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Sine wave parameter measuring method and system in electric power system

A power system and parameter measurement technology, applied in the power field, can solve the problem of low frequency value accuracy

Active Publication Date: 2015-02-04
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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Problems solved by technology

[0004] Based on this, it is necessary to provide a parameter measurement method and system for a sine wave signal in a power system to solve the problem of low accuracy of the frequency value measured by measuring the frequency of the low-frequency signal.

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  • Sine wave parameter measuring method and system in electric power system
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  • Sine wave parameter measuring method and system in electric power system

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[0023] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0024] see figure 1 , figure 1 It is a schematic flow chart of the first embodiment of the parameter measurement method of the sine wave signal in the power system of the present invention.

[0025] The parameter measurement method of the sine wave signal in the described power system of this embodiment may include the following steps:

[0026] Step S101 , according to the preset signal time length and the preset signal discrete sampling frequency, the sine wave signal is sampled to obtain a sampled data sequence.

[0027] Step S102, performing normalization processing on the amplitude of the...

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Abstract

The invention discloses a sine wave parameter measuring method and system in an electric power system. The sine wave parameter measuring method in the electric power system comprises sampling a sine wave signal and obtaining a sampling data sequence according to the preset signal time duration and a preset signal discrete sampling frequency; normalizing an amplitude of the sampling data sequence and generating into a sine wave signal sequence with the normalized amplitude; selecting two discrete signals being at a nearest starting zero crossing point distance from the sine wave signal sequence and two discrete signals being at a nearest finishing zero crossing point distance from the sine wave signal; converting sampling values of the selected four discrete signals into a period of the sine wave signal through a preset period calculation model; converting the period of the sine wave signal into the sine wave signal frequency. The sine wave parameter measuring method and system in the electric power system can rapidly and stably detect the sine wave signal frequency with high accuracy.

Description

technical field [0001] The invention relates to the field of electric power technology, in particular to a method and system for measuring parameters of sine wave signals in a power system. Background technique [0002] In the practice of modern power engineering, the development of high-precision power instruments and the application of a large number of new technologies in the power system have higher and higher requirements for the measurement accuracy of signal frequency. A common method for measuring the frequency of low-frequency signals is a zero-crossing algorithm. This method calculates the frequency of the waveform by detecting the zero-crossing point of the signal waveform and using the time interval of one or several cycles of the zero-crossing point. [0003] However, the accuracy of the frequency value obtained by measuring the frequency of the low-frequency signal is low, and it is difficult to be applied in a power system including high-precision power instr...

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Application Information

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IPC IPC(8): G01R23/06
Inventor 李军庞志强万文军史玲玲任娟娟
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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