Power signal frequency detection method and system based on cosine function modulation
A power signal and cosine function technology, applied in the field of electric power, can solve problems such as poor anti-harmonic and noise interference, spectrum leakage, and low measurement accuracy, so as to improve anti-harmonic and noise interference, improve accuracy, and accuracy high effect
Active Publication Date: 2018-05-04
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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[0052] 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.
[0053] Such as figure 1As shown, a power signal frequency detection method modulated according to a cosine function, comprising steps:
[0054] 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;
[0055] 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;
[0056] 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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The invention relates to a power signal frequency detection method and system based on cosine function modulation. The present invention uses cosine function modulation for a signal sequence with a relatively large initial phase change range to obtain a cosine function modulation sequence with zero initial phase or an initial phase near zero. The cosine function modulation sequence avoids the influence of the problem of a large initial phase change range, and at the same time, the cosine function modulation sequence carries the full phase difference information of the signal sequence with a large value, which can significantly improve the accuracy of power signal frequency calculation and improve Anti-harmonic and noise interference. The frequency accuracy of the power signal obtained by the present invention can reach the order of 10-10, and the accuracy of frequency calculation is relatively high.
Description
technical field [0001] The invention relates to the field of electric power technology, in particular to a power signal frequency detection method modulated according to a cosine function and a power signal frequency detection system modulated according to a 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 methods, such as ...
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IPC IPC(8): G01R25/00
Inventor 李军陈世和潘凤萍李锋
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID