real vector filter sequence and the imaginary vector filter sequence into two sections of sequences to generate a real vector filter front-section sequence, a real vector filter rear-section sequence, an imaginary vector filter front-section sequence and an imaginary vector filter rear-section sequence respectively; integrating the real vector filter front-section sequence, the imaginary vector filter front-section sequence, the real vector filter rear-section sequence and the imaginary vector filter rear-section sequence in sequence to solve phase and phase difference; converting the phase difference and reference frequency into fundamental wave frequency of the power signal. The product of the fundamental wave frequency and a harmonic factor is used as the reference frequency to perform harmonic wave amplitude measurement. By implementing the method and the system, mixed frequency interference elements in the imaginary vector sequences and the real vector sequences can be inhibited to generate the harmonic wave amplitude with high precision.

Description

【Technical field】 [0001] The invention relates to the field of electric power technology, in particular to a method and system for measuring harmonic amplitude of electric power signals. 【Background technique】 [0002] 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. [0003] 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 can be considered t...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R23/167
Inventor 李军
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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