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Method and system for harmonic phase measurement of power signal

A power signal and phase measurement technology, applied in the electric power field, can solve the problems of poor anti-noise interference, low frequency signal measurement accuracy, low harmonic phase measurement accuracy, etc.

Active Publication Date: 2017-06-30
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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Problems solved by technology

[0006] However, the rated power frequency of power grid operation is 50Hz, which is a relatively low frequency. The above-mentioned frequency measurement method has low frequency measurement accuracy for low-frequency signals and poor anti-noise interference, which may easily lead to low measurement accuracy of harmonic phase and low Noise interference is poor

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  • Method and system for harmonic phase measurement of power signal

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Embodiment Construction

[0058] 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.

[0059] 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.

[0060] seefigure 1 , figure 1 It is a schematic flow chart of the harmonic phase measurement method of the electric power signal in the present invention.

[0061] The harmonic phase measurement method of the power signal in this embodiment may include the following steps:

[0062] Step S101 , according to a preset time length and a preset sampling frequency, the power signal is sampled to obtain a sampled data sequence.

[0063] In step S102, a preliminary measurement of...

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Abstract

The invention discloses a harmonic phase method and system of electric power signals. The method comprises: generating an imaginary vector filter sequence and a real vector filter sequence by digitally filtering the imaginary vector sequence and the real vector sequence, respectively converting the real vector filter sequence to and the imaginary vector filter sequence are divided into two sequences, generating the real vector filter front sequence, the real vector filter rear sequence, the imaginary vector filter front sequence and the imaginary vector filter rear sequence; sequentially filter the front sequence and the imaginary vector filter front sequence , and the post-filter sequence of the real number vector and the post-filter sequence of the imaginary vector to perform integration, calculation of phase and phase difference; converting the phase difference and the reference frequency into the fundamental frequency of the power signal. Harmonic phase measurement is performed with the product of the fundamental frequency and the harmonic factor as the reference frequency. By implementing the invention, the frequency mixing interference components in the imaginary number vector sequence and the real number vector sequence can be suppressed to generate high-precision harmonic phase.

Description

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

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R25/00G06F19/00
Inventor 李军
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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