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Method and system for zero initial phase cosine function modulation of power signal sequence

A power signal and cosine function technology, applied in the power field, can solve the problems of spectrum leakage, poor anti-harmonic and noise interference, and low measurement accuracy, and achieve the effect of improving anti-harmonic and noise interference and improving accuracy.

Active Publication Date: 2018-07-06
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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Problems solved by technology

Due to the limitations of actual signal processing technology and the complexity of signal composition, such as the influence of data quantization background noise caused by discrete sampling of signals, the problem of spectrum leakage caused by signal sequence truncation is objectively unavoidable, the influence of arbitrary initial phase problems of signals, and the The impact of DC and sub-harmonics and sub-harmonic problems, etc., the measurement accuracy of these algorithms is also low, and the anti-harmonic and noise interference are poor

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  • Method and system for zero initial phase cosine function modulation of power signal sequence
  • Method and system for zero initial phase cosine function modulation of power signal sequence
  • Method and system for zero initial phase cosine function modulation of power signal sequence

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[0028] In order to better understand the technical problems to be solved by the present invention, the technical solutions adopted and the technical effects achieved, the specific implementation manners of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0029] Such as figure 1 As shown, a method for zero initial phase cosine function modulation of a power signal sequence includes steps:

[0030] S101. Obtain a preliminary sampling sequence length according to the lower limit of the power signal frequency range, the preset sampling frequency and the preset integer signal cycle number;

[0031] S102. Preliminarily sample the power signal according to the length of the preliminary sampling sequence, and obtain a preliminary sampling sequence of the power signal;

[0032] S103. Perform a preliminary frequency measurement on the preliminary sampling sequence, acquire a preliminary frequency of the power signal, and determine...

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Abstract

The invention relates to a method and system for conducting zero initial phase cosine function modulation on an electric power signal sequence. A forward sequence and an inverse sequence are obtained through a series of operations and added, and the electric power signal sequence is modulated to be a cosine function modulation sequence near the zero of a zero initial phase or an initial phase within the large variation range of the initial phase of the electrical signal sequence. According to the obtained cosine function modulation sequence, the influence of large changes of the initial phase of the signal sequence is avoided, meanwhile, the cosine function modulation sequence carries full-phase difference information of the signal frequency with the large value, the accuracy of sine parameter measurement can be remarkably improved, and harmonic resistance and noise interference resistance are improved.

Description

technical field [0001] The invention relates to the field of electric power technology, in particular to a method for modulating a power signal sequence with a zero initial phase cosine function and a system for modulating a power signal sequence with a zero initial phase cosine function. Background technique [0002] The measurement of the sinusoidal parameters of the power system includes frequency measurement, phase measurement, amplitude measurement and so on. 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 parameter measurement technology, the problems of Fourier transform become more and more prominent, and it is difficult to further meet the requirements of high-accuracy calculation of sinusoidal parameters in power systems. [0003] In terms of sinusoidal parameter measurement of power system, there are some improved parameter measurement met...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R23/16G01R31/00
Inventor 李军陈世和万文军罗嘉庞志强
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID